Direct synthesis of SrTaO2N from SrCO3/Ta3N5 involving CO evolution
Direct synthesis of SrTaO2N from SrCO3/Ta3N5 involving CO evolution
复制标题
DOI：
10.1016/j.jeurceramsoc.2014.07.003
复制
发表时间：
2014-12
影响因子：
5.7
通讯作者：
Shikuan Sun;T. Motohashi;Y. Masubuchi;S. Kikkawa
中科院分区：
文献类型：
--
作者：
Shikuan Sun;T. Motohashi;Y. Masubuchi;S. Kikkawa
采用Ta 3 N5与SrCO 3反应制备SrTaO 2N粉体，代替传统的SrTaO3.5氮化法制备SrTaO 2N粉体。研究了反应过程中的物相演变和反应机理。在Ta 3 N5/SrCO 3热处理过程中观察到CO、CO2和N2的混合气体析出。SrTaO 2N产物具有330 nm的平均粒度，在化学计量的氧和氮含量下具有窄的分布。采用无压烧结法制备了不同致密度的SrTaO_2N陶瓷，显示出良好的烧结性能。RD = 82.8%的完全退火的SrTaO 2N块体显示出相对大的介电常数和改善的介电损耗。
SrTaO2N powder was prepared by a novel reaction between Ta3N5and SrCO3, instead of the traditional nitridation of SrTaO3.5. The phase evolution and reaction mechanism during the reaction were investigated. The mixed gas evolution of CO, CO2and N2were observed in the heat-treatment of Ta3N5/SrCO3. The SrTaO2N product possessed an average particle size of 330 nm in a narrow distribution with the stoichiometric oxygen and nitrogen content. Its ceramics with various relative density were also fabricated by pressureless sintering of the as-prepared SrTaO2N powder, showing a high sinterability. The fully-annealed SrTaO2N bulks with a RD = 82.8% showed a relatively large dielectric constant and an improved dielectric loss.