High Electrostrictive Coefficient Research Articles

Electromechanical coupling in alkaline-earth doped-ceria ceramics

Oxygen-deficient cerium oxide ceramics exhibit an anomalously high electromechanical response called giant electrostriction. This feature has been linked to the polarization and reorganization of ionic defects, i.e., VO··, under an electric field. However, the exact mechanism and how it is related to intrinsic/extrinsic characteristics of doped ceria remains unclear. The present work investigates how alkaline-earth dopants with different defect–dopant interactions affect the overall electrochemical properties and defect chemistry and, ultimately, how these features impact the final electromechanical properties. We found higher dopant–defect associations attenuate the low-frequency relaxation of the electrostrictive coefficient. The defect chemistry is shown to be the main factor controlling the final electromechanical properties rather than defect concentration. All compositions show a similar electrostrictive response at high frequencies, indicating a common underlying mechanism. All samples showed a high electrostrictive coefficient (up to 3·10−17 m2/V2) and pseudo-piezoelectric response (32 pm/V).

Modified Re‐Entrant‐Like (K, Na)NbO3‐Based Relaxors with Superior Electrostrain Properties

AbstractPiezoceramics with large strain output, low hysteresis, and wide operation temperature are indispensable for the high‐end displacement control. Unfortunately, requiring these merits simultaneously remains a long‐standing challenge for lead‐free piezoceramics promising for replacing lead‐based ones. Herein a new strategy to resolve this challenge by developing modified re‐entrant‐like potassium sodium niobate ((K, Na)NbO3, KNN) relaxors is presented. Multi‐scale structural analysis reveals the presence of the significant local disorder, nano‐sized multi‐phase coexistence, and ultra‐fine grains, which facilitate the polarization rotation, effectively eliminate non‐180° domains, and erase polymorphic phase transition features in re‐entrant‐like KNN relaxors. Consequently, a combination of large strain (≈0.19%), ultra‐low hysteresis (<7%), high electrostriction coefficient (Q33 = 0.049 m4 C−2), and benign temperature stability (i.e., strain varies less than 10.6% within 30–120 °C) is realized, superior to other lead‐free relaxors. Therefore, this strategy provides a novel paradigm for designing high‐performance lead‐free piezoceramics used for high‐precision actuators.

Low-loss ferroelectricity in (Bi, Sn)-modified Na1−xBaxNb1−xTixO3 (x = 12.5%)

Na0.875Ba0.125Nb0.875Ti0.125O3 (NNBT) and Na0.875Ba0.11Bi0.01Nb0.875Ti0.11Sn0.0112O3 synthesized by solid-state technique exhibit P4bm symmetry. Dielectric-relaxations for NNBT show a transition to an antiferroelectric state below 449 °C (TC) with a prominent fall in the dielectric constant and the dielectric loss, like parent NaNbO3. Below 175 °C (TF) Ba, Ti-doping induced frequency-independent dielectric peak marks the ferroelectric phase. With 1.5% Bi, Sn-doping in NNBT, the grain size and the density of the ceramic increase. Bi, Sn-doped NNBT exhibits dielectric transitions at TC and a diffused TF but with reduced conductivity. The doped NNBT system presents a high electrostrictive coefficient of ∼0.06 m4/C2.

Composition-driven normal ferroelectric to relaxor ferroelectric transition with enhanced electrostriction in ternary NBT-BZ-LT ceramics

The NBT based perovskite ferroelectric oxides with high electrostrictive coefficient (Q 33 ) is gaining attention due to their application in high-precision displacement actuators. Herein, (1 −2x)Na0.5Bi0.5TiO3–xBaZrO3–xLaTiO3 (0.01 ≤ x ≤ 0.07) ceramics are produced through a solid-state reaction. X-ray diffraction is used for the structural analysis of the prepared ceramic materials. The influences of BaZrO3 and LaTiO3 on the piezoelectric and electrostrictive properties in Na0.5Bi0.5TiO3 solid solutions is thoroughly investigated using the dielectric spectra, ferroelectric hysteresis loops, and bipolar strain curves. An electrostrictive coefficient Q 33 of 0.0557 m 4 /C 2 is obtained at x = 0.05, with a moderate S–E hysteresis of 26% at an electric field of 60 kV cm−1. These results indicate that (1 −2x)Na0.5Bi0.5TiO3–xBaZrO3–xLaTiO3 ferroelectric ceramics at x = 0.05 could be a promising material for high-precision displacement actuator applications.

