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首页> 外文期刊>International journal of materials science >Effect of Sm and La off-valent Ion Substitution in BT Ceramics Synthesized by Modified Solid State Route
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Effect of Sm and La off-valent Ion Substitution in BT Ceramics Synthesized by Modified Solid State Route

机译：改性固态法合成Sm和La离子交换对BT陶瓷的影响

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摘要

Modified barium titanate (Ba_(1-x)A xTi_(1-x/4)O_3, where A=Sm and La and x=0.02)/BST & BLT ferroelectric samples were synthesized in single perovskite phase by modified solid state route. For single perovskite phase and dense grain morphology formation, 900℃ and 1300℃ temperatures were optimized as calcination and sintering temperatures, respectively. Room temperature (RT) dielectric constant (ε_r) and dielectric loss (tanδ) of BST and BLT systems at 1 kHz frequency were found to be ~2800, 0.028 and 5200, 0.15, respectively. Normal phase transition with T_c ~ 76℃ was observed in BST system whereas a diffuse phase transition with T_c ~ 85°C was observed in BLT system. Development of well saturated polarization vs. electric field (PE) loops with P_rand E_c ~5.8μC/cm~2, 5.1kV/cm and 1.8μC/cm~2, 1.2kV/cm in BST and BLT systems, respectively suggested their ferroelectric nature. High value of ε_r at RT in BLT system suggested it as a useful material for multilayer capacitor (MLC) applications.
机译：改性钛酸钡（Ba_（1-x）A xTi_（1-x / 4）O_3，其中A = Sm和La且x = 0.02）/ BST和BLT铁电样品通过改良的固态途径在单个钙钛矿相中合成。对于钙钛矿单相和致密晶粒形态的形成，分别优化了900℃和1300℃的煅烧温度和烧结温度。发现BST和BLT系统在1 kHz频率下的室温（RT）介电常数（ε_r）和介电损耗（tanδ）分别为〜2800、0.028和5200、0.15。在BST系统中观察到T_c〜76℃的正常相变，而在BLT系统中观察到T_c〜85°C的扩散相变。在BST和BLT系统中分别开发了P_rand E_c〜5.8μC/ cm〜2、5.1kV / cm和1.8μC/ cm〜2、1.2kV / cm的饱和饱和极化-电场（PE）回路，表明它们的铁电性性质。 BLT系统中RT处的ε_r值很高，表明它是多层电容器（MLC）应用的有用材料。

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