缺陷型钙钛矿材料的成分及介电性能分析
he analysis of compositions and dielectric properties of deficient perovskite material
a(Li1/3Nb2/3)O3-δ陶瓷具有大量氧空位却具有优秀的微波介电性能且较低的烧结温度，有望实现在贱金属内电极多层陶瓷电容器中的应用，但是其结构与相组成关系等仍未十分清楚。本论文重点研究了Ca-Li-Nb-O陶瓷体系中的钙钛矿结构材料在800度固相反应的相组成关系，发现在Ca(Li1/3Nb2/3)O3-δ- Ca(Li1/2Nb1/2)O3-δ-Ca4Nb2O9的区域内存在1：2有序钙钛矿结构固溶体区域，而Ca(Li1/4Nb3/4)O3和Ca8/7(Li1/7Nb5/7)O3-δ为简单钙钛矿相。Ca(Li1/4Nb3/4)O3, Ca(Li1/3Nb2/3)O3-δ和Ca(Li1/2Nb1/2)O3-δ陶瓷均能在氮气气氛下烧结致密，介电常数约30，且在1MHz下介电损耗为10-3-10-4。
a(Li1/3Nb2/3)O3-δ ceramics have received much attention because of good microwave dielectric properties and a low sintering temperature. The exitence of oxygen vacancy in Ca(Li1/3Nb2/3)O3-δ ceramics may induce their application for Base-metal MLCC, but the relationship between phase compositions and the structure is still not clear. In this paper, the phase relations of perovskite phase in Ca-Li-Nb-O system fired at 800oC are investigated. The results show the solid solution regions of 1:2 ordering perovskite structure in Ca(Li1/3Nb2/3)O3-δ- Ca(Li1/2Nb1/2)O3-δ-Ca4Nb2O9 system and the simple perovskite structure for Ca(Li1/4Nb3/4)O3 and Ca8/7(Li1/7Nb5/7)O3-δ phase. The dense ceramics are obtained for Ca(Li1/4Nb3/4)O3, Ca(Li1/3Nb2/3)O3-δ and Ca(Li1/2Nb1/2)O3-δ sintered in N2, where the dielectric constant～30 and the dielectric loss～10-3-10-4(at 1MHz)．
王凯、胡星、凌志远
电工材料
无机非金属材料钙钛矿有序
inorganic materialperovskiteordering
王凯,胡星,凌志远.缺陷型钙钛矿材料的成分及介电性能分析[EB/OL].(2011-02-21)[2025-08-02].http://www.paper.edu.cn/releasepaper/content/201102-489.点此复制
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