Ray Diffractograms Research Articles

Zirconium doped zinc oxide thin films grown by spray pyrolysis technique for TCO applications

Zirconium (Zr) doped Zinc Oxide (ZnO) thin films were grown on pre-cleaned glass substrates by spray pyrolysis technique. The dopant was added in different concentrations to study its influence on the structural, optical, morphological, and electrical properties of ZnO thin films. X- Ray Diffractogram (XRD) data was used to study the structural properties of all the thin films. It was found that the crystallite size varied between 25 and 45 nm for dopant at different concentrations. Additionally, it was discovered that ZnO possessed a hexagonal wurtzite structure with (002) as its preferred orientation regardless of the doping doses. The optical properties for all the thin films were obtained by analysing the absorption spectra. The transmittance of all the thin films ranged between 65 % and 86 % in the visible range with 4 at % Zr doped ZnO having highest transmittance. Scanning Electron Microscopy (SEM) results showed the agglomeration of particles at higher concentrations of the dopant. Electrical studies showed that the resistivity of the doped samples decreased as compared to the pristine sample. Sample with 6 % of doping had the highest carrier concentration and hence, showed the least resistivity of 67 Ω cm.

Effect of microwave annealing on Tin Oxide nanomaterials

We herein reported SnO2 (Tin Oxide) nanoparticles (NPs) synthesis using microwave assisted method. Stannous Chloride is used as a source of Sn, pH level 8 was maintained throughout the reaction for one hour using liquid ammonia. Domestic microwave oven with frequency of 2.54 GHz was used to treat the precipitate. Microwave treatment with different power modes (High power, low power, and direct heating mode) was given to collected dried synthesized samples for 30 min duration. Synthesized nanoparticles were investigated using UV–Vis, XRD, and FTIR spectroscopy. Crystallite size obtained using Scherrer formula. Tetragonal Rutile crystal structure has been obtained in XRD investigation. Prominent existence of (110) and (101) reflection has been revealed in X ray diffractogram. Microstrain and dislocation density shows dependence on microwave power. Optical features are investigated using UV–Vis spectroscopy. Band gap shows variation upon increase in microwave power. Stretching band modes were investigated using FTIR spectroscopy. There are multiple advantages of microwave assisted method. Microwave assisted method is fast, cost effective as well as scalable method. Domestic Microwave was deployed for the purpose of nanoparticle synthesis. Various power modes available were used innovatively for reported synthesis.

Optical, structural and physical properties of fluoride doped bioactive glasses

Glasses of composition (60–x)NaPO3-25B2O3-xCaF2-15MgO, where x = 2.5, 5, 7.5, 10 and 12.5 mol% were synthesized by melt quench method at 1100 °C. The X ray diffractogram (XRD) of glass samples reveals their amorphous nature. Density of synthesized samples was found to increase when CaF2 composition varied from 2.5 to 12.5 mol%. UV visible absorption spectra of the samples show broad absorption band at nearly about 215 nm. The optical band gaps were estimated from the optical absorption spectra by using Tauc plots. An increase of band gap energies was observed due to the creation of ionic cross-links within the glass structure. The various other parameters like calcium ion concentration, polaron radius, internuclear distance and optical basicity values were calculated using the refractive index and density of glasses. For in vitro studies, the glasses were soaked in Simulated Body Fluid (SBF) solution for 14 days. The XRD and Infrared (IR) studies carried out on samples post immersion in SBF solution for 14 days have revealed the formation of hydroxyapatite layer.

Dynamic elastic modulus of modified cotton fibres

The dynamic elastic modulus of three cultivated varieties of G. hirsutum Linn, namely Samaru 26J Nigeria, Samaru 26J Glasgow and an unspecified American upland has been studied at different stages of fibre maturity using visco-elastomer. The dynamic modulus is found to be strongly dependent on both the maturity and the optical orientation angle. To eliminate the effect of convolutions on both the dynamic modulus and the helix angle, fibres are treated in liquid ammonia to get Cellulose III lattice structure and revert back to Cellulose I lattice structure using distilled water. Both the X- ray diffractograms and the scanning electron micrographs also confirm this finding. Maturity ratio is shown to have a very strong effect on the dynamic elastic modulus and not the age of the fibre. Fibres of similar maturity ratio show similar dynamic modulus, irrespective of the environmental conditions. Cellulose III and Cellulose I regenerated fibres have about the same dynamic modulus values. This shows that treatment does produce profound changes in the gross structure and calls for a fresh look at the swelling mechanism in both structures, a possible disruption of the H- bonding systems of cellulose by both treatments.

