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A New Low‐Loss Microwave Dielectric Ceramic Sr 4 LaTiNb 3 O 15
Author(s) -
Fang Liang,
Su Heping,
Yu Qian,
Zhang Hui,
Wu Bolin
Publication year - 2008
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2008.02520.x
Subject(s) - ceramic , dielectric , trigonal crystal system , temperature coefficient , materials science , microwave , hexagonal crystal system , analytical chemistry (journal) , dielectric loss , mineralogy , perovskite (structure) , crystallography , crystal structure , chemistry , composite material , optoelectronics , physics , chromatography , quantum mechanics
A high dielectric constant and low‐loss ceramic with composition Sr 4 LaTiNb 3 O 15 has been prepared by the conventional solid‐state ceramic route. This compound adopts an A 5 B 4 O 15 cation‐deficient hexagonal perovskite structure and crystallizes in the trigonal system with unit cell parameters a =5.6307(2), c =11.3692(3) Å, V =312.16(2) Å 3 , and Z =1. The dielectric properties of dense ceramics sintered in air at 1460°C have been characterized at microwave frequencies. The results show that the material affords a relatively high dielectric constant ɛ r ∼43, a high quality factor Q × f ∼44 718 GHz, and a low temperature coefficient of resonant frequency TC f ∼13 ppm/°C.