Modelling of the humidity effect on the barrier height in SnO2 varistors

I. Skuratovsky; A. Glot; E. Traversa

doi:10.1016/j.mseb.2005.11.039

Modelling of the humidity effect on the barrier height in SnO₂ varistors

I. Skuratovsky, A. Glot^*, E. Traversa

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

9 Scopus citations

Abstract

Tin dioxide based SnO₂-Bi₂O₃-Co ₃O₄-Nb₂O₅-Cr₂O ₃ ceramic device with combined varistor and humidity-sensitive properties is studied. This varistor-sensor has high humidity sensitivity coefficient of about 420 at low electric field and high non-linearity coefficient of about 50 at electric field 3500 V cm^-1. Current-voltage characteristics of the samples with separate electrodes for the central and the peripheral parts are studied in air with different relative humidity. It is shown that current through the peripheral part of a sample is increased much stronger than through the central part. The observed increase of low-field current on relative humidity is explained by the decrease of the barrier height. The estimations of the lowering of the barrier height in a humid air is performed using the suggested models.

Original language	English (US)
Pages (from-to)	130-137
Number of pages	8
Journal	Materials Science and Engineering B: Solid-State Materials for Advanced Technology
Volume	128
Issue number	1-3
DOIs	https://doi.org/10.1016/j.mseb.2005.11.039
State	Published - Mar 15 2006
Externally published	Yes

Keywords

Electrical measurements
Electron conduction
Grain boundaries
Sensors
Tin dioxide ceramics
Varistors

ASJC Scopus subject areas

General Materials Science
Condensed Matter Physics
Mechanics of Materials
Mechanical Engineering

Access to Document

10.1016/j.mseb.2005.11.039

Cite this

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title = "Modelling of the humidity effect on the barrier height in SnO2 varistors",

abstract = "Tin dioxide based SnO2-Bi2O3-Co 3O4-Nb2O5-Cr2O 3 ceramic device with combined varistor and humidity-sensitive properties is studied. This varistor-sensor has high humidity sensitivity coefficient of about 420 at low electric field and high non-linearity coefficient of about 50 at electric field 3500 V cm-1. Current-voltage characteristics of the samples with separate electrodes for the central and the peripheral parts are studied in air with different relative humidity. It is shown that current through the peripheral part of a sample is increased much stronger than through the central part. The observed increase of low-field current on relative humidity is explained by the decrease of the barrier height. The estimations of the lowering of the barrier height in a humid air is performed using the suggested models.",

keywords = "Electrical measurements, Electron conduction, Grain boundaries, Sensors, Tin dioxide ceramics, Varistors",

author = "I. Skuratovsky and A. Glot and E. Traversa",

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T1 - Modelling of the humidity effect on the barrier height in SnO2 varistors

AU - Skuratovsky, I.

AU - Glot, A.

AU - Traversa, E.

PY - 2006/3/15

Y1 - 2006/3/15

N2 - Tin dioxide based SnO2-Bi2O3-Co 3O4-Nb2O5-Cr2O 3 ceramic device with combined varistor and humidity-sensitive properties is studied. This varistor-sensor has high humidity sensitivity coefficient of about 420 at low electric field and high non-linearity coefficient of about 50 at electric field 3500 V cm-1. Current-voltage characteristics of the samples with separate electrodes for the central and the peripheral parts are studied in air with different relative humidity. It is shown that current through the peripheral part of a sample is increased much stronger than through the central part. The observed increase of low-field current on relative humidity is explained by the decrease of the barrier height. The estimations of the lowering of the barrier height in a humid air is performed using the suggested models.

AB - Tin dioxide based SnO2-Bi2O3-Co 3O4-Nb2O5-Cr2O 3 ceramic device with combined varistor and humidity-sensitive properties is studied. This varistor-sensor has high humidity sensitivity coefficient of about 420 at low electric field and high non-linearity coefficient of about 50 at electric field 3500 V cm-1. Current-voltage characteristics of the samples with separate electrodes for the central and the peripheral parts are studied in air with different relative humidity. It is shown that current through the peripheral part of a sample is increased much stronger than through the central part. The observed increase of low-field current on relative humidity is explained by the decrease of the barrier height. The estimations of the lowering of the barrier height in a humid air is performed using the suggested models.

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KW - Electron conduction

KW - Grain boundaries

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KW - Tin dioxide ceramics

KW - Varistors

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