Investigations on fracture response of warm mix asphalt mixtures with Nano glass fibres and partially replaced RAP material

In the present research, an attempt was made to develop the mix design for a novel Warm Mix Asphalt (WMA) with Sasobit warm mix additive, Reclaimed Asphalt Pavement (RAP) based aggregates and Nano Glass Fibers (GF). Aggregate blends, as per Bailey’s gradation guidelines, were adopted to prepare asphalt mixtures with high RAP replacement of 70 % along with incremental proportions of GF, ranging from 0.2 % to 0.4 % with 0.1 % steps. Further, these specimens were tested and evaluated for their fracture properties. The mixtures with 70% RAP and 0.3% GF have exhibited 3.3 times the sustained peak load, 1.76 times the fracture energy and 1.8 times the critical strain energy release when compared with the reference asphalt concrete mixture, proving the efficacy of the modification being attempted during the present research. Further, this mixture was found to exhibit satisfactory performance with regard to the Tensile Strength Ratio (TSR), resilient modulus and the rut resistance. X Ray diffractograms (XRD) for the Sasobit blended binders have indicated a semi crystalline structure while the aging indices, derived from Fourier Transform Infrared Spectroscopy (FTIR), conducted on these binders, revealed improved aging resistance for the Sasobit blended binder.

Excellent flexible Tin Oxide-metal sulfide nanocomposites grown by spin coating chemical route

Tin oxide /Metal sulfide nanocomposites were synthesized using two step solution route. In the first step SnO2 gel were obtained followed by the next step of addition of precursor of cadmium and sulfide salts. Films were grown on cellulose flexible substrate using spin coating method. All the samples were analyzed using structural, morphological and optical characterizations. In X ray diffractograms, tetragonal rutile structure is observed with shift in peak towards lower angle due to tensile strain. SEM micrographs show that the ring like structure converted into flake like structures. AFM micrographs also confirm the ring like or porous film converted into flake. Photoluminescence spectra exhibits the intensity of SnO2-CdS decreases as compared to SnO2. Optical transmittance confirms the formation of nanocomposite due to additional band was observed in nanocomposites.

Local hardening of Raman phonons in BaxSr1−xTiO3 thin films deposited by r.f. sputtering

Thin films of nanometric order of a solid solution of barium-strontium titanate BaxSr1−xTiO3 (BSTO), in the entire 0 ≤ x ≤ 1 range, were deposited at 495 °C on quartz by RF reactive co-sputtering. The composition was controlled through the RF power (P) applied to the targets. X ray diffractograms (XRD) reveal that all the samples show the cubic perovskite crystalline structure. The percentage of elements (x) in the films were evaluated by usingof electron dispersion spectroscopy, also through the change of the (110) lattice interplanar spacing determination of BSTO by means of XRD patterns. Experimental data points of concentration of Ba (x) and Sr (1−x) as a function of P describe a symmetric sigmoidal curve. The average crystal size for the whole composition is around 20 nm as estimated from XRD data. Raman measurements in the 100–900 cm−1 range show that optic phonons experience local hardening in the x interval 0.6–0.8. Around this region of x it is, in general, expected in BSTO a crystalline cubic-tetragonal phase transition when is prepared at low substrates temperatures. Distortion of the unit cell is observed in that interval, which probably originates the local hardening of phonons.

Production, extraction and characterization of Chlorella vulgaris soluble polysaccharides and their applications in AgNPs biosynthesis and biostimulation of plant growth