A Ferroelectric Aminophosphonium Cyanoferrate with a Large Electrostrictive Coefficient as a Piezoelectric Nanogenerator.

Hybrid materials possessing piezo- and ferroelectric properties emerge as excellent alternatives to conventional piezoceramics due to their merits of facile synthesis, lightweight nature, ease of fabrication and mechanical flexibility. Inspired by the structural stability of aminophosphonium compounds, here we report the first A3 BX6 type cyanometallate [Ph2 (i PrNH)2 P]3 [Fe(CN)6 ] (1), which shows a ferroelectric saturation polarization (Ps ) of 3.71 μC cm-2 . Compound 1 exhibits a high electrostrictive coefficient (Q33 ) of 0.73 m4 C-2 , far exceeding those of piezoceramics (0.034-0.096 m4 C-2 ). Piezoresponse force microscopy (PFM) analysis demonstrates the polarization switching and domain structure of 1 further confirming its ferroelectric nature. Furthermore, thermoplastic polyurethane (TPU) polymer composite films of 1 were prepared and employed as piezoelectric nanogenerators. Notably, the 15 wt % 1-TPU device gave a maximum output voltage of 13.57 V and a power density of 6.03 μW cm-2 .

A Ferroelectric Aminophosphonium Cyanoferrate with a Large Electrostrictive Coefficient as a Piezoelectric Nanogenerator

AbstractHybrid materials possessing piezo‐ and ferroelectric properties emerge as excellent alternatives to conventional piezoceramics due to their merits of facile synthesis, lightweight nature, ease of fabrication and mechanical flexibility. Inspired by the structural stability of aminophosphonium compounds, here we report the first A3BX6 type cyanometallate [Ph2(iPrNH)2P]3[Fe(CN)6] (1), which shows a ferroelectric saturation polarization (Ps) of 3.71 μC cm−2. Compound 1 exhibits a high electrostrictive coefficient (Q33) of 0.73 m4 C−2, far exceeding those of piezoceramics (0.034–0.096 m4 C−2). Piezoresponse force microscopy (PFM) analysis demonstrates the polarization switching and domain structure of 1 further confirming its ferroelectric nature. Furthermore, thermoplastic polyurethane (TPU) polymer composite films of 1 were prepared and employed as piezoelectric nanogenerators. Notably, the 15 wt % 1‐TPU device gave a maximum output voltage of 13.57 V and a power density of 6.03 μW cm−2.

Large electrostrictive coefficients of BaTiO<sub>3</sub>-based lead-free ceramics

AbstractMicro-displacement actuators have important applications in aerospace, semiconductor, industry and other fields. Now most of the lead-based piezoelectric ceramics are used in the market. In consideration of environmental protection and legal restriction, it is urgent to develop lead-free ceramic materials with excellent electrostrictive properties. As a kind of ABO<sub>3</sub>-type ferroelectrics, (Ba,Ca)(Ti,Zr)O<sub>3</sub> lead-free ceramics have attracted a lot of attention because of their high piezoelectricity. In this work, (Ba<sub>0.85</sub>Ca<sub>0.15</sub>)(Ti<sub>0.9</sub>Zr<sub>0.1</sub>)O<sub>3</sub> (BCTZ) ceramics with high electrostrictive coefficient are prepared by the solid-state method. The effects of sintering temperature on the structures and electrical properties of BCTZ ceramics are studied. The results show that the sintering temperature can help to improve density and grain growth of BCTZ ceramic.There are no impurity phases in the BCTZ ceramic systems, and all samples show ABO<sub>3</sub>-type perovskite structures. At room temperature, the crystal structure of BCTZ ceramic forms coexistence of orthogonal (O)-tetragonal (T) phase. The dielectric peak of BCTZ ceramic is widened, and the Curie temperature reaches a maximum value of 110 ℃ when <i>T</i><sub>s</sub> = 1300 ℃. With the increase of sintering temperature, the dielectric peak of BCTZ ceramic gradually becomes narrowed, and the Curie temperature of ceramic moves toward low temperature.As the sintering temperature is 1300 ℃, the grain size of BCTZ ceramic is 1 μm, the large electrostrictive coefficient <i>Q</i><sub>33</sub> (5.84 × 10<sup>–2</sup> m<sup>4</sup>/C<sup>2</sup>) can be obtained, which is about twice that of traditional PZT ceramic. This may be attributed to combination of the surface effect caused by grain size of BCTZ ceramic with the strong ionic nature of A-O chemical bond. In addition, although BCTZ ceramic has an O-T phase boundary near room temperature, the electrostrictive coefficient <i>Q</i><sub>33</sub> of ceramic has good temperature stability in a range of 25–100 ℃. It shows that the crystal phase and temperature have no effect on the electrostrictive coefficient of BCTZ lead-free ceramic. It provides a new idea for designing the high electrostrictive properties of lead-free piezoelectric ceramics with potential applications.

