Structure, Dielectric Properties and Temperature Stability of BaTiO3–Bi(Mg1/2Ti1/2)O3 Perovskite Solid Solutions
Structure, Dielectric Properties and Temperature Stability of BaTiO3–Bi(Mg1/2Ti1/2)O3 Perovskite Solid Solutions
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DOI：
10.1111/j.1551-2916.2011.04519.x
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发表时间：
2011-10
影响因子：
3.9
通讯作者：
Bo Xiong;H. Hao;Shujun Zhang;Hanxing Liu;M. Cao
中科院分区：
文献类型：
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作者：
Bo Xiong;H. Hao;Shujun Zhang;Hanxing Liu;M. Cao
采用固态加工技术制备了（1−x） BaTiO3-xBi (Mg1/2Ti1/2)O3[(1−x) BT-xBMT]多晶陶瓷。测定（1−x） BT-xBMT的溶解度极限约为x=0.07。在室温下，当x≥0.05时，观察到铁电四方相到赝赝相的系统结构变化。电介质测量表明，在含有30-60 mol% Bi(Mg1/2Ti1/2)O3的固溶体中，纯BaTiO3的正常铁电特性逐渐转变为高色散弛豫特性，在较宽的温度范围内显示出低温电容系数。研究了掺nb2o5的0.85BT-0.15BMT陶瓷的性能，以更好地了解核壳结构的形成机理，进一步提高介电性能的温度稳定性。
(1−x)BaTiO3–xBi(Mg1/2Ti1/2)O3 [(1−x)BT–xBMT] polycrystalline ceramics were obtained via solid-state processing techniques. The solubility limit for (1−x)BT–xBMT was determined to be about x=0.07. A systematic structural change from the ferroelectric tetragonal phase to pseudocubic phase was observed at about x≥0.05 at room temperature. Dielectric measurements revealed a gradual change from normal ferroelectric of pure BaTiO3 to highly dispersive relaxor-like characteristics in the solid solution with 30–60 mol% Bi(Mg1/2Ti1/2)O3, showing low-temperature coefficients of capacitance over a wide temperature range. The properties of Nb2O5-doped 0.85BT–0.15BMT ceramics were investigated to better understand the formation mechanism of core-shell structure, for further improving the temperature stability of the dielectric behavior.