Degradation of oxide varistor ceramics in air atmosphere containing NO2 at elevated temperatures

Alexander Glot; Elisabetta Di Bartolomeo; Aleksei Gaponov; Riccardo Polini; Enrico Traversa

doi:10.1016/S0955-2219(03)00416-3

Degradation of oxide varistor ceramics in air atmosphere containing NO₂ at elevated temperatures

Alexander Glot, Elisabetta Di Bartolomeo, Aleksei Gaponov, Riccardo Polini^*, Enrico Traversa

^*Corresponding author for this work

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

3 Scopus citations

Abstract

The heat treatment of commercial zinc oxide based varistor ceramics at temperatures of 200-300 °C in air with 1000 ppm of NO₂ causes strong shift of voltage-current characteristic (VCC) to low voltages. Subsequent exposure to pure air leads to partial restoration of VCC. Scanning electron microscopy analysis showed microstructural changes of samples after heat treatment in air with 1000 ppm of NO₂. Chemical reactions between NO₂ molecules and oxygen chemisorbed or Bi-rich oxide phases at grain boundaries followed by the lowering of grain boundary potential barriers can be the reason of observed degradation.

Original language	English (US)
Pages (from-to)	1213-1216
Number of pages	4
Journal	Journal of the European Ceramic Society
Volume	24
Issue number	6
DOIs	https://doi.org/10.1016/S0955-2219(03)00416-3
State	Published - Jun 2004
Externally published	Yes

Keywords

Grain boundary
NO
Sensors
Varistors
ZnO

ASJC Scopus subject areas

Ceramics and Composites
Materials Chemistry

Access to Document

10.1016/S0955-2219(03)00416-3

Cite this

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title = "Degradation of oxide varistor ceramics in air atmosphere containing NO2 at elevated temperatures",

abstract = "The heat treatment of commercial zinc oxide based varistor ceramics at temperatures of 200-300 °C in air with 1000 ppm of NO2 causes strong shift of voltage-current characteristic (VCC) to low voltages. Subsequent exposure to pure air leads to partial restoration of VCC. Scanning electron microscopy analysis showed microstructural changes of samples after heat treatment in air with 1000 ppm of NO2. Chemical reactions between NO2 molecules and oxygen chemisorbed or Bi-rich oxide phases at grain boundaries followed by the lowering of grain boundary potential barriers can be the reason of observed degradation.",

keywords = "Grain boundary, NO, Sensors, Varistors, ZnO",

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T1 - Degradation of oxide varistor ceramics in air atmosphere containing NO2 at elevated temperatures

AU - Glot, Alexander

AU - Di Bartolomeo, Elisabetta

AU - Gaponov, Aleksei

AU - Polini, Riccardo

AU - Traversa, Enrico

PY - 2004/6

Y1 - 2004/6

N2 - The heat treatment of commercial zinc oxide based varistor ceramics at temperatures of 200-300 °C in air with 1000 ppm of NO2 causes strong shift of voltage-current characteristic (VCC) to low voltages. Subsequent exposure to pure air leads to partial restoration of VCC. Scanning electron microscopy analysis showed microstructural changes of samples after heat treatment in air with 1000 ppm of NO2. Chemical reactions between NO2 molecules and oxygen chemisorbed or Bi-rich oxide phases at grain boundaries followed by the lowering of grain boundary potential barriers can be the reason of observed degradation.

AB - The heat treatment of commercial zinc oxide based varistor ceramics at temperatures of 200-300 °C in air with 1000 ppm of NO2 causes strong shift of voltage-current characteristic (VCC) to low voltages. Subsequent exposure to pure air leads to partial restoration of VCC. Scanning electron microscopy analysis showed microstructural changes of samples after heat treatment in air with 1000 ppm of NO2. Chemical reactions between NO2 molecules and oxygen chemisorbed or Bi-rich oxide phases at grain boundaries followed by the lowering of grain boundary potential barriers can be the reason of observed degradation.

KW - Grain boundary

KW - NO

KW - Sensors

KW - Varistors

KW - ZnO

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