Preparation and electrostrictive properties of polyurethane filled with polypyrrole-carbon black for the energy harvesting application

The polymer composites based on electrostrictive materials with high polarization are attracting scientists because of the prospect of application in energy conversion and electromechanical performance. Polyurethane is one of a good flexible dielectric polymers which is more interesting in electromechanical applications due to its easy fabrication, high dielectric constant, and high electrostrictive coefficient. This work focuses on the dielectric properties and electrostrictive properties of Polyurethane (PU) filled with Polypyrrole-Carbon Black (PPy-CB) various the different concentrations. All polymer composites were prepared by using a film-casting process in solution with DMF solvent. The dielectric properties and conductivity of thin films were investigated by using LCR meter at 1-105 Hz. The results showed that the dielectric constant of composites significantly increases when the concentration of PPy-CB was increased. Moreover, the electrostrictive coefficient of composites also increases when the concentration of PPy-CB was increased. Furthermore, the electrical breakdown stretches were analyzed by using the Weibull model, this result will discuss the relationship when the PPy-CB fillers were used.

Structure, dielectric, electrostrictive and electrocaloric properties of environmentally friendly Bi-substituted BCZT ferroelectric ceramics

In this study, environmentally friendly Bi-substituted [(Ba0.85Ca0.15)1-3x/2Bix](Zr0.1Ti0.9)O3 (BCZT-xBi) ferroelectric ceramics with x = 0–0.08 were prepared using a solid-state sintering method. The structures, dielectric, electrostrictive and electrocaloric properties of the Bi-substituted BCZT ceramics were thoroughly investigated. With an increase in the Bi3+ content, the temperature corresponding to the maximum permittivity (Tm) decreased monotonously. Meanwhile, the broadening of the dielectric peaks and the increase in the relaxation coefficient of the ceramics transformed their typical ferroelectric-to-paraelectric phase transition to diffuse phase transition (DPT). This was further confirmed by the trends shown by the ferroelectric properties of the ceramics. The current peak intensity in current-electric field (I-E) curves decreased with an increase in x and finally became constant, indicating that domain reversal disappeared gradually. High electrostrictive coefficient Q33 values of 0.0307, 0.0299 and 0.0223 m4/C2 were obtained for the ceramics with x = 0.02, 0.04 and 0.06 respectively. The Q33 values of the ceramics indicated their temperature-insensitive nature over the temperature range of 30–120 °C. Although the maximum value of the electrocaloric adiabatic temperature change (ΔT) (0.91 K) was achieved at x = 0.02, the thermally stability of ΔT is improved with an increase in x from 0.02 to 0.06. The results indicated that x = 0.06 improved the thermal stability of the electrostrictive and electrocaloric performance. By increasing the driving field strength, better electrostrictive and electrocaloric responses could be achieved.

Role of polar nanoregions in the enhancement of the recoverable energy storage density and electrostrictive coefficient in the lead free Na0.25K0.25Bi0.5TiO3

The electrostrictive materials are gaining attention for the actuating application because of their positive strain irrespective to the electric field direction and low hysteresis loss. In this work, the room temperature electrostrictive effect of lead free ferroelectrics Na0.3K0.2Bi0.5TiO3 and Na0.25K0.25Bi0.5TiO3 are studied. Due to the relaxor nature of Na0.25K0.25Bi0.5TiO3, sprout shape strain (S) and pinched polarization (P) loops are noticed as a function of electric field (E), which are beneficial for high electrostrictive coefficient and recoverable energy storage density, respectively. The reversible transformation of the polar nanoregion into the ferroelectric domain with electric field is the reason behind the sprout shape S-E loop. This composition shows the dielectric constant of ≈4000 and strain of 0.30% without any Sneg (negative value of strain). The obtained value of the electrostrictive coefficient from the S vs. P2 graph of Na0.25K0.25Bi0.5TiO3 is ≈0.022 m4/C2, which is comparable to 0.93Na0.5Bi0.5TiO3-0.07BaTiO3 composition and other Na0.5−xKxBi0.5TiO3-based binary solid solutions.

