Colossal permittivity and low losses in Ba1-xSrxTiO3-δ reduced nanoceramics

被引：23

作者：

Dupuis, Sebastien ^{[1
]}

Sulekar, Soumitra ^{[2
]}

Kim, Ji Hyun ^{[2
]}

Han, Hyuksu ^{[1
,3
]}

Dufour, Pascal ^{[1
]}

Tenailleau, Christophe ^{[1
]}

Nino, Juan Claudio ^{[2
]}

Guillemet-Fritsch, Sophie ^{[1
]}

机构：

[1] Univ Toulouse 3, CNRS, Inst Camot CIRIMAT, UMR 5085,INP, F-31062 Toulouse 9, France

[2] Univ Florida, Dept Mat Sci & Engn, Gainesville, FL 32611 USA

[3] Korea Inst Ind Technol KITECH, Gangneung Si 25440, Gangwon Do, South Korea

来源：

JOURNAL OF THE EUROPEAN CERAMIC SOCIETY | 2016年 / 36卷 / 03期

关键词：

Barium strontium titanate; Colossal permittivity; Spark plasma sintering; Nanoceramic; Dielectric properties; BARIUM-STRONTIUM-TITANATE; HIGH-DIELECTRIC-CONSTANT; GRAIN-SIZE; CERAMICS; PHASE; MICROSTRUCTURE; OXYGEN; ROUTE; FILMS;

D O I：

10.1016/j.jeurceramsoc.2015.10.017

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 oxalate route offers a controlled approach to synthesize pure Ba1-xSrxTiO3 (BST) (0 <= x <= 1) nanopartides (phi approximate to 150 nm in diameter). Reduced BST dense nanoceramics were obtained by spark plasma sintering (SPS) and then annealed for a short time to reach colossal permittivity (is an element of'r = 10(5)) with low dielectric losses (tan delta = 0.03) at 1 kHz and 300 K. The effects of Ba-Sr substitution on structural, microstructural and electrical properties were analyzed. Comprehensive analysis of the electrical properties indicates that polaron hopping, mediated by Ti3+ ions and oxygen vacancies is the main contributing mechanism to colossal permittivity in Ba-rich BST compounds. Substitution of Ba by Sr reduced the contribution of polaron hopping and led to a decrease of real and imaginary parts of permittivity, while preserving interfacial polarization and yielding better temperature stability. The lowest temperature coefficient of capacitance, or TCC (variation of capacitance between 310K and 450 K) value, i.e., 44 ppm K-1, is obtained for SrTiO3. (C) 2015 Elsevier Ltd. All rights reserved.

引用

页码：567 / 575

页数：9

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