Conduction properties of acceptor-doped BaTiO3–Bi(Zn1/2Ti1/2)O3-based ceramics
Conduction properties of acceptor-doped BaTiO3–Bi(Zn1/2Ti1/2)O3-based ceramics
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DOI：
10.1007/s10853-020-05175-4
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发表时间：
2020-09
影响因子：
4.5
通讯作者：
Ryan R. McQuade;P. Mardilovich;Nitish Kumar;D. Cann
中科院分区：
文献类型：
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作者：
Ryan R. McQuade;P. Mardilovich;Nitish Kumar;D. Cann
采用固相合成法制备了(1-x)BaTiO_3-xBI(Zn_(1/2)Ti_(1/2))O_3(BT- )系列受主掺杂陶瓷，其中ex=BZT_(0.1，0.2，0.3，0.4)，研究了掺杂和掺杂量对材料导电性能的影响。阻抗谱测量表明，通过在钛晶位()上掺杂受主镁，提高了电导率。在本研究中，0.80BaTiO_3-0.20Bi(Zn_(1/2)Ti_(1/2))O_3陶瓷在1.28M−1(~ 600°C)下表现出最高的电导率，比化学计量比成分提高了一个数量级。可变的pO2阻抗测量表明，颗粒中存在p型电导率，而电动势测量表明，在 ~ 550℃以上，离子是主要的载流子(735℃时的转移数ti= 0.91)。类似地，在x= 0.1时以上的所有3摩尔%的镁掺杂组份都是主要的离子导体，其转移数大于等于 0.79(735°C)。X射线衍射数据显示，所有样品均为假立方主相，并有证据表明，当样品的摩尔分数为3%或更高时，伴随着额外的杂质相。
A series of acceptor-doped ceramics based on the solid solution, (1-x)BaTiO3–xBi(Zn1/2Ti1/2)O3(BT-BZT), wherex= 0.1, 0.2, 0.3, 0.4, were prepared via solid-state synthesis to investigate the effect of doping and BZT content on conduction properties. Impedance spectroscopy measurements showed an increase in conductivity through acceptor doping with Mg on the Ti-site (). Ceramics of the composition, 0.80BaTiO3–0.20Bi(Zn1/2Ti1/2)O3with 3 mol%, showed the highest conductivity in this study at 1.28 mScm−1(~ 600 °C), an order of magnitude improvement over the stoichiometric composition. Variable pO2impedance measurements revealedp-type conductivity in the grain while EMF measurements showed that above ~ 550 °C, ions are the dominant charge carriers (transference number,ti= 0.91 at 735 °C). Similarly, all 3 mol% Mg-doped compositions abovex= 0.1 were primarily ionic conductors with transference numbers aboveti= 0.79 (735 °C). X-ray diffraction data showed a pseudocubic primary phase for all samples with evidence of additional impurity phases accompanying samples with 3 mol%or greater.