Enhanced electric field-induced strain and electrostrictive response of lead-free BaTiO3-modified Bi0.5(Na0.80K0.20)0.5TiO3 piezoelectric ceramics

ABSTRACT Lead-free (1-x)Bi0.5(Na0.80K0.20)0.5TiO3-xBaTiO3 or (1-x)BNKT-xBT (x = 0 – 0.15 mol fraction) piezoelectric ceramics have been investigated. The optimum density was found for the ceramic sintered at 1125°C, corresponding 98 – 99% of their theoretical values. All ceramics had a single perovskite structure. The coexisting mixed tetragonal-rhombohedral phases all over the entire compositional range with tetragonal phase becoming superior at higher BT. The diffuse phase transition was promoted by the addition of BT. With increasing BT content, the Tm and Td values were found to decrease. Phase transition from ferroelectric (FE) phase to ergodic relaxor (ER) phase was also induced by the changes in BT content. These changes significantly suspended long-range ferroelectric order, then correspondingly reducing the Pr and Ec , resulting in an improvement of electrostrictive and electric field-induced strain responses. A significant increasing of electric field-induced strain response (Smax = 0.37% and d*33 = 630 pm/V) is noted for the x = 0.05 ceramic. Furthermore, high electrostrictive coefficient (Q33 ) of 0.0421 m4/C2 is observed for this composition, which was more than ~ 2 times (~108%) as compared to the pure BNKT ceramic. The studied results indicated these ceramics can be considered promising candidates for actuator applications.

Large strain under low electric field in NBT-KBT-BT ceramics synthesized by Sol–Gel approach

In this paper, the (1-4x)(Na0.5Bi0.5)TiO3-3x(K0.5Bi0.5)TiO3-xBaTiO3 ((1-4x)NBT-3xKBT-xBT) ceramics with x = 0.020, 0.034, 0.040, and 0.050 were synthesized by Sol–Gel flame synthetic approach. Decreased ferroelectric-to-relaxor transition temperature and abrupt decrease of piezoelectric constant reveal that the long-range ferroelectric order would be destroyed when x ≥ 0.040, and a composition boundary between ferroelectric (FE) and relaxor phase (RE) is constructed around x = 0.040. As a result, a large strain of 0.30% under a significantly lower external field of 50 kV/cm was achieved for the critical composition at x = 0.040 due to a reversible RE/FE phase transformation, resulting in a large normalized strains Smax/Emax of 600 pm/V accordingly. Meanwhile, high electrostrictive coefficient of 0.0311 m4/C2 with relatively large strain response of 0.22% was obtained at x = 0.050. The findings may pave a way for obtaining large strain under low electric field and high electrostrictive effect in NBT-based system through the appropriate compositional design and optimized preparation technology.

Large electrostrictive effect in Sn-doped NBT–BT lead-free relaxor ceramics

In this work, we design and adjust the composition in [Formula: see text]–[Formula: see text] lead-free relaxor ferroelectrics by doping SnO2 to introduce a relaxor phase and accordingly obtain prominent lead-free electrostrictors. It was found that all the samples exhibited ideal features of relaxor ferroelectrics and the ferroelectric-relaxor phase transition temperature of the ceramics was adjusted to near or below room temperature after doping with a handful of [Formula: see text]. A relatively high electrostrictive coefficient [Formula: see text] of 0.0293 m4/C2 was achieved for the composition with [Formula: see text], which was attributed to the formation of relaxor pseudocubic phase developed by the [Formula: see text] substitution. These results provide some instructive thoughts for the further development of [Formula: see text]-based electrostrictive materials by B-site doping.

Enhanced electro-mechanical coupling of TiN/Ce0.8Gd0.2O1.9 thin film electrostrictor

Gadolium doped ceria, Gd:CeO2 (CGO), have recently been shown to possess an exceptional high electrostriction coefficient (Q), which is at the least three orders of magnitude larger than the best performing lead-based electrostrictors, e.g. Pb(Mn1/3Nb2/3)O3. Herein, we show that CGO thin films fabricated by a pulsed laser deposition method can be directly integrated onto the Si substrate by using TiN films of few nanometers as functional electrodes. The exceptional good coupling between TiN and Ce0.8Gd0.2O1.9 yields a high electrostriction coefficient of Qe = 40 m4 C−2 and a superior electrochemomechanical stability with respect to the metal electrodes.