Chlorella vulgaris, like a wide range of other microalgae, are able to grow mixotrophically. This maximizes its growth and production of polysaccharides (PS). The extracted polysaccharides have a complex monosaccharide composition (fructose, maltose, lactose and glucose), sulphate (210.65 ± 10.5 mg g−1 PS), uronic acids (171.97 ± 5.7 mg g−1 PS), total protein content (32.99 ± 2.1 mg g−1 PS), and total carbohydrate (495.44 ± 8.4 mg g−1 PS). Fourier Transform infrared spectroscopy (FT-IR) analysis of the extracted polysaccharides showed the presence of N–H, O–H, C–H, –CH3, >CH2, COO−1, S=O and the C=O functional groups. UV–Visible spectral analysis shows the presence of proteins, nucleic acids and chemical groups (ester, carbonyl, carboxyl and amine). Purified polysaccharides were light green in color and in a form of odorless powder. It was soluble in water but insoluble in other organic solvents. Thermogravimetric analysis demonstrates that Chlorella vulgaris soluble polysaccharide is thermostable until 240°C and degradation occurs in three distinct phases. Differential scanning calorimetry (DSC) analysis showed the characteristic exothermic transition of Chlorella vulgaris soluble polysaccharides with crystallization temperature peaks at 144.1°C, 162.3°C and 227.7°C. The X–ray diffractogram illustrated the semicrystalline nature of these polysaccharides. Silver nanoparticles (AgNPs) had been biosynthesized using a solution of Chlorella vulgaris soluble polysaccharides. The pale green color solution of soluble polysaccharides was turned brown when it was incubated for 24 hours with 100 mM silver nitrate in the dark, it showed peak maximum located at 430 nm. FT-IR analysis for the biosynthesized AgNPs reported the presence of carbonyl, –CH3, >CH2, C–H,–OH and –NH functional groups. Scanning and transmission electron microscopy show that AgNPs have spherical shape with an average particle size of 5.76. Energy-dispersive X-ray (EDX) analysis showed the dominance of silver. The biosynthesized silver nanoparticles were tested for its antimicrobial activity and have positive effects against Bacillus sp., Erwinia sp., Candida sp. Priming seeds of Triticum vulgare and Phaseolus vulgaris with polysaccharides solutions (3 and 5 mg mL−1) resulted in significant enhancement of seedling growth. Increased root length, leaf area, shoot length, photosynthetic pigments, protein content, carbohydrate content, fresh and dry biomass were observed, in addition these growth increments may be attributed to the increase of antioxidant activities.

Efficiency enhancement of dye-sensitized solar cell based gel polymer electrolytes using Poly(vinyl butyral-co-vinyl alcohol-co-vinyl acetate)/tetrapropylammonium iodide

Due to liquid electrolyte limitation in dye sensitized solar cells (DSSCs), GPEs were prepared and optimized. Poly(vinyl butyral-co-vinyl alcohol-co-vinyl acetate), P(VB-co-VA-co-VAc) acted as host polymer and tetrapropylammonium iodide, TPAI as dopant salt. The prepared gel polymer electrolytes (GPEs) with different TPAI salt content were characterized using electrochemical impedance spectroscopy, Fourier transform infrared spectroscopy and X ray diffractogram. An optimum ionic conductivity of 1.93 mS cm−1 was obtained with 40 wt% of TPAI salt added along with the lowest activation energy of 0.064 eV. Temperature dependence ionic conductivity behaviour of GPEs were studied and found that the systems obeyed the Arrhenius behaviour in the temperature range of 303–373 K. The dielectric results studies showed typical behaviour of both ε′ and ε′′ inversely proportional to frequency and directly proportional to temperature. Structural studies of GPEs were performed using XRD and FTIR and confirmed the existence of complexation of P(VB-co-VA-co-VAc) and TPAI salt. GPEs were used to assemble dye sensitized solar cells (DSSCs). The power conversion efficiency of 4.615% achieved with a maximum short circuit current density (Jsc) of 13.585 mA cm−2, open circuit voltage (Voc) of 0.678 V and fill factor of 50.1% at 40 wt% TPAI salt under A.M 1.5 (100 mW cm−2) illumination.

Impact of activator incorporation on red emitting rods of ZnGa2O4:Cr3+ phosphor

Chromium doped zinc gallium oxide (ZnGa2O4:Cr3+) microrods were synthesized by simple solid state reaction method. The transformation on crystal structure and optical properties with molar concentration of Cr3+ were analyzed. The cubic spinel nature of ZnGa2O4:Cr3+phosphor and their crystalline nature were confirmed from x- ray diffractogram. The average grain size of the samples range between 24 and 29 nm, with lattice parameter values greater than that of bulk. Lattice strain produced in the lattice on doping was estimated from the Williamson–Hall plot. It increases on Cr3+ doping up to 3 mol% and then decreases. Rod like nature of zinc gallate was observed from the surface morphological analysis using SEM. X-ray photoelectron spectroscopy was used for the chemical state identification of the constituent elements in the compound. The photoluminescense spectra consists of various emission lines originated from the chromium ion in the spinel lattice. The purity of red emissions were observed from chromaticity diagram with a concentration quenching initiated from the dipole–dipole interaction, with increase in dopant concentration. Band gap of the samples were estimated using Kubelka-Munk equation which exhibited red shift compared to bulk due to band tailing effect.

