Dipolar Complexes Research Articles

Ferroelectric properties of vanadium substituted four-layer Aurivillius compound Bi5Fe1.5V0.5Ti2O15 thin films

We report the preparation and characterization of vanadium substituted four-layer Aurivillius compound Bi5Fe1.5V0.5Ti2O15 using spin coating method. Ferroelectricity in the prepared films are confirmed from the well saturated polarization vs electric field (P-E) loops having remnant polarization (2 Pr) around 12.94 µC/cm2 at room temperature. In addition, low temperature P-E measurements show a decrease in Pmax and 2 Pr, which is attributed to the stabilization of defect dipole complexes and domain pinning, as seen in bismuth-based ferroelectrics. Additionally, this decrease in polarization is accompanied by an increase in imprint, confirming the presence of defect dipoles manifested as internal fields.

Catalyst- and solvent-free regiospecific SNHAr phosphinylation of pyridines with H-phosphinates mediated by benzoylphenylacetylene.

Pyridines undergo a facile SNHAr phosphinylation with H-phosphinates under catalyst- and solvent-free conditions (50-55 °C) in the presence of benzoylphenylacetylene to afford 4-phosphinylpyridines in up to 68% yield. In this reaction, benzoylphenylacetylene activates the pyridine ring by the formation of a 1,3(4)-dipolar complex, deprotonates H-phosphinates to generate P-centered anions and finally acts as an oxidizer, being eliminated from an intermediate ion pair. Terminal electron-deficient acetylenes (methyl propiolate and benzoylacetylene) are inefficient as mediators in the above SNHAr process.

Rejuvenation of giant electrostrain in doped barium titanate single crystals

Engineering materials through the introduction of point defects has resulted in significant advances in semiconductor processing and, more recently, the observation of novel phenomena such as large reconfigurable strains in ferroelectrics as a result of defect dipole complexes. Up to 0.8% strain has been demonstrated in BaTiO3 crystals dilutely doped with iron. However, the defect dipole pinning sites and the corresponding achievable strains are found to degrade as the crystal is electrically cycled as part of the measurement process. The strain degradation rate is dependent on the applied field values but shows an exponential change in materials properties regardless of the electric field. This behavior, plus a change in impedance with number of times cycled, suggests these changes are due to electric field induced oxygen migration—similar to the cause of the resistance degradation effect. Despite this, effective piezoelectric coefficients of over 4700 pm/V were recorded with 1.5 kV/cm fields, one of the largest values for a lead-free piezoelectric material thus far. In addition, the defect dipole-aligned state and the high strains can be repeatably recovered by a subsequent heat treatment step after cycling. Potential paths to exploiting the defect dipole induced effects and large piezoelectric coefficient in these dilutely doped systems are proposed.

Quantized topological charges of ferroelectric skyrmions in two-dimensional multiferroic materials

In multiferroic materials, the microscopic magnetic and electric textures are strongly correlated with each other by magnetoelectric (ME) coupling. Therefore, topological electric dipole textures, such as ferroelectric (FE) dipole skyrmions and periodic FE dipole crystals, are expected to be induced if ferromagnetic (FM) skyrmions and FM skyrmionic crystals (or lattices so as to be abbreviated as SLs for convenience) can be stabilized. In the present work, a quantum computational approach is utilized to simulate the topological textures of FE SLs in a two-dimensional (2D) multiferroic system. Consequently, we find that, FE SLs can indeed be induced once the FM SLs are formed; each FE skyrmion is an ferroelectric dipolar complex formed around an FM skyrmion; the topological charges of these FE skyrmions are usually quantized to be integers, half integers and multiples of certain fractional values, so that the FE SL coincides precisely with the corresponding FM SL; the topological charge density of each FE SL also forms periodic pattern; and a normally applied electric field is able to change the sizes of FM skyrmions, elevate their formation temperatures, and destroy FM SLs below the critical temperatures.

Mechanisms of radiation defect formation in KCl crystals under the influence of local and plastic deformation

This work proposes an original approach to the study of trihalide centers in a KCl matrix in the field of local and plastic deformation. Local lattice deformation is carried out by purposeful doping of the KCl crystal with light homologous cations, as well as bivalent impurities, which create dipole strontium complexes to maintain the electroneutrality of the lattice. Plastic deformation, which creates paired vacancy defects in the lattice, divacancies and vacancy quartets, is realized at room temperature within the degree of relative uniaxial deformation of 3–5%. After subsequent cooling down to 80 K the deformed crystal was additionally irradiated with X-rays. The absorption spectra of the crystals subjected to two types of deformation and additional isodose irradiation by X-rays were recorded in a special cryostat at 80 K. The spectral characteristics and formation efficiency of V-type centers, lithium- and strontium-containing centers in the field of pre-irradiation dipole complexes have been considered.

