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Ba_(0.6)Sr_(0.4)TiO_3-Li_2O陶瓷的结构、性能及其在偏置电场下的极化响应 被引量:1

Structure,properties of Ba_(0.6)Sr_(0.4)TiO_3-Li_2O ceramic and its polarization response in bias electric field
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摘要 采用柠檬酸盐法制备名义组成为Ba_(0.6)Sr_(0.4)TiO_3+x%Li_2O(x=0、0.2、0.4、0.6、0.8)的陶瓷材料,研究在低温烧结条件下Li_2O含量对所制陶瓷材料的结构和介电性能的影响,并分析在偏置电场下所制陶瓷材料的介电响应及其内部极化行为。结果表明,室温下Li_2O固溶进入Ba_(0.6)Sr_(0.4)TiO_3晶格后,引起钙钛矿结构晶体的(200)晶面衍射峰的偏移和材料铁电-顺电相变温度的降低;处于顺电相的陶瓷材料中存在极性微区(PNRs),其对材料的非线性介电性能产生一定的贡献;添加较低含量的Li_2O(w(Li_2O)≤0.6%),陶瓷材料的PNRs尺寸和极化强度变化不明显,而Ba_(0.6)Sr_(0.4)TiO_3+0.8%Li_2O的PNRs尺寸和极化强度发生了明显的变化。 With citrate method,the ceramic materials with nominal composition of Ba 0.6 Sr 0.4 TiO 3+x%Li 2O(x=0,0.2,0.4 0.6,0.8)were prepared.The effects of Li 2O content on structure and dielectric properties of the ceramic materials prepared by low temperature sintering were investigated.At the same time,the dielectric response and polarization of the ceramic materials prepared in bias electric field were studied.The results show that Li 2O dissolved into Ba 0.6 Sr 0.4 TiO 3 lattice at room temperature will lead to peak shift of(200)crystal plane of the perovskite structure and the temperature decrease between ferroelectric and paraelectric state of the materials.The polar nano-regions(PNRs)exist in ceramic materials under the paraelectric background,which has a certain contribution to the dielectric nonlinear properties of the materials.After adding a low content of Li 2O(w(Li 2O)≤0.6%),PNRs size and polarization intensity of the ceramic materials have no obvious changes,while those of Ba 0.6 Sr 0.4 TiO 3+0.8%Li 2O show significant changes.
作者 张校飞 左小华 汪汝武 Zhang Xiaofei;Zuo Xiaohua;Wang Ruwu(College of Mathematics and Physics,Hubei Ploytechnic University,Huangshi 435003,China;College of Chemistry and Chemical Engineering,Hubei Ploytechnic University,Huangshi 435003,China;College of Sciences,Wuhan University of Science and Technology,Wuhan 430065,China)
出处 《武汉科技大学学报》 CAS 北大核心 2018年第2期99-104,共6页 Journal of Wuhan University of Science and Technology
基金 国家自然科学基金资助项目(51372077) 湖北省教育厅科学技术研究项目(B2016277)
关键词 Ba0.6Sr0.4TiO3 LI2O BST 介电性能 极化响应 偏置电场 极性微区 Ba0.6 Sr0.4 TiO 3 Li2O BST dielectric property polarization response bias electric field polar nano-region
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