Nickel hexacyanoferrate supported at nickel nanoparticles for voltammetric determination of rifampicin

A rapid and simple method for voltammetric determination of rifampicin (RIF) using a glassy carbon electrode (GCE) modified with nanostructured nickel hexacyanoferrate (NiHCF) was developed. The sensor was prepared through an unusual method to NiHCF electrosynthesis, starting from nickel nanoparticles previously deposited on the surface of different electrodes (glassy carbon, ITO and gold electrode) under potentiodynamic conditions. X ray diffractograms of Ni nanoparticles thin film were obtained for different stages of NiHCF films formation indicating a homogeneous distribution throughout the substrate with a mean size around 40 nm and an irregular shape. EQCM studies showed that the nature of cations can promote strong alterations on the voltammetric and microgravimetric profile during the growth of NiHCF due to the ion transport mechanisms of redox reactions. Both voltammetric and microgravimetric behavior were studied in the presence of sodium, lithium and potassium ions and the best responses were found using potassium ions as supporting electrolyte. The presence of RIF promoted a decrease in the cathodic peak current of NiHCF, suggesting an interaction between the antibiotic and Ni species presented at the electrode surface. The variation in the current signal was proportional to the RIF concentration and it was adopted for its quantification, allowing the construction of a linear analytical curve from 5.0 × 10−6 to 5.0 × 10−4 mol L−1 with a limit of detection of 2.6 μmol L−1. The method was successfully applied for RIF determination in simulated human urine samples with good agreement between the added and recovery values.

XRD and EBSD Measurements of Directional Solidification Fe-C Eutectic Alloy

Abstract In a vacuum Bridgman-type furnace, under an argon atmosphere, directionally solidified sample of Fe - C alloy was produced. The pulling rate was v = 83 μm/s (300 mm/h) and constant temperature gradient G = 33,5 K/mm. The microstructure of the sample was examined on the longitudinal section using an Optical Microscope and Scanning Electron Microscope. The X-ray diffraction and electron backscatter diffraction technique (EBSD) have been used for the crystallographic analysis of carbide particles in carbide eutectic. The X-ray diffraction was made parallel and perpendicular to the axis of the goniometer. The EBSD shows the existence of iron carbide Fe3C with orthorhombic and hexagonal structure. Rapid solidification may cause a deformation of the lattice plane which is indicated by different values of the lattice parameters. Such deformation could also be the result of directional solidification. Not all of the peaks in X–ray diffractograms were identified. They may come from other iron carbides. These unrecognized peaks may also be a result of the residual impurity of alloy.

Influence of MMT nanoclay on impedance spectroscopy analysis of naturally woven coconut sheath/polyester hybrid composite

AbstractIn this work, the impedance spectroscopy study has been carried out for the naturally woven coconut sheath fiber reinforced composite with the effect of adding different weight percentages of montmorillonite nanoclay and chemical activation of fiber. The dispersion mechanism of nanoclay with polyester, and the modification of the fiber surface have been studied by using X–ray diffractogram, transmission electron microscope and scanning electron microscope respectively. Infra‐red spectra have also been taken to study the reactive compounds of treated fibers. The impedance spectrum shows significant improvement in A.C. conductivity, dielectric constant and loss tangent values by the fiber modification, using alkali and silane treatments, due to the structural topography changes at the fiber surface. The highest dielectric strength was found in alkali‐treated coconut sheath/polyester composite due to increase in orientation polarization by the absorption of moisture content at fiber surface. The addition of different weight percentages of nanoclay with coconut sheath in all the treated conditions shows significant changes in the dielectric properties. © 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013

Nanostructured OMO type Manganese Oxide – as Novel Support for Palladium towards Electrooxidation of Methanol and Ethylene Glycol

Octahedral molecular sieve type manganese oxide (OMO) was synthesized by the ultra sonic assisted hydrothermal method, and was subsequently used as supportive material for palladium (Pd) metal towards the electrooxidation of methanol and ethylene glycol. The Pd nanoparticles were coated on the OMO by insitu reduction method. Low quantity of 5% Pd metal was used and the electrocatalytic activity was studied. The prepared OMO and the OMO/Pd nanocomposite were characterized by powder X–ray diffractogram (XRD), Scanning Electron Microscopy (SEM), Energy dispersive X–ray spectroscopy (EDS) and electrochemical methods. These studies demonstrated that the OMO can act as a good catalyst supporting material. The OMO helps to enhance the catalytic activity of Pd metal by supplying the active oxygen, which is extracted from the electrolytic solution. The electrooxidation of EG shows improved catalytic activity.