Compositional modulation and annealing treatment in BaTiO3 to simultaneously achieve colossal permittivity, low dielectric loss, and high thermal stability

Holmium doped BaTiO3 ceramics were prepared by a solid-state reaction. Colossal dielectric permittivity (≥105) and a very low loss tangent (<1.5%) at 10 kHz were achieved. Furthermore, the ceramics exhibit excellent temperature stability with a broad operating temperature range (25–400 °C). The evolution of the concentrations of oxygen vacancies and reduced Ti3+ was estimated by the XPS. Defect dipole complexes, coupled between the negatively and positively charged defects, are responsible for the observed huge dielectric permittivity. Temperature dependence of dc conductivity demonstrates that the stability of the defect dipole complexes matches the temperature range of stable dielectric properties. The result bridges a relationship between defect dipoles and dielectric behavior to understand the huge permittivity response and low loss mechanism.

Dielectric polarization and relaxation processes of the lithium-ion conducting PEO/PVDF blend matrix-based electrolytes: effect of TiO2 nanofiller

The effect of TiO2 nanofiller concentration on the dielectric polarization and relaxation processes of (75PEO/25PVDF)/25 wt% LiClO4–x wt% TiO2 (x = 0, 2, 5, 10, 15, and 20) compositions based nanocomposite solid polymer electrolyte (NSPE) films has been investigated by employing the dielectric relaxation spectroscopy. The SEM micrographs demonstrate that the dispersion of TiO2 nanoparticles enormously alters the spherulitic morphology with the development of some cracks, pores, and wrinkles of these solution-cast prepared NSPE films. The X-ray diffraction study confirms that the heterostructures of these NSPE materials are semicrystalline and their degree of crystallinity increases irregularly with the increase of TiO2 concentration, however the crystallinity of host polymer blend matrix of these electrolytes decreases. The complex dielectric permittivity spectra of these NSPE materials in the frequency range from 20 Hz to 1 MHz at 27 °C reveal that there is a dominant contribution of electrode polarization and interfacial polarization at lower frequencies, whereas the high frequency permittivity values attribute to dipolar and ionic polarizations. Four types of relaxation processes have been probed by the ‘master curve representation’ of the dielectric and electrical spectra of these solid ion–dipole complexes. It is observed that the addition of TiO2 nanoparticles up to 10 wt% in these electrolytes influences the dielectric properties anomalously, but a huge decrease in the dielectric polarization and increase in the relaxation times are noted resulting in a significant decrease in the ionic conductivity of the film at 20 wt% TiO2 concentration. The dependence of dc ionic conductivity of these lithium-ion conducting NSPE materials on the chain segmental relaxation time and also the degree of crystallinity has been explored. The results of these NSPE materials have also been compared with the TiO2 nanoparticles loaded different polymer matrices and salts based electrolytes and discussed appropriately. These lithium-ion based electrolyte films are accredited for the solid-state ion-conducting energy storing devices from their electrochemical parameters characterized by LSV, CV, and CA techniques.

Reorientation of Eu2+-cation vacancy dipolar complex in KCl/KBr binary crystals

In this work we describe the polarization and depolarization process of Eu2+–VC dipoles in Eu2+ doped solid solutions of KCl and KBr considering in detail the different jumping paths of the cation vacancy within individual arrangements of minority anions on the first two anion shells surrounding the dipolar complex. Experimental depolarization curves of binary crystals show in contrast to the single depolarization peak in unitary crystals, up to at least two additional depolarization peaks. These two additional peaks are associated with jumps perturbed by one, and two minority anions flanking the jumping path. In crystals for which Cl− is the minority anion, the formation of the two additional bands is more prominent than for those where Br− is the minority anion, suggesting that the divalent cation dopant has more affinity towards the Cl− minority anion than towards the Br− minority anion. Fittings of our model to the experimental data in which we also contemplate different affinities with the divalent dopant cation for Cl− and Br− minority ions, confirm this. In contrast to an earlier work, in which it had been suggested that only the first anion shell contributes to the perturbation of the dipole in order to reconcile the experimentally observed peak intensities and the supposed affinity between the dipole and the Cl− minority anion, the results of our work suggest that both shells contribute in a similar way. This discrepancy is discussed in terms of the different approaches to the description of depolarization process.