Optimized strain with small hysteresis and high energy-storage density in Mn-doped NBT-ST system

In this paper, optimized strain obtained at low electric field and accompanied with small hysteresis was achieved simultaneously by inducing defect dipoles into 0.7NBT-0.3ST (NBST) system. Narrow S-E curves with none Srem and large strains of 0.29% and 0.32% with small hysteresis of 24% and 28% were realized at 60 kV/cm in 1 and 5 mol.‰ Mn-doped NBST caramics, respectively. High electrostriction coefficient of 0.0215 and 0.021 m4C2 with pure electrostrictive characteristics and large strain can also be obtained in Mn-doped NBST ceramics. Meanwhile, the electric breakdown field (BDS) of NBST ceramics has been significantly improved after doping with MnO, and large recoverable energy density of 0.93 and 0.97 J/cm3 with a relatively high energy-storage efficiency were obtained accordingly. The findings may pave a way for further optimizing strains, electrostrictive effects and energy-storage properties through the proper selection of base composition and effective chemical modifier.

Ultra-low hysteresis electric field-induced strain with high electrostrictive coefficient in lead-free Ba(ZrxTi1-x)O3 ferroelectrics

From the application point of view, high electric field-induced strain with ultra-low hysteresis or hysteresis-free characteristic is highly desired in high-precision displacement actuators. In this work, lead-free Ba(ZrxTi1-x)O3 (BZT) ferroelectrics with x in the range between 0.02 and 0.1 were fabricated by a conventional solid state reaction method. The structural evolution and electrical properties were investigated systematically with an emphasis on electrostrictive effect. As x increases from 0.02 to 0.1, the crystal lattice parameters (a and c axes) increase while the tetragonality (c/a-1) goes down. In addition, the Curie temperature (TC) of BZT decreases gradually, while the temperatures corresponding to tetragonal-to-orthorhombic (T-O) and orthorhombic-to-rhombohedral (O-R) phase transitions increase. Ultra-low hysteresis (<8%) and high electric field-induced strains (>0.15% at 60 kV/cm) are observed in all studied compositions. Most importantly, a high longitudinal electrostrictive coefficient Q33 (0.0453 m4/C2) was also identified in x = 0.1 composition. This work not only reports high electric field-induced strains with ultra-low hysteresis and high Q33 in lead-free BZT ferroelectrics, but also indicates a potential application for BZT ceramics in high-precision displacement actuators.

Large electromechanical strain and electrostrictive effect in (1 − x)(Bi0.5Na0.5TiO3–SrTiO3)–xLiNbO3 ternary lead-free piezoelectric ceramics

Lead-free (1 − x)(0.8Bi0.5Na0.5TiO3–0.2SrTiO3)–xLiNbO3 (BNST–xLN, x = 0–0.08) piezoelectric ceramics were fabricated by a solid-state sintered technology. The effects of LN-doping on the structural and electrical properties of the BNST–xLN system were systematically investigated. The results of Raman spectroscopy revealed that the substitution of LN softens the phonon vibrations in the BNST–xLN system, in accordance with the remarkable reduction in the phase transition temperature (TF−R), remnant polarization (Pr), negative strain (Sneg) and piezoelectric coefficient (d33). However, the degradation of the long-range ferroelectric orders was accompanied by a significant increase in the electric field–induced strain response. At x = 0.04, a maximum unipolar strain of ~ 0.36% with a corresponding normalized strain (Smax/Emax) of ~ 600 pm/V was obtained at room temperature, which should be mainly ascribed to the reversibly electric field-induced phase transition between the ergodic relaxor and ferroelectric phases due to their comparable free energies in the two-phase coexistence region. Moreover, it was also found that the BNST–xLN system processes predominant electrostrictive behaviors with relatively high electrostrictive coefficient (Q33) and excellent temperature stability when the field-induced phase transition cannot be trigged by the applied electric field, as evidenced by a fact that the Q33 value of BNST–0.08LN ceramic keeps almost constant as high as ~ 0.028 m4/C2 in the temperature range from room temperature to 120 °C.

