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Simultaneous surface and bulk crystallization of Bi 1.5 ZnNb 1.5 O 7 ‐type pyrochlores and related crystals in glasses
Author(s) -
Shimamura Keisuke,
Honma Tsuyoshi,
Shinozaki Kenji,
Komatsu Takayuki
Publication year - 2018
Publication title -
international journal of applied glass science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.383
H-Index - 34
eISSN - 2041-1294
pISSN - 2041-1286
DOI - 10.1111/ijag.12343
Subject(s) - materials science , pyrochlore , crystallization , dielectric , phase (matter) , quenching (fluorescence) , analytical chemistry (journal) , mineralogy , crystallography , type (biology) , crystal (programming language) , chemical engineering , optics , optoelectronics , fluorescence , chemistry , engineering , ecology , physics , organic chemistry , chromatography , computer science , biology , programming language
New glasses based on the systems of Bi 2 O 3 ‐ZnO‐Nb 2 O 5 ‐B 2 O 3 and ‐GeO 2 were synthesized using a conventional melt‐quenching method, and the formation behavior of pyrochlore‐type Bi 1.5 ZnNb 1.5 O 7 crystals was examined to develop new dielectric glass‐ceramics. It was demonstrated that pyrochlore‐type Bi 1.5 ZnNb 1.5 O 7 crystals are formed in 15Bi 2 O 3 ‐20ZnO‐15Nb 2 O 5 ‐50B 2 O 3 glass, ie, pseudo‐binary Bi 1.5 ZnNb 1.5 O 7 ‐B 2 O 3 glass. The formation of a new crystalline phase consisting of mainly Bi 2 O 3 and Nb 2 O 5 was detected in 15Bi 2 O 3 ‐20ZnO‐15Nb 2 O 5 ‐50GeO 2 glass, in which a simultaneous crystallization of new crystals with different morphologies was found at the surface and in the inside of the glass. The crystallized sample of 21Bi 2 O 3 ‐28ZnO‐21Nb 2 O 5 ‐30GeO 2 glass exhibited the dielectric constant of ε r =91 at f = 100 kH z, suggesting a potential for optoelectronic device applications.