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Microstructures and Microwave Dielectric Characteristics of CaRAlO 4 (R = Nd, Sm, Y) Ceramics with Tetragonal K 2 NiF 4 Structure
Author(s) -
Xiao Yang,
Chen Xiang Ming,
Liu Xiao Qiang
Publication year - 2004
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.1151-2916.2004.tb06373.x
Subject(s) - microstructure , tetragonal crystal system , ceramic , microwave , materials science , sintering , dielectric , analytical chemistry (journal) , mineralogy , crystal structure , crystallography , chemistry , metallurgy , optoelectronics , physics , chromatography , quantum mechanics
CaRAlO 4 (R = Nd, Sm, Y) ceramics with a K 2 NiF 4 structure were prepared by a solid‐state reaction approach, and their microwave dielectric characteristics were evaluated, along with their microstructures. Dense CaNdAlO 4 , CaSmAlO 4 , and CaYAlO 4 ceramics were obtained by sintering at 1425°–1500°C in air for 3 h, and good microwave dielectric characteristics were achieved: (1) ɛ= 18.2, Qf = 17 980 GHz, τ f =−52 ppm/°C for CaNdAlO 4 ; (2) ɛ= 18.2, Qf = 51 060 GHz, τ f =−3 ppm/°C for CaSmAlO 4 ; and (3) ɛ= 18.9, Qf = 39 960 GHz, τ f = 6 ppm/°C for CaYAlO 4 .