Varistor property of SnO2·CoO·Ta2O5 ceramic modified by barium and strontium

S. R. Dhage; V. Ravi; O. B. Yang

doi:10.1016/j.jallcom.2007.11.062

Varistor property of SnO₂·CoO·Ta₂O₅ ceramic modified by barium and strontium

S. R. Dhage^*
, V. Ravi
, O. B. Yang

^*Corresponding author for this work

Division of Chemical Engineering

Research output: Contribution to journal › Journal article › peer-review

17 Scopus citations

Abstract

The influence of an alkali earth (Ba/Sr) element in small quantities (<1 at.%) on non-linear electrical properties of 98.5% SnO₂ + 1% CoO + 0.5% Ta₂O₅ (all in at.%) varistor system has been investigated. The non-linear coefficient increases from 33 to 52 whereas breakdown field strength varies 5025-6050 V cm^-1 for the barium-doped samples. In case of strontium-doped specimens moderate increase in non-linear coefficient but significant increase in breakdown field is observed. It is proposed that due to ionic size misfit, Ba and Sr segregates to grain boundaries thereby modifying their barrier properties. The contribution from grain boundary phase to the electrical property is confirmed by the impedance analysis.

Original language	English
Pages (from-to)	483-487
Number of pages	5
Journal	Journal of Alloys and Compounds
Volume	466
Issue number	1-2
DOIs	https://doi.org/10.1016/j.jallcom.2007.11.062
State	Published - 2008.10.20

Keywords

Oxide materials
Scanning electron microscopy
Sintering

Quacquarelli Symonds(QS) Subject Topics

Materials Science
Engineering - Mechanical

Access to Document

10.1016/j.jallcom.2007.11.062

Cite this

@article{284eea8e45df4c5d91bbb78bfc795531,

title = "Varistor property of SnO2·CoO·Ta2O5 ceramic modified by barium and strontium",

abstract = "The influence of an alkali earth (Ba/Sr) element in small quantities (<1 at.\%) on non-linear electrical properties of 98.5\% SnO2 + 1\% CoO + 0.5\% Ta2O5 (all in at.\%) varistor system has been investigated. The non-linear coefficient increases from 33 to 52 whereas breakdown field strength varies 5025-6050 V cm-1 for the barium-doped samples. In case of strontium-doped specimens moderate increase in non-linear coefficient but significant increase in breakdown field is observed. It is proposed that due to ionic size misfit, Ba and Sr segregates to grain boundaries thereby modifying their barrier properties. The contribution from grain boundary phase to the electrical property is confirmed by the impedance analysis.",

keywords = "Oxide materials, Scanning electron microscopy, Sintering",

author = "Dhage, \{S. R.\} and V. Ravi and Yang, \{O. B.\}",

year = "2008",

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doi = "10.1016/j.jallcom.2007.11.062",

language = "English",

volume = "466",

pages = "483--487",

journal = "Journal of Alloys and Compounds",

issn = "0925-8388",

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TY - JOUR

T1 - Varistor property of SnO2·CoO·Ta2O5 ceramic modified by barium and strontium

AU - Dhage, S. R.

AU - Ravi, V.

AU - Yang, O. B.

PY - 2008/10/20

Y1 - 2008/10/20

N2 - The influence of an alkali earth (Ba/Sr) element in small quantities (<1 at.%) on non-linear electrical properties of 98.5% SnO2 + 1% CoO + 0.5% Ta2O5 (all in at.%) varistor system has been investigated. The non-linear coefficient increases from 33 to 52 whereas breakdown field strength varies 5025-6050 V cm-1 for the barium-doped samples. In case of strontium-doped specimens moderate increase in non-linear coefficient but significant increase in breakdown field is observed. It is proposed that due to ionic size misfit, Ba and Sr segregates to grain boundaries thereby modifying their barrier properties. The contribution from grain boundary phase to the electrical property is confirmed by the impedance analysis.

AB - The influence of an alkali earth (Ba/Sr) element in small quantities (<1 at.%) on non-linear electrical properties of 98.5% SnO2 + 1% CoO + 0.5% Ta2O5 (all in at.%) varistor system has been investigated. The non-linear coefficient increases from 33 to 52 whereas breakdown field strength varies 5025-6050 V cm-1 for the barium-doped samples. In case of strontium-doped specimens moderate increase in non-linear coefficient but significant increase in breakdown field is observed. It is proposed that due to ionic size misfit, Ba and Sr segregates to grain boundaries thereby modifying their barrier properties. The contribution from grain boundary phase to the electrical property is confirmed by the impedance analysis.

KW - Oxide materials

KW - Scanning electron microscopy

KW - Sintering

UR - https://www.scopus.com/pages/publications/50649122715

U2 - 10.1016/j.jallcom.2007.11.062

DO - 10.1016/j.jallcom.2007.11.062

M3 - Journal article

AN - SCOPUS:50649122715

SN - 0925-8388

VL - 466

SP - 483

EP - 487

JO - Journal of Alloys and Compounds

JF - Journal of Alloys and Compounds

IS - 1-2

ER -