Versatile and Tunable Electrical Properties of Doped Nonoxidized Graphene Using Alkali Metal Chlorides.

With the rapid development of wearable and flexible electronics, graphene has been intensively studied for the transparent, hole transport electrode layer (HTL) of field-effect transistors, light-emitting diodes, and organic photovoltaic (OPV) cells. To modulate the sheet resistance and the work function of graphene as a HTL, the surface doping is versatile while retaining high transparency. In this work, we used a chemical doping method to control the charge carrier density, band gap, and work function of graphene with minimizing the damage of the carbon network, for which metal chlorides (NaCl, KCl, and AuCl3) were used as chemical dopants. The high-quality graphene flakes were synthesized with large lateral sizes of more than 5 μm using ternary graphite intercalation compounds. Interestingly, the AuCl3-doped graphene flake film with a film thickness of about 20 nm showed the lowest reported sheet resistance of ∼249 Ω/sq with ∼75% transmittance. Furthermore, it could control the work function from 4.32 to 5.1 eV. The interfacial dipole complexes of metal cations with a low work function and the reactive radicals such as -OH were discussed to explain this result. For the practical application, an OPV device using the AuCl3-doped graphene flake film as the HTL was fabricated and it demonstrated enhanced power conversion efficiency while maintaining high optical transparency in visible light.

Multifunctional behavior of acceptor-cation substitution at higher doping concentration in PZT ceramics

Abstract The Fe-doped PZT, Pb (Zr, Ti)1-xFexO3, ceramics have gathered plenty of attention because of the interplay of ferroelectric and ferromagnetic properties. In the present study, we report the properties of Pb(Zr0.52Ti0.48)1-xFexO3 prepared by conventional solid-state reaction route with varying Fe3+ doping concentrations, x = 0, 0.05, 0.10, 0.15 and 0.20. Study of X-ray diffraction patterns confirmed the tetragonal crystal structure along with reduction in tetragonality and unit-cell size with doping. It also showed formation of secondary magneto-plumbite phase at higher doping concentrations. The SEM micrographs exhibited decrease in grain size with increase in doping concentration (for x > 0.05). The increase in oxygen vacancies and the formation of secondary magneto-plumbite phase and Fe3+–VO2−–Fe3+ defect dipole complexes introduced with the acceptor (Fe3+) doping, caused clamping of the domain walls and hence reduced the room temperature dielectric constant as the doping concentration was increased. The coexistence of electrical polarization and magnetic moment at room temperature in all PFZT compositions confirmed the multiferroic characteristic in the ceramic samples. Electric polarization (Pr) and coercive fields (Ec) decreased with increase in Fe3+ concentration in PFZT sample. However, magnetization (M) and magnetic coercive fields (Ec) increased with the increasing Fe3+ concentration due to the dominant effect of F-center exchange mechanism in Fe3+–VO2−–Fe3+ and formation of ferromagnetic secondary magneto-plumbite phase.

Effectively improved ionic conductivity of montmorillonite clay nanoplatelets incorporated nanocomposite solid polymer electrolytes for lithium ion-conducting devices

