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Melting Properties of Bi 2 O 3 ‐ZnO‐Nb 2 O 5 ‐Based Dielectric Ceramics
Author(s) -
Wei Jianzhong,
Zhang Liangying,
Yao Xi
Publication year - 1999
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.1151-2916.1999.tb02119.x
Subject(s) - pyrochlore , phase (matter) , melting point , materials science , differential thermal analysis , dielectric , quenching (fluorescence) , analytical chemistry (journal) , ceramic , fluorite , crystallography , thermodynamics , mineralogy , chemistry , metallurgy , composite material , optics , fluorescence , diffraction , physics , optoelectronics , organic chemistry , chromatography
Cubic‐pyrochlore‐structure α‐phase and low‐symmetry‐structure ß‐phase are the basic phases of dielectric ceramics that are based on Bi 2 O 3 ‐ZnO‐Nb 2 O 5 (BZN). In this paper, the melting behaviors of the α‐phase and the ß‐phase have been explored using differential thermal analysis and X‐ray diffractometry. The results show that BZN‐based α‐phase is a congruent compound; its congruent melting point is 1190°C. BZN‐based ß‐phase is an incongruent compound that dissociates to form α‐phase and a liquid phase, with an absorption of heat, at its incongruent melting point (peritectic temperature) of 1100°C. Upon cooling, the α‐phase reacts with the liquid phase to form the ß‐phase via peritectic reaction. Upon quenching, the BZN‐based cubic‐fluorite phase precipitates from the liquid phase.