Crystallization and electrical resistivity of Cu2O and CuO obtained by thermal oxidation of Cu thin films on SiO2/Si substrates

In this work, we study the crystallization and electrical resistivity of the formed oxides in a Cu/SiO2/Si thin film after thermal oxidation by ex-situ annealing at different temperatures up to 1000°C. Upon increasing the annealing temperature, from the X ray diffractogram the phase evolution Cu→Cu+Cu2O→Cu2O→Cu2O+CuO→CuO was detected. Pure Cu2O films are obtained at 200°C, whereas uniform CuO films without structural surface defects such as terraces, kinks, porosity or cracks are obtained in the temperature range 300–550°C. In both oxides, crystallization improves with annealing temperature. A resistivity phase diagram, which is obtained from the current–voltage response, is presented here. The resistivity was expected to increase linearly as a function of the annealing temperature due to evolution of oxides. However, anomalous decreases are observed at different temperatures ranges, this may be related to the improvement of the crystallization and crystallite size when the temperature increases.

Comparative studies of cobalt and nickel oxides synthesised using steady-state γ-radiolysis

The preparation of nano metal oxides of cobalt and nickel has been carried out by steady–state γ–radiolysis technique with aniline as a stabiliser and various alcohols as solvents. The UV–visible spectroscopy shows the progress of the reactions with sharp peaks observed in the range of 430–500 nm in cobalt solutions and nickel exhibiting peak in the range between 330 and 400 nm indicating the formation of Co3O4 and NiO respectively. X–ray diffractograms exhibit peaks that match with standards corresponding to the patterns of Co3O4 and Ni2O3 as the major phase. TEM shows the formation of fibres for cobalt oxide and beautiful spheres in case of nickel oxide. The fringe widths found out from HRTEM were seen to be ∼0.25 and 0.23 nm confirming the presence of respective oxides. The XPS studies depict the oxidation states with major peaks seen at ∼781.6 and 855.8 eV establishing the formation of Co3O4 and Ni2O3 respectively.

Synthesis of Zeolite Membrane (Y/α-Alumina)

The general aim of this study was to develop materials of the type: Y zeolite (hydrothermal synthesis), ceramic support (forming of powder) and zeolite membrane (rubbing). The preparation of the Y zeolite was conducted in accordance with the hydrothermal synthesis method, the time of crystallization was one day. The ceramic support was prepared by means of the forming of powder technique and subsequently subjected to sintering at a temperature of 1400°C/1h. The zeolite membrane (Y/α-alumina) was prepared by secondary growth method (rubbing). These materials were characterized by XRD and SEM. Obtaining Y zeolite could be confirmed by X ray diffractograms. From the images obtained by SEM, it was possible to derive from analysis that the Y zeolite is composed of a homogeneous morphology, where the particles are crowded, with uniform size. The results obtained for the ceramic support (α-alumina) showed that it displays characteristics peaks of aluminum oxide. By using micrographs it was possible to observe a heterogeneous microstructure with a compact form, without cracks upon the layers. According to the XRD, for the methodof secondary growth (rubbing), it was observed that the Y zeolite wich had been synthesized on the ceramic support displayed a crystalline structure. The micrography of the zeolite membrane (Y/α-alumina) showed the formation of a layer of zeolite on the ceramic support.

Mineralogia de partículas envolvidas na formação de gradiente textural em um argissolo subtropical

