Hydrothermal synthesis and sintering of electroceramics

被引：11

作者：

Dias, A

Buono, VTL

Ciminelli, VST

Moreira, RL

机构：

[1] Univ Fed Minas Gerais, EE, Dept Mat & Met Engn, BR-30160030 Belo Horizonte, MG, Brazil

[2] Univ Fed Minas Gerais, ICEx, Dept Fis, BR-30123970 Belo Horizonte, MG, Brazil

来源：

JOURNAL OF THE EUROPEAN CERAMIC SOCIETY | 1999年 / 19卷 / 6-7期

关键词：

hydrothermal processing; powders; chemical preparation; sintering; porosity; dielectric properties;

D O I：

10.1016/S0955-2219(98)00366-5

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：

The hydrothermal processing of ultrafine Pb-1.88(Zn0.3Nb1.25)O-5.305 and Ba(Mg0.33Nb0.67)O-3 powders as well as their sintering behavior at 1000 degrees C were investigated. The morphological analyses on nanometric powders indicated the presence of mesopores in micrometric agglomerates with open cylindrical pores. High dielectric constants were observed, showing normal frequency dispersion and an intrinsic ac relaxation, relatively masked by low frequency conductivity. The sintered ceramics presented lower dielectric permittivities than the hydrothermal powders, and a classical Cole-Cole plot could be obtained for the Pb-1.88(Zn0.3Nb1.25) O-5.305 electroceramic for frequencies above 10(3) Hz. (C) 1999 Elsevier Science Limited. All rights reserved.

引用

页码：1027 / 1031

页数：5

共 19 条

[11]

International Union of Crystallography, 1985, INT TABL XRAY CRYS 3, P318

[12] THE UNIVERSAL DIELECTRIC RESPONSE AND ITS PHYSICAL SIGNIFICANCE [J].