李超;丁士华;朱惠;张云;孙明鑫;游璐;

• 1:西华大学材料科学与工程学院

摘要(Abstract)：

通过固相烧结法制备了BaAl_(2-2x)Mg_(2x)Si_2O_8(x=0,0.005,0.01,0.02,0.03)陶瓷,研究了不同Mg~(2+)取代量对BaAl_2Si_2O_8(BAS)系陶瓷晶体结构和介电性能的影响。利用基于第一性原理的CASTEP计算了Mg掺杂BAS不同位置的形成能能和总能量。结果表明Mg应当进入Al位,Mg~(2+)取代Al~(3+)生成的氧空位可以促进BAS转变为单斜相,从而改善样品的密度、品质因素(Q×f)及谐振频率温度系数(τ_f)。x=0.005时,样品经1500℃烧结后表现出最佳的介电性能:εr=6.74,Q×f=36125 GHz,τ_f=-26.97×10~(-6)/℃。

关键词(KeyWords)： BaAl_2Si_2O_8;晶体结构;氧空位;单斜相;介电性能

Abstract:

Keywords:

基金项目(Foundation): 四川省科技计划项目(2019YFG0234);; 国家自然科学基金(51902268)

作者(Author): 李超;丁士华;朱惠;张云;孙明鑫;游璐;

Email:

DOI: 10.16521/j.cnki.issn.1001-9642.2020.12.002

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