Simultaneous surface and bulk crystallization of Bi1.5ZnNb1.5O7-type pyrochlores and related crystals in glasses

被引：4

作者：

Shimamura, Keisuke ^{[1
]}

Honma, Tsuyoshi ^{[1
]}

Shinozaki, Kenji ^{[2
]}

Komatsu, Takayuki ^{[1
]}

机构：

[1] Nagaoka Univ Technol, Dept Mat Sci & Technol, Nagaoka, Niigata, Japan

[2] Natl Inst Adv Ind Sci & Technol, Osaka, Japan

来源：

INTERNATIONAL JOURNAL OF APPLIED GLASS SCIENCE | 2018年 / 9卷 / 02期

关键词：

Bi1; 5ZnNb1; 5O(7) pyrochlore; bulk crystallization; morphology; surface crystallization; DIELECTRIC-PROPERTIES; POLARIZABILITY; CERAMICS;

D O I：

10.1111/ijag.12343

中图分类号：

TQ174 [陶瓷工业]; TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

New glasses based on the systems of Bi2O3-ZnO-Nb2O5-B2O3 and -GeO2 were synthesized using a conventional melt-quenching method, and the formation behavior of pyrochlore-type Bi1.5ZnNb1.5O7 crystals was examined to develop new dielectric glass-ceramics. It was demonstrated that pyrochlore-type Bi1.5ZnNb1.5O7 crystals are formed in 15Bi(2)O(3)-20ZnO-15Nb(2)O(5)-50B(2)O(3) glass, ie, pseudo-binary Bi1.5ZnNb1.5O7-B2O3 glass. The formation of a new crystalline phase consisting of mainly Bi2O3 and Nb2O5 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 epsilon(r)=91 at f = 100 kHz, suggesting a potential for optoelectronic device applications.

引用

页码：296 / 304

页数：9

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