首页> 外文OA文献 >Synthesis and Characterization of Ferroelectric and Antiferroelectric Complex Perovskite Systems
【2h】

Synthesis and Characterization of Ferroelectric and Antiferroelectric Complex Perovskite Systems

机译:铁电和反铁电复合钙钛矿体系的合成与表征

代理获取
本网站仅为用户提供外文OA文献查询和代理获取服务,本网站没有原文。下单后我们将采用程序或人工为您竭诚获取高质量的原文,但由于OA文献来源多样且变更频繁,仍可能出现获取不到、文献不完整或与标题不符等情况,如果获取不到我们将提供退款服务。请知悉。

摘要

Single crystals of Pb(Sc1/2Nb1/2)O3 (PSN) were grown by a high-temperature solution method using (PbO + B2O3) as flux. X-ray diffraction (XRD) indicates a pure perovskite phase without B-site ordering. Polarized light microscopy shows that the crystals are of rhombohedral symmetry at room temperature and become cubic at 112 oC on heating which is the Curie temperature (TC). A relaxor-to-ferroelectric phase transition is confirmed by dielectric spectroscopy. Frequency-dependent permittivity is also observed, revealing relaxor behavior. Poling the crystal at room temperature does not change TC but suppresses the permittivity. A typical ferroelectric hysteresis loop is obtained at room temperature, indicating the ferroelectric nature of the PSN crystal.A new antiferroelectric solid solution ceramics of (1-x)PbZrO3-xPb(Zn1/2W1/2)O3 [(1-x)PZ-xPZnW, with x = 0 - 10%] has been prepared by conventional solid state reaction method. XRD reveals the perovskite structure of the (1-x)PZ-xPZnW ceramics. TC decreases when the percentage of PZnW increases. Meanwhile, another transition related to the transformation from antiferroelectric (AFE) to an intermediate ferroelectric (FE) phase was observed and its transition temperature (TAFE-FE) decreases from 213 oC for x = 0 to 58 oC for x = 0.10. A typical FE hysteresis loop was obtained, indicating the FE nature of the intermediate phase.The 0.97PbZrO3-0.03Pb(Zn1/2W1/2)O3 (97%PZ-3%PZnW) ceramic was used to study the intermediate FE phase. The temperature dependence of dielectric permittivity was studied. TC on cooling and heating are both 212 oC, indicating a second-order phase transition. Another phase transition below TC was observed, from the AFE phase at room temperature to an intermediate phase at higher temperature. This transition shows thermal hysteresis on cooling and heating, representing a first-order phase transition. Within the temperature range of the intermediate phase, ferroelectric hysteresis loops were displayed and a non-centrosymmetric structure was revealed by second harmonic generation, which indicates the FE nature for the intermediate phase. High resolution XRD and the subsequent refinement results show that the intermediate FE phase is rhombohedral (R3m) and the AFE phase is orthorhombic (Pbam). A phase diagram of the (1-x)PbZrO3-xPb(Zn1/2W1/2)O3 solid solution has been established.
机译:通过使用(PbO + B2O3)作为助熔剂的高温固溶法生长Pb(Sc1 / 2Nb1 / 2)O3(PSN)的单晶。 X射线衍射(XRD)表示纯钙钛矿相,无B位有序。偏光显微镜显示,晶体在室温下呈菱面体对称性,在112 oC加热(居里温度(TC))时变为立方晶。通过介电谱确认弛豫到铁电的相变。还观察到了随频率变化的介电常数,揭示了弛豫器的行为。在室温下对晶体进行极化不会改变TC,但会抑制介电常数。在室温下获得了典型的铁电磁滞回线,表明了PSN晶体的铁电特性。(1-x)PbZrO3-xPb(Zn1 / 2W1 / 2)O3 [(1-x)PZ -xPZnW,x = 0-10%]是通过常规的固态反应方法制备的。 XRD显示(1-x)PZ-xPZnW陶瓷的钙钛矿结构。当PZnW的百分比增加时,TC降低。同时,观察到与从反铁电(AFE)转变为中间铁电(FE)相有关的另一种转变,其转变温度(TAFE-FE)从x = 0的213 oC降低到x = 0.10的58 oC。获得了典型的FE磁滞回线,表明了中间相的FE性质。使用0.97PbZrO3-0.03Pb(Zn1 / 2W1 / 2)O3(97%PZ-3%PZnW)陶瓷研究中间FE相。研究了介电常数的温度依赖性。冷却和加热时的TC均为212 oC,表明发生了二级相变。观察到低于TC的另一相变,从室温下的AFE相到更高温度下的中间相。该转变表现出冷却和加热时的热滞,代表一阶相变。在中间相的温度范围内,显示了铁电磁滞回线,并且通过二次谐波的产生揭示了非中心对称的结构,这表明中间相的FE性质。高分辨率XRD和随后的优化结果表明,中间FE相为菱形(R3m),AFE相为正交晶(Pbam)。已建立(1-x)PbZrO3-xPb(Zn1 / 2W1 / 2)O3固溶体的相图。

著录项

  • 作者

    Huo Siqi;

  • 作者单位
  • 年度 2014
  • 总页数
  • 原文格式 PDF
  • 正文语种
  • 中图分类

相似文献

  • 外文文献
  • 中文文献
  • 专利

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号