Additive Sintering, Postannealing, and Dielectric Properties of SrTaO2N
Additive Sintering, Postannealing, and Dielectric Properties of SrTaO2N
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DOI：
10.1111/jace.12806
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发表时间：
2014-04
影响因子：
3.9
通讯作者：
Shikuan Sun;Ya-ru Zhang;Y. Masubuchi;T. Motohashi;S. Kikkawa
中科院分区：
文献类型：
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作者：
Shikuan Sun;Ya-ru Zhang;Y. Masubuchi;T. Motohashi;S. Kikkawa
使用 Sr2Ta2O7 氮化制备的粉末，研究了在烧结和退火过程中 SrTaO2N 陶瓷的化学成分和电绝缘性的保持。由于SrTaO2N的热稳定性较低，在1100℃以上热处理后，SrO和氮的部分损失导致TaO0.9杂质的形成。采用烧结添加剂SrCO3和NH3中的后退火来补偿SrO和氮的损失，以获得具有原始化学成分的陶瓷。将不同相对密度（RD）的烧结态SrTaO2N陶瓷在NH3中退火，观察颜色和电绝缘性的恢复情况。结果发现，RD=95.1%的烧结良好的样品内部无法通过退火恢复，并继续表现出半导体行为和黑色。另一方面，对于RD<84%的烧结态SrTaO2N陶瓷，退火后氮含量和电绝缘性能都完全恢复。退火后的 SrTaO2N 陶瓷 (RD = 83.3%) 具有 450 的相对较大介电常数，在 100 Hz 时介电损耗低于 0.1，几乎与频率和温度无关。
The maintaining of the chemical composition and electrical insulativity of SrTaO2N ceramics was investigated during sintering and annealing, using powders prepared by the nitridation of Sr2Ta2O7. Due to the low thermal stability of SrTaO2N, the partial loss of SrO and nitrogen induced the formation of a TaO0.9 impurity after heat-treating at above 1100°C. The sintering additive SrCO3 and postannealing in NH3 were employed to compensate for the loss of SrO and nitrogen to obtain ceramics with the original chemical composition. The as-sintered SrTaO2N ceramics with various relative density (RD) were annealed in NH3 to observe the recovery of color and electrical insulativity. It was found that the inner part of the well-sintered samples with RD = 95.1% could not be recovered by annealing, and continued to exhibit semiconducting behavior and a black color. On the other hand, for the as-sintered SrTaO2N ceramics with RD < 84%, both the nitrogen content and electrically insulating behavior were completely recovered after annealing. The postannealed SrTaO2N ceramics (RD = 83.3%) possessed a relatively large dielectric constant of 450 with a low dielectric loss of less than 0.1 at 100 Hz, almost independent of frequency and temperature.