Synergistic effects of lithium salt concentration and inorganic nanofiller incorporation on the ionic conductivity of polymer blend matrix based nanocomposite solid polymer electrolytes (NSPEs) have been examined. The montmorillonite (MMT) clay nanoplatelets incorporated NSPE films based on poly(ethylene oxide) and poly(methyl methacrylate) blend matrix with lithium tetrafluoroborate (LiBF4) ionic salt have been prepared by the solution-cast method followed by melt-press technique. The 1, 3, and 5 wt% MMT amounts along with 13.3 wt% LiBF4 amount as compared to the weight of polymer blend have been used for the preparation of NSPE films. X-ray diffractometer (XRD) and the Fourier transform infrared (FTIR) spectrometer have been employed for structural characterization of these NSPE films. The complex permittivity and ac electrical conductivity spectra are investigated by using the dielectric relaxation spectroscopy, whereas the electrochemical performance of these materials has been characterized by the electrochemical analyzer. The XRD patterns reveal that the NSPEs are predominantly amorphous and have the intercalated and exfoliated MMT platelets, whereas the relative changes in their FTIR spectra confirm the ion–dipolar–nanofiller interactions between the functional groups of the blended polymers, lithium ions, and the MMT nanoplatelets. The permittivity and conductivity spectra of these materials are analyzed for exploring the dominant contribution of electrode polarization and dipolar polarization in the low and high frequency regions, respectively, and the presence of relaxation processes associated with structural dynamics of the solid-state ion–dipolar complexes. It has been found that the NSPE of relatively fast polymer chain segmental dynamics exhibits higher ionic conductivity. The room temperature ionic conductivity of the 13.3 wt% LiBF4 containing SPE is found more than two times higher as compared to that of the SPE film having 9.7 wt% LiBF4. When the MMT is incorporated, the ionic conductivity of 13.3 wt% LiBF4 containing NSPEs enhances by about one order of magnitude at room temperature. The dc ionic conductivity of the 13.3 wt% LiBF4 containing SPE film is found 1 × 10–5 S/cm at 55 °C, whereas it is 1.65 × 10–5 S/cm at 27 °C for the 5 wt% MMT incorporated NSPE film. The significantly enhanced ionic conductivity with ions transference number close to unity, high electrochemical stability voltage window and good reversibility of these NSPE materials confirm their potential applications as ion conductor/separator for the development of all-solid-state ion conducting devices and the lithium-ion batteries.

Zinc(II) as a Versatile Template for Efficient Dipolar and Octupolar Second-Order Nonlinear Optical Molecular Materials §

This short review outlines the main results obtained in the field of molecular materials based on zinc coordination compounds for second-order nonlinear optics. It presents an overview of the main classes of second-order nonlinear optical (NLO) active complexes bearing monodentate, bidentate, tridentate, or tetradentate π-delocalized ligands such as substituted stilbazoles, bipyridines, phenanthrolines, terpyridines, and Schiff bases. Macrocyclic ligands such as porphyrins and phthalocyanines are not covered. This paper shows how coordination to the Zn(II) center of π-delocalized nitrogen donor ligands produces a significant enhancement of their quadratic hyperpolarizability. Dipolar complexes are mainly presented, but octupolar zinc complexes are also presented. The coverage is mainly focused on NLO properties that are measured at the molecular level, working in solution, by means of the electric field-induced second harmonic generation (EFISH) or the hyper-Rayleigh scattering (HRS) techniques.

X-ray-induced colouring kinetics of (Ba2+, Eu2+)-doubly doped KCl single crystals: influence of the different aggregation–precipitation states of the doping ions

ABSTRACTThe effects of different aggregation–precipitation states of the doping Ba2+-ion on the X-ray-induced generation of F-centres in KCl:Ba2+(675 ppm):Eu2+(27 ppm) single crystals was investigated by optical absorption spectrophotometry. Such states were induced to occur in a controlled manner by subjecting the crystals to suitable thermal treatments. During these treatments, the aggregation–precipitation kinetics of the doping Ba2+-ions was monitored, by optical fluorescence spectrophotometry, utilising the doping Eu2+-ion as an optical probe. As dissolved into the host matrix as forming part of impurity–vacancy (I–V) dipole complexes and small aggregates, divalent barium increases the initial F-colouring rate and F-centre solubility limit by impressive factors of 2 ± 1 and 3 ± 1, respectively, in relation to those of a non-doped crystal. As a constituent of incipient metastable BaCl2-type second-phase precipitates, divalent barium reduces the initial F-colouring rate and F-centre concentration at which the second colouring stage begins by factors of 0.6 ± 0.1 and 0.8 ± 0.1, respectively, in relation to those of the crystal containing barium I–V dipole complexes and small aggregates. As forming part of stable BaCl2 second-phase precipitates and large metastable BaCl2-type second-phase precipitates, divalent barium modifies such a rate and concentration by factors of 1.4 ± 0.1 and 0.7 ± 0.1, respectively, in relation to those of the crystal containing incipient metastable BaCl2-type second-phase precipitates. Also, the doping with divalent barium disrupts the equilibrium between the generation and extinction of F-centres that exists characteristically during the F-curve second colouring stage in a non-doped KCl crystal so that such a rate increases as the aggregation–precipitation phenomena occur within the host matrix. This rate is 0.08 ± (0.08, 0.07), 0.10 ± 0.06 and 0.22 ± (0.05, 0.08) cm–1/h for crystals containing the divalent barium in the form of I–V dipole complexes and small aggregates, incipient precipitates of the metastable BaCl2-type second phase, and large precipitates of both the metastable BaCl2-type second phase and the stable BaCl2 second phase, respectively. The structural mechanisms that are behind the observed effects are discussed.

