摘要
采用一种新颖的混合钙钛矿结构法制备了锰掺杂钠过量K0.5Na0.7NbO3-xMnO2陶瓷,研究了不同锰掺杂量和烧结温度对该系列陶瓷微观结构、形貌和介电性能的影响。研究表明,锰掺杂改善了该系列陶瓷的烧结特性;陶瓷样品中均形成了正交钙钛矿结构,但同时都存在少量第二相物质;随着烧结温度的升高,陶瓷样品中第二相物质的含量逐渐减少;在不同锰掺杂量陶瓷样品的SEM分析中可以看出,掺少量锰的陶瓷样品出现晶粒异常长大且大小不均匀现象;1100℃烧结的锰掺杂量为摩尔分数1.5%的陶瓷中含有最少的第二相物质和最优的综合介电性能,即具有均匀的晶粒大小、最大的相对介电常数和较小的介电损耗,该陶瓷样品由正交向四方的相转变温度为176℃、居里温度为403℃。
The manganese doped K0. 5 Na0. 7 NbO3 -xMnO2 with excessive sodium ceramics were prepared by a novel method of mixed perovskite structure. The effects of manganese amount and sintering temperature on the phase structure, microscopic morphology and dielectric properties of ceramics were investigated. It is found that the introduction of MnO2 promotes the sintering of ceramics. All ceramics show orthorhombic perovskite structure with small amount of second phase. The amount of second phase reduces with increasing sintering temperature for the ceramic. The abnormal grain growth and grain size inhomogeneity appears in the ceramics with less MnO2 , which is revealed by SEM images of the ceramics. The highest dielectric constant with small dielectric loss were obtained in 1. 5% mole fraction-doped ceramic that sintered at 1100 ℃, which owned the least secondary phase and the most homogeneous grains. This ceramic shows a Curie temperature of 403 ℃, and the phase transition temperature between tetragonal and orthorhombic is about 176 ℃.
作者
田爱芬
惠璇
杨静
范金玉
TIAN Aifen;HUI Xuan;YANG Jing;FAN Jinyu(School of Materials Science and Engineering,Xi’an University of Science and Technology,Xi’an 710054,China)
出处
《电子元件与材料》
CAS
CSCD
北大核心
2019年第5期19-22,27,共5页
Electronic Components And Materials
基金
陕西省教育厅专项科学研究计划(16JK1511)
陕西省高速公路施工机械重点实验室开放基金项目(300102259510)
2018年省级大学生创新创业项目(201810704044)
关键词
无铅陶瓷
铌酸钾钠
锰掺杂
介电性能
混合钙钛矿结构法
lead -free ceramics
potassium -sodium niobate
manganese doping
dielectric properties
mixing perovskite structure method
