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Sol–Gel Processing and Microwave Characteristics of Ba(Mg ⅓ Ta ⅔ )O 3 Dielectrics
Author(s) -
Renoult Olivier,
Boilot JeanPierre,
Chaput Frédéric,
Papiernik Renée,
HubertPfalzgraf Liliane G.,
Lejeune Martine
Publication year - 1992
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.1151-2916.1992.tb04430.x
Subject(s) - dielectric , materials science , barium hydroxide , barium , perovskite (structure) , ceramic , alkoxide , sol gel , crystallization , sintering , analytical chemistry (journal) , trigonal crystal system , phase (matter) , mineralogy , microwave , hydroxide , inorganic chemistry , crystallography , chemistry , crystal structure , metallurgy , nanotechnology , catalysis , physics , optoelectronics , organic chemistry , chromatography , quantum mechanics , biochemistry
The sol–gel method has been developed for the preparation of pure Ba(Mg 1/3 Ta 2/3 )O 3 ceramics. This involves the reaction of the heterometallic alkoxide Ta 2 Mg(OEt) 12 with hydrated barium hydroxide Ba(OH) 2 ·8H 2 O. Complete crystallization of the sol–gel‐derived powder is achieved at 600°C, leading to a cubic perovskite type phase. After sintering at 1400°C (2–5 h), a trigonal cell arises from Mg–Ta ordering (the degree of order is greater than 0.9), and about 98.5% of the theoretical density is obtained. Preliminary microwave dielectric measurements show that the dielectric constant and the unloaded Q u of the ceramics are 24.2 and 6750, respectively, at 7.7 GHz.