Influence of solid polymer electrolyte preparation methods on the performance of (PEO–PMMA)–LiBF4 films for lithium-ion battery applications

Classical solution-cast and ultrasonic–microwave-irradiated solution-cast methods have been used for the preparation of solid polymer electrolyte (SPE) films comprising polymer matrix of poly(ethylene oxide) and poly(methyl methacrylate) blend and lithium tetrafluoroborate (LiBF4) ionic salt. These films have been characterized by employing the X-ray diffraction, Fourier transform infrared spectroscopy, dielectric relaxation spectroscopy, and electrochemical analyser. It is observed that the temperature-dependent ionic conductivity of these predominantly amorphous solid ion–dipolar complexes is governed by their dielectric permittivity and the relaxation times of various dynamical processes. The relaxation times and the dc ionic conductivity of these electrolyte materials obey the Arrhenius behaviour, whereas the normalized ac conductivity exhibits the time–temperature superposition scaling. The influence of sample preparation methods on the performance of SPE films and the suitability of these materials for the lithium-ion batteries has been explored by noting the relative changes in their structural, dielectric, electrical, ionic conductivity, and the electrochemical parameters.

Infrared Spectroscopic and Electronic Structure Investigations of Beryllium Halide Molecules, Cations, and Anions in Noble Gas Matrices.

Laser-ablated Be atoms, cations, and electrons were reacted with F2, ClF, Cl2, NF3, CCl4, CF2Cl2, HCl, DCl, and SiCl4 diluted in noble gases. The major products were the dihalides BeF2, BeClF, BeCl2, and the hydride chloride HBeCl, whose identities were confirmed by comparison with previous evaporative work, deuterium substitution, and vibrational frequency calculations. The matrix-isolated fundamental frequency of the BeF molecule is higher, and the frequency of BeCl is lower, than that determined for the gas-phase molecules. The BeF+ and BeCl+ cations formed strong dipole-induced dipole complexes in solid Ne, Ar, Kr, and Xe with stepwise increase in computed noble gas dissociation energies. Going down the family NgBeF+ and NgBeCl+ series (Ng = Ne, Ar, Kr, Xe) the Mulliken charges q(Be) decrease, while q(Ng) increases, and the dipole moments decrease, which suggests covalent bonding in the xenon species. We find that the largest intramatrix shift is Ne to Ar which follows the largest factor increase for the Ng atomic polarizabilities. Extra electrons produce Cl-, which reacts with HCl to form the stable HCl2- anion and possibly with BeCl2 to give BeCl3-. A weak band observed in neon experiments with F2 is probably due to BeF3-.

Point defect engineering of high temperature piezoelectric BiScO3–PbTiO3 for high power operation

BiScO3–PbTiO3 is used as a model system of BiMO3–PbTiO3 perovskite solid solutions with enhanced electromechanical response at ferroelectric morphotropic phase boundaries, and high Curie temperature to demonstrate specific point defect engineering for high power operation. The objective is to obtain a range of piezoelectric ceramics comparable to hard Pb(Zr,Ti)O3 materials, optimized for the different applications. In this work, a comprehensive study of Mn substitution for Sc is provided. Care is taken to isolate the effects of the point defects from those of concomitant structural and microstructural changes that have been previously described after MnO2 addition. Results strongly suggest that Mn substitution results in the formation of (MnSc′-VO) dipolar complexes that effectively clamp domain walls. This is the same mechanism responsible of hardening in Pb(Zr,Ti)O3. Indeed, Bi0.36Pb0.64Sc0.36-x MnxTi0.64O3 with x=0.02 is shown to be a high sensitivity piezoelectric with strongly reduced losses, suitable for high power operation between 200 and 400°C.

Microstructures and electrical properties of BSTM multilayers with different periods

5% Mn-doped BST (BSTM) multilayers with different periods have been prepared by a chemical solution deposition method. The X-ray diffraction results showed that all of the multilayers exhibited a single perovskite phase, randomly oriented polycrystalline structure. The crystalline qualities improved as the number of periods was increased. The building block consisting of dense and porous BSTM bilayer was characterized and confirmed by transmission electron microscopy (TEM) and spectrometer analysis. Strong frequency dispersion of the dielectric properties was found for all BSTM multilayers. The behaviors of the dielectric losses at high (>450kHz) and low (<1kHz) frequencies are related to the extrinsic resonance and the conduction mechanisms, respectively. The dielectric loss peak in the mid-frequency range monotonically decreased with an increase in the number of periods, which was assumed to be attributed to the interactions between the induced space charge polarization and dipolar complexes.

