Characterisation of Zn3(VO4)2 phases in V2O5-doped ZnO varistors

Huey Hoon Hng; Kevin M. Knowles

doi:10.1016/s0955-2219(98)00303-3

Characterisation of Zn₃(VO₄)₂ phases in V₂O₅-doped ZnO varistors

Huey Hoon Hng^*, Kevin M. Knowles

^*Corresponding author for this work

University of Cambridge

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

65 Citations (Scopus)

Abstract

Zinc oxide-rich ZnO-V₂O₅ (ZV), ZnO-V₂O₅-MnO₂ (ZVM) and ZnO-V₂O₅-Sb₂O₃ (ZVS) polycrystalline ceramics have been prepared for detailed microstructural and electrical characterisation. All samples exhibit non-linear current-voltage behaviour, with non-linear coefficients ranging from 5·0 for ZV to 16·7 for ZVM. The use of X-ray powder diffraction together with microstructural examination by transmission electron microscopy and a comparison of measured interplanar spacings with those quoted in the literature for α-, β- and γ-Zn₃(VO₄)₂, has shown evidence for the formation of β-Zn₃(VO₄)₂ in ZV, γ-Zn₃(VO₄)₂ in ZVM and α-Zn₃(VO₄)₂ in ZVS. The Zn₃(VO₄)₂ phases are found to exist as smaller grains embedded in ZnO grains or residing at triple junctions. Electron diffraction suggests that β-Zn₃(VO₄)₂ has an orthorhombic A lattice, while γ-Zn₃(VO₄)₂ has a monoclinic C lattice.

Original language	English
Pages (from-to)	721-726
Number of pages	6
Journal	Journal of the European Ceramic Society
Volume	19
Issue number	6-7
DOIs	https://doi.org/10.1016/s0955-2219(98)00303-3
Publication status	Published - Jun 1999
Externally published	Yes

ASJC Scopus Subject Areas

Ceramics and Composites
Materials Chemistry

Keywords

Electron microscopy
Microstructure-final
Varistors
Zn(VO)
ZnO

Access to Document

10.1016/s0955-2219(98)00303-3

Cite this

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title = "Characterisation of Zn3(VO4)2 phases in V2O5-doped ZnO varistors",

abstract = "Zinc oxide-rich ZnO-V2O5 (ZV), ZnO-V2O5-MnO2 (ZVM) and ZnO-V2O5-Sb2O3 (ZVS) polycrystalline ceramics have been prepared for detailed microstructural and electrical characterisation. All samples exhibit non-linear current-voltage behaviour, with non-linear coefficients ranging from 5·0 for ZV to 16·7 for ZVM. The use of X-ray powder diffraction together with microstructural examination by transmission electron microscopy and a comparison of measured interplanar spacings with those quoted in the literature for α-, β- and γ-Zn3(VO4)2, has shown evidence for the formation of β-Zn3(VO4)2 in ZV, γ-Zn3(VO4)2 in ZVM and α-Zn3(VO4)2 in ZVS. The Zn3(VO4)2 phases are found to exist as smaller grains embedded in ZnO grains or residing at triple junctions. Electron diffraction suggests that β-Zn3(VO4)2 has an orthorhombic A lattice, while γ-Zn3(VO4)2 has a monoclinic C lattice.",

keywords = "Electron microscopy, Microstructure-final, Varistors, Zn(VO), ZnO",

author = "Hng, {Huey Hoon} and Knowles, {Kevin M.}",

year = "1999",

month = jun,

doi = "10.1016/s0955-2219(98)00303-3",

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T1 - Characterisation of Zn3(VO4)2 phases in V2O5-doped ZnO varistors

AU - Hng, Huey Hoon

AU - Knowles, Kevin M.

PY - 1999/6

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N2 - Zinc oxide-rich ZnO-V2O5 (ZV), ZnO-V2O5-MnO2 (ZVM) and ZnO-V2O5-Sb2O3 (ZVS) polycrystalline ceramics have been prepared for detailed microstructural and electrical characterisation. All samples exhibit non-linear current-voltage behaviour, with non-linear coefficients ranging from 5·0 for ZV to 16·7 for ZVM. The use of X-ray powder diffraction together with microstructural examination by transmission electron microscopy and a comparison of measured interplanar spacings with those quoted in the literature for α-, β- and γ-Zn3(VO4)2, has shown evidence for the formation of β-Zn3(VO4)2 in ZV, γ-Zn3(VO4)2 in ZVM and α-Zn3(VO4)2 in ZVS. The Zn3(VO4)2 phases are found to exist as smaller grains embedded in ZnO grains or residing at triple junctions. Electron diffraction suggests that β-Zn3(VO4)2 has an orthorhombic A lattice, while γ-Zn3(VO4)2 has a monoclinic C lattice.

AB - Zinc oxide-rich ZnO-V2O5 (ZV), ZnO-V2O5-MnO2 (ZVM) and ZnO-V2O5-Sb2O3 (ZVS) polycrystalline ceramics have been prepared for detailed microstructural and electrical characterisation. All samples exhibit non-linear current-voltage behaviour, with non-linear coefficients ranging from 5·0 for ZV to 16·7 for ZVM. The use of X-ray powder diffraction together with microstructural examination by transmission electron microscopy and a comparison of measured interplanar spacings with those quoted in the literature for α-, β- and γ-Zn3(VO4)2, has shown evidence for the formation of β-Zn3(VO4)2 in ZV, γ-Zn3(VO4)2 in ZVM and α-Zn3(VO4)2 in ZVS. The Zn3(VO4)2 phases are found to exist as smaller grains embedded in ZnO grains or residing at triple junctions. Electron diffraction suggests that β-Zn3(VO4)2 has an orthorhombic A lattice, while γ-Zn3(VO4)2 has a monoclinic C lattice.

KW - Electron microscopy

KW - Microstructure-final

KW - Varistors

KW - Zn(VO)

KW - ZnO

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