A presença de gradiente textural é comum e marcante em Argissolos. O objetivo do trabalho foi estudar a mineralogia das partículas envolvidas no processo de formação de gradiente textural em um solo subtropical do Rio Grande do Sul. Amostras de um Argissolo Vermelho-Amarelo distrófico abrúptico, material parental sedimentar, foram coletadas em duas trincheiras localizadas em distintas posições no relevo da área do departamento de solos da Universidade Federal de Santa Maria. No perfil 1, sob campo nativo e posicionado na meia encosta de uma colina com 9 % declividade, amostras foram coletadas nos horizontes A1, A2, AB e Bt. No perfil 2, sob vegetação espontânea e localizado no topo plano da colina, amostras foram coletadas nos horizontes A1, A2, E e Bt. Atributos químicos foram avaliados sobre a fração de solo menor que 2 mm. Amostras de argila dispersa em NaOH, após serem extraídas, foram submetidas à difração laser, discriminando a distribuição do tamanho de partícula envolvida no processo. A fração menor que 0,2 μm foi extraída, saturada com Ca2+ e submetida à difração de raios X sob os seguintes tratamentos: normal, à temperatura ambiente (N); depois de saturada com etilenoglicol (EG), depois de aquecida a 300 e 550 ºC. Os difratogramas de raios X (N) foram submetidos à modelagem matemática com DecompRX. Ambos os perfis apresentaram gradiente textural. Os teores de argila no horizonte Bt foram 2,9 e 4,4 vezes maiores no perfil 1 e 2 que nos seus respectivos horizontes mais arenosos. Os diagramas de difração laser mostraram enriquecimento no horizonte Bt em partículas de tamanho modal de 0,09 e 0,2 μm. A mineralogia dessa fração apresentou incremento nos horizontes Bt de interestratificados caulinita-esmectita (C-E) em detrimento das fases vermiculita hidróxi-Al entrecamada (VHE) e ilita-esmectita (I-E). Dessa forma, infere-se que o gradiente textural observado no solo está associado ao processo de migração de C-E com partículas de tamanho modal de 0,09 e 0,2 μm. Entretanto, o perfil 2 apresenta indícios de descontinuidade litológica, indicando que o processo de migração de partículas não é o único responsável pela formação de gradiente textural.

Characterization of defects in ZnO nanocrystals: Photoluminescence and positron annihilation spectroscopic studies

Defects present in ZnO nanocrystals prepared by a wet chemical method have been characterized by photoluminescence (PL) and positron annihilation spectroscopy (PAS) techniques. The as-prepared sample was heat treated at different temperatures to obtain nanocrystals in the size range of 19–39nm. X ray diffractograms confirmed the single-phase wurtzite structure formation. Photoluminescence measurements showed a strong violet band at 434nm, which has been identified as due to electronic transitions from the zinc interstitial defect level to the top of the valence band. A marked decrease in the intensity of the violet emission with increasing heat-treatment temperature has been observed, which is attributed to recombination of zinc interstitials with zinc vacancies. Positron annihilation spectroscopy has been employed to understand the dynamics of the vacancy-type defects and their annealing behavior. The observed variation of the defect related lifetime components with heat-treatment temperature has been successfully explained by using a three-state trapping model. The results of PL and PAS studies in the present case are found to be complementary to each other.

Miscibility in Blends of Isotactic/Syndiotactic Polystyrenes at Melt or Quenched Amorphous Solid State

AbstractSummary: Miscibility in amorphous phase and behavior in a crystalline phase of blends of two semicrystalline and isomeric polymers, isotactic polystyrene (iPS) and syndiotactic polystyrene (sPS), was probed. Optical and scanning electron microscopy results indicate no discernible heterogeneity in iPS/sPS blends in either melt state or rapidly quenched amorphous super‐cooled state, while the Tg behavior of the quenched amorphous blends shows an intimately mixed state of two polymer chains. The crystal forms of the blends were further analyzed to provide additional evidence of miscibility in the amorphous domain. The sPS in the iPS/sPS blends upon melt crystallization was found to predominantly exist as the more stable β‐form (rather than mixed β‐form and α‐form in neat sPS), which also suggests evidence of miscibility in the iPS/sPS blends. The melting behavior of semicrystalline sPS in the iPS/sPS mixtures was analyzed using the Flory‐Huggins approach for estimation of interactions. By measuring the equilibrium melting point of the higher‐melting sPS species in the sPS/iPS blends, a small negative value, for the interaction parameter (χ ≈ −0.11) was found. Further, by introducing a third polymer, poly(2,6‐dimethyl‐p‐phenylene oxide) (PPO), a ternary iPS/sPS/PPO blend system was also proven miscible, which constituted a further test for stable phase miscibility in the iPS/sPS blend. General nature of miscibility in blends composed of two crystalline isomeric polymers is discussed. Issues in dealing with blends of polymers of the same chemical repeat unit but different tacticities were addressed.X‐ray diffractograms for neat sPS and iPS/sPS blends, each having been isothermally crystallized at 245 °C for 4 h.magnified imageX‐ray diffractograms for neat sPS and iPS/sPS blends, each having been isothermally crystallized at 245 °C for 4 h.