Ba_0.85Ca_0.15Zr_0.10Ti_0.90O₃ (BCZT) lead-free ceramics demonstrated excellent dielectric, ferroelectric, and piezoelectric properties at the morphotropic phase boundary (MPB). So far, to study the effect of morphological changes on dielectric and ferroelectric properties in lead-free BCZT ceramics, researchers have mostly focused on the influence of spherical grain shape change. In this study, BCZT ceramics with rod-like grains and aspect ratio of about 10 were synthesized by surfactant-assisted solvothermal route. X-ray diffraction (XRD) and selected area electron diffraction (SAED) performed at room temperature confirm the crystallization of pure perovskite with tetragonal symmetry. Scanning electron microscopy (SEM) image showed that BCZT ceramics have kept the 1D rod-like grains with an average aspect ratio of about 4. Rod-like BCZT ceramics exhibit enhanced dielectric ferroelectric (ɛ_r = 11,906, tanδ = 0.014, P_r = 6.01 μgC/cm², and E_c = 2.46 kV/cm), and electrocaloric properties (ΔT = 0.492 K and gZ = 0.289 (K·mm)/kV at 17 kV/cm) with respect to spherical BCZT ceramics. Therefore, rod-like BCZT lead-free ceramics have good potential to be used in solid-state refrigeration technology.

中文翻译：

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无铅棒状BCZT陶瓷中增强的介电和电热性能

Ba _0.85 Ca _0.15 Zr _0.10 Ti _0.90 O ₃（BCZT）无铅陶瓷在同相相界（MPB）处显示出优异的介电，铁电和压电性能。到目前为止，为了研究形态变化对无铅BCZT陶瓷介电和铁电性能的影响，研究人员主要集中在球形晶粒形状变化的影响上。在这项研究中，通过表面活性剂辅助溶剂热法合成了棒状晶粒且长径比约为10的BCZT陶瓷。在室温下进行的X射线衍射（XRD）和选择区域电子衍射（SAED）证实了具有方形对称性的纯钙钛矿的结晶。扫描电子显微镜（SEM）图像显示，BCZT陶瓷保留了一维棒状晶粒，平均长径比约为4。_r = 11,906，tanδ= 0.014，P _r = 6.01μgC/ cm ²，E _c = 2.46 kV / cm），电热特性（ΔT = 0.492 K，gZ = 0.289（K·mm）/ kV，17 kV / cm）关于球形BCZT陶瓷。因此，棒状BCZT无铅陶瓷具有在固态制冷技术中使用的良好潜力。