Structural, Dielectric and Electrical Properties of La2O3 Doped SrTiO3 Ceramics

被引：0

作者：

Naidu, K. Chandra Babu ^{[1
]}

Sarmash, T. Sofi ^{[1
]}

Reddy, V. Narasimha ^{[1
]}

Maddaiah, M. ^{[1
]}

Reddy, P. Sreenivasula ^{[1
]}

Subbarao, T. ^{[1
]}

机构：

[1] Sri Krishnadevaraya Univ, Dept Phys, Mat Sci Lab, Anantapuramu 515003, Andhra Pradesh, India

来源：

JOURNAL OF THE AUSTRALIAN CERAMIC SOCIETY | 2015年 / 51卷 / 01期

关键词：

X-ray diffractometer (XRD); Dielectric constant; thermoelectric power; ac-conductivity;

D O I：

暂无

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：

Ceramic samples of La2O3-doped SrTiO3 have been synthesized via conventional solid-state reaction under the calcination and sintering conditions of 1000 degrees C and 1150 degrees C for 12hrs and 4 hrs respectively. The phase transition has been observed at temperature T-c= 270 degrees C revealing the cubic to tetragonal phase transformation. At room temperature (RT) sample have showed good dielectric constant of 57.5(0.1 kHz) and 23.1(5MHz) and decreasing at the elevated frequencies during the variation of 0.1 kHz to 5MHz. Dielectric loss (tan delta) at RT has been measured as 0.373 (0.1kHz) and 0.115 (5MHz). Thermoelectric power (S) and ac-conductivity (sigma(ac)) studies have been performed and both n-type and p-type conduction has been observed in TEP (thermoelectric power) plots. Cubic symmetry of the sample has been indicated in the X-ray powder diffraction study. Apart the samples have been characterized by FE-SEM and EDAX for micro structural and elemental analysis respectively.

引用

页码：94 / 102

页数：9

共 14 条

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