Decisive role of MgO addition in the ultra-broad temperature stability of multicomponent BaTiO3-based ceramics
Decisive role of MgO addition in the ultra-broad temperature stability of multicomponent BaTiO3-based ceramics
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DOI：
10.1016/j.ceramint.2013.06.110
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发表时间：
2014
影响因子：
5.2
通讯作者：
Lingxia Li;Mingjing Wang;Liu Yaran;Chen Jun-xiao;Zhang Ning
中科院分区：
文献类型：
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作者：
Lingxia Li;Mingjing Wang;Liu Yaran;Chen Jun-xiao;Zhang Ning
通过合成由BaTiO 3、Na0.5Bi0.5TiO3、Nb 2 O 5、CeO 2、玻璃和MgO组成的多组分BaTiO 3基陶瓷，实现了在−55 °C至300 °C超宽温度范围内的高电容温度稳定性（电容在室温电容的±15%以内）。值得注意的是，MgO的加入在实现超宽温度稳定性和获得适当的微观结构方面起着决定性的作用。掺杂不同含量的MgO可以显著改变介电常数的温度依赖性，特别是在200 °C-300 °C的高温范围内。通过掺杂适量的MgO，最大电容变化率由-60%降至10%。在微观结构方面，MgO添加剂可以抑制不利于电容温度稳定性的富钛相和片状晶粒的形成。当MgO含量为1.5wt%时，样品在室温下具有良好的上级介电性能（εr=1675，tanδ= 1.452%，ρV=5×1012Ω cm）。
High capacitance temperature stability (the capacitance is within ±15% of room temperature capacitance) in an ultra-broad temperature range of −55 °C to 300 °C has been achieved by synthesizing multicomponent BaTiO3-based ceramics consisting of BaTiO3, Na0.5Bi0.5TiO3, Nb2O5, CeO2, glass and MgO. Significantly, MgO addition plays a decisive role in achieving the ultra-broad temperature stability and acquiring an appropriate microstructure. Doping different amounts of MgO can alter the temperature dependence of dielectric constant markedly, especially in a high temperature range of 200 °C–300 °C. The maximum capacitance variation rate is reduced from −60% to only 10% by doping appropriate content of MgO. In terms of the microstructure, MgO additive can suppress the formation of Ti-rich phase and sheet grains, which are detrimental to the capacitance temperature stability. The sample with 1.5 wt% MgO has superior dielectric and electrical properties at room temperature (εr=1675, tanδ=1.452%, andρV=5×1012Ω cm).