Bi deficiency-tuned functionality in multiferroic Bi1-δFe0.95Mn0.05O3 films.

Structural evolution and ferroelectric (FE)-to-antiferroelectric (AFE) transition behaviors were observed in Bi1-δFe0.95Mn0.05O3 (100)-textured films with a carefully controlled Bi deficiency concentration δ. Raman spectra revealed an orthorhombic structural transition induced by Mn substitution. The polarization-electric field hysteresis loops and capacitance-voltage loops of Bi1-δFe0.95Mn0.05O3 films clearly demonstrated antiferroelectric behavior with increasing δ. The responses of the domain structure of the Bi1-δFe0.95Mn0.05O3 film under positive and negative applied voltages directly suggested the coexistence of FE and AFE phases. The existence of (100) superstructure reflections and antiparallel displacements of the Bi atoms along the [100] direction observed by transmission electron microscopy unambiguously reveal the AFE phase. The chemical substitution-induced orthorhombic structural transition in BiFe0.95Mn0.05O3 film implies that as the δ concentration increases, the changes in Bi-O bonding and the stereochemical activity of Bi 6s lone pair affect both the ferroelectric distortion and the antiferrodistortive rotation and therefore drive the Bi1-δFe0.95Mn0.05O3 crystal lattice to form a PbZrO3-type orthorhombic phase with an AFE order. A continuing increase in Bi deficiency creates defect dipole complexes which produce an internal field leading to a preferred direction of the ferroelectric domain. The Bi deficiency in multiferroic BiFeO3 provides a new route by which to tune functionality.

Relaxation behavior of oxygen vacancies in Sc-doped BaTiO3

The dielectric properties of the Ba(Ti1-x Sc x )O3-δ system have been studied as functions of the temperature and the frequency for x = 0.0005 to 0.05. The dielectric loss (tanδ) peak shifted to higher frequency with increasing Sc content, and the loss peak moved to higher frequency with increasing temperature, showing a thermally- activated process. Such a behavior was in good agreement with Debye’s equation. Two activation energies were estimated at Sc ≤ 1 mol% whereas a single activation energy was determined for x = 0.02 and 0.05 on the temperature range studied. At Sc ≤ 1 mol%, the activation energy at higher temperatures could be due to the dissociation of the defect complex (Sc’ Ti –V o) and to the swing motion of oxygen vacancies. The single activation energy at Sc ≥ 2 mol% implies that over the temperature range studied, the relaxation mechanism could be due to the reorientation of a dipolar complex without any oxygen vacancy dissociation.

Effects of ultrasonic assisted processing and clay nanofiller on dielectric properties and lithium ion transport mechanism of poly(methyl methacrylate) based plasticized polymer electrolytes

ABSTRACTLithium ion conducting solid polymer electrolyte (SPE) films consisted of poly(methyl methacrylate) (PMMA) matrix with lithium perchlorate as a dopant ionic salt, poly(ethylene glycol) as plasticizer and montmorillonite clay as inorganic nanofiller have been prepared by classical solution casting and high intensity ultrasonic assisted solution casting methods. The X‐ray diffraction study confirmed the amorphous structure of all these PMMA‐based solid electrolytes and the clay nanosheets existed in exfoliated form in their amorphous phase. Dielectric relaxation spectroscopy had been employed for the investigation of complex dielectric function, ac electrical conductivity, electric modulus, and impedance spectra of these electrolytes over the frequency range from 20 Hz to 1 MHz. It was observed that the dielectric properties and ionic conductivity of the electrolytes strongly depended on the sample preparation methods, and also had changes with addition of the clay nanofiller. Temperature‐dependent dielectric study of the electrolyte films confirmed that their dc ionic conductivity and conductivity relaxation time values obeyed the Arrhenius behavior. This study also revealed that the lithium ion transportation in the ion–dipolar complexes of these electrolytes occurred through hopping mechanism and it was correlated with the conductivity relaxation time. Preparation of these electrolyte films through ultrasonic assisted solution casting method increased the ionic conductivity by more than one order of magnitude in comparison to that of the classical solution casting method, which revealed that the former was a novel method for the preparation of these SPEs of relatively enhanced ionic conductivity. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015, 132, 42188.