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Microwave Dielectrics in the (La 1/2 Na 1/2 )TiO 3 –Ca(Fe 1/2 Nb 1/2 )O 3 System
Author(s) -
Kim HyunJai,
Kucheiko Sergey,
Yoon SeokJin,
Jung HyungJin
Publication year - 1997
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.1151-2916.1997.tb02986.x
Subject(s) - dielectric , microwave , materials science , temperature coefficient , analytical chemistry (journal) , sintering , ceramic , perovskite (structure) , mineralogy , crystallography , chemistry , optoelectronics , metallurgy , physics , composite material , chromatography , quantum mechanics
Dielectric properties of the system (1 − x)(La 1/2 Na 1/2 )TiO 3 – x Ca(Fe 1/2 Nb 1/2 )O 3 , where 0.4 # x # 0.6, have been investigated at microwave frequencies. The temperature coefficient of resonant frequency (τ f ), nearly 0 ppm/°C, was realized at x = 0.58. These ceramics had perovskite structure and showed relatively low dielectric losses. A new dielectric material applicable to microwave devices having Q · f of 12000–14000 GHz and a dielectric constant (ε r ) of 59–60 has been obtained at 1300–1350°C for 5–15 h sintering.