Influence of the common varistor dopants (CoO, Cr{sub 2}O{sub 3} and Nb{sub 2}O{sub 5}) on the structural properties of SnO{sub 2} ceramics
The influence of dopants commonly used in SnO{sub 2} varistor ceramics, such as CoO, Cr{sub 2}O{sub 3} or Nb{sub 2}O{sub 5}, on the structural properties of SnO{sub 2} was investigated. Several SnO{sub 2}-based ceramics containing only one of the dopants were prepared and characterized. Spectroscopic investigations [visible, near infrared (IR) and IR region] were performed to obtain information about dopants valence states inside the ceramics, as well as about their influence on electronic structure of the material. Structural properties were investigated by X-ray diffraction analysis and mechanisms of dopant incorporation were proposed. Obtained results were confirmed with results of the electrical measurements. Microstructural changes in doped ceramics were investigated by scanning electron microscopy (SEM) analysis that showed great differences in densities, grain size, and morphology of the SnO{sub 2} ceramics depending on type of dopants and their distribution.
- OSTI ID:
- 20748631
- Journal Information:
- Materials Characterization, Journal Name: Materials Characterization Journal Issue: 4-5 Vol. 52; ISSN 1044-5803; ISSN MACHEX
- Country of Publication:
- United States
- Language:
- English
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