Spark plasma sintering of dielectric BaTaO2N close to the melting point of the BaCN2 additive
Spark plasma sintering of dielectric BaTaO2N close to the melting point of the BaCN2 additive
复制标题
接近 BaCN2 添加剂熔点的电介质 BaTaO2N 的放电等离子烧结
DOI：
10.1016/j.jeurceramsoc.2020.02.008
复制
发表时间：
2020
影响因子：
5.7
通讯作者：
Shinichi Kikkawa
中科院分区：
文献类型：
--
作者：
Akira Hosono;Masashi Inoguchi;*Yuji Masubuchi;Koji Murayama;Michiaki Iha;Mikio Higuchi;Shinichi Kikkawa
钙钛矿型氮氧化物BaTaO_2N是一种很有前途的无铅弛豫铁电材料。然而，这种材料在高于1350 °C的烧结过程中会释放一部分氮。随后在氨流下对所得烧结的BaTaO2N0.85陶瓷进行退火，以恢复绝缘的、化学计量的BaTaO2N陶瓷。最近，据报道，熔融BaCN 2是一种有用的助熔剂，用于制备BaTaO 2 N微晶而不损失氮。在目前的工作中，BaTaO2N粉末烧结与BaCN2添加剂在机械压力下，使用放电等离子烧结系统。在约900 °C的液相烧结过程中，避免了BaTaO2N陶瓷的氮损失。相对密度为79.8%的化学计量比BaTaO2N陶瓷产品是电绝缘体，并且在室温下其相对介电常数εr在320至650的范围内，损耗tanδ值在0.04至0.19之间。
The perovskite-type oxynitride BaTaO2N is a promising lead-free relaxor ferroelectric material. However, this material releases a part of its nitrogen during its sintering above 1350 °C. Subsequent annealing of the resulting sintered BaTaO2N0.85ceramics under an ammonia flow is necessary to recover an insulating, stoichiometric BaTaO2N ceramics. Very recently, molten BaCN2was reported to be a useful flux for the preparation of BaTaO2N microcrystals without the loss of nitrogen. In the present work, BaTaO2N powder was sintered with a BaCN2additive under mechanical pressure, using a spark plasma sintering system. Nitrogen loss from the BaTaO2N ceramic was avoided during liquid phase sintering at approximately 900 °C. The stoichiometric BaTaO2N ceramic product with a relative density of 79.8 % was an electrically insulator and it showed its relative dielectric constants,εr, in the range from 320 to 650 and a loss tanδvalues from 0.04 to 0.19 at room temperature.