High electrostrictive effect in La3+-doped Ba(Zr0.2Ti0.8)O3 lead-free ferroelectrics

Perovskite ferroelectric ceramics with Tm (temperature corresponding to maximum dielectric permittivity ε′) around room temperature and high electrostrictive coefficient Q33 are of interest to the applications in high-precision actuators, since low-hysteresis/non-hysteresis and high strain response can be generated in these materials based on a purely electrostrictive effect. In this work, undoped Ba(Zr0.2Ti0.8)O3 (BZT) and La3+-doped Ba(Zr0.2Ti0.8)O3 (BLZT) lead-free ferroelectrics were synthesized by solid state reaction method. Their dielectric and ferroelectric properties were investigated systematically with an emphasis on electrostrictive effect. With respect to increase of La3+ content from 0 to 1%, the Tm of BLZT decreases from 44.5 °C to 14.6 °C, and the diffuseness degree γ increases from 1.814 to 1.993. A conductive mechanism, which is prominent in undoped BZT, is inhibited drastically by introducing the La3+ into BZT. A high electrostrictive strain of 0.08% and a low hysteresis η (<10%) are obtained simultaneously in x = 0.25% composition at room temperature. The Q33 ranges from 0.0377 m4/C2 and 0.0537 m4/C2. This work not only reports a high electrostrictive effect in BLZT ferroelectrics, but also provides BLZT ceramics with a potential application in high-precision actuators.

Temperature-insensitive strain and bright upconversion luminescence in Er-modified 0.88(Bi0.5Na0.5)TiO3-0.22(Bi0.5K0.5)TiO3 ceramics

In this work, 0.88(Bi0.5Na0.5)TiO3-0.22(Bi0.5K0.5)TiO3-xmol%Er (x = 0.00–0.80, 0.88BNT-0.22BKT-xmol%Er) lead-free piezoelectric ceramics were prepared by the solid state reaction method and the effects of Er addition on structure and electrical properties of 0.88BNT-0.22BKT ceramics were investigated. Results showed that Er additive within the content of 0.80mol% diffuse into the 0.88BNT-0.22BKT lattice to form a pure perovskite phase structure. Pure 0.88BNT-0.22BKT ceramic shows a large field strain of 0.21% at room temperature, but it is depended greatly on the temperature. As 0.4–0.8mol%Er doped into the 0.88BNT-0.22BKT host, they show a temperature-insensitive strain characteristic in the temperature range from room temperature to 120 °C. Furthermore, a large electrostrictive effect with high electrostrictive coefficient Q33 of 0.016–0.019m4/C2 comparable with that of traditional lead-based electrostrictors is obtained in these Er-modified materials. Moreover, Er-modified 0.88BNT-0.22BKT samples exhibit a strong green upconversion emission under a 980 nm LD excitation. These results suggest that this kind of material is promising candidate used as multifunctional devices by integrating its electrostrictive and upconversion luminescence properties.

A strategy for obtaining high electrostrictive properties and its application in barium stannate titanate lead-free ferroelectrics

Recently electrostrictive effect in ferroelectrics has attracted much attention, since the electric field-induced strain based on such an effect possesses an ultra-low hysteresis, which is of special interest to both fundamental research and potential application in high-precision actuators. In this paper, we propose a strategy to obtain high electrostrictive properties in ABO3 perovskite structure BaTiO3 (BT)-based ferroelectric ceramics by means of doping. The doping element, amount, valence as well as position are specified according to this strategy. It is suggested that B-site Sn4+-doped BT, i.e., Ba(Ti1-xSnx)O3 (BTS), would possess superior electrostrictive properties. The structural evolution and electrical properties of BTS ferroelectric ceramics were investigated in detail in order to verify this deduction. Besides the ferroelectric-to-relaxor transition with respect to the increase of x from 0.06 to 0.11, expected and high electric field-induced strain (> 0.08% at 40 kV/cm) with a very ultra-low hysteresis (< 8%) is obtained in x = 0.10–0.11 compositions. High longitudinal electrostrictive coefficient Q33 ranges from to 0.0398 m4/C2 to 0.0515 m4/C2 accompanying with temperature- and composition-insensitive characteristics. These results not only prove the effectiveness of this strategy, but also pave a way to search for novel kinds of electrostrictive systems in ferroelectrics.