四方晶系
正交晶系
材料科学
电介质
晶体结构
微波食品加热
烧结
分析化学(期刊)
Crystal(编程语言)
陶瓷
矿物学
粒度
结晶学
复合材料
化学
光电子学
物理
色谱法
量子力学
计算机科学
程序设计语言
作者
Fei Liang,Meng Ni,Wenzhong Lü,Guifen Fan
标识
DOI:10.1016/j.jallcom.2013.03.059
摘要
The microwave dielectric and sintering properties of 0.7CaTiO3–0.3[LaxNd(1−x)]AlO3 (CTLNA) specimens have been investigated in this work. It has been found that microwave dielectric properties and crystal structures depend on the LaAlO3 content. When x < 0.5, the crystal structure of 0.7CaTiO3–0.3[LaxNd(1−x)]AlO3 was tetragonal and it changed to the orthorhombic structure when x ⩾ 0.5. When x = 0.5, specimens exhibited excellent microwave dielectric properties with εr = 46.51, Q × f = 39,928 GHz (@3.8 GHz), τf = + 10 ppm/°C. In order to further improve the microwave dielectric properties of the samples, Ca2+ in 0.7CaTiO3–0.3[LaxNd(1−x)]AlO3 were partially substituted by Sr2+. The results showed that the addition of SrTiO3 inhibited the growth of the crystal grain and improved the densification of specimens. By optimizing the composition and preparation process, CTLNA specimens with δ = 0.01 in 0.7[SrδCa(1−δ)]TiO3–0.3[La0.5Nd0.5]AlO3 (SCTLNA) showed high density and a uniform grain structure with εr = 45.87, Q × f = 41612 GHz (@4 GHz), τf = + 10 ppm/°C.
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