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Electron paramagnetic resonance study of ZnO varistor material

Baraki, Raschid and Zierep, Paul and Erdem, Emre and Weber, Stefan and Granzow, Torsten (2014):
Electron paramagnetic resonance study of ZnO varistor material.
In: Journal of Physics: Condensed Matter, pp. 115801(1-6), 26, (11), ISSN 0953-8984,
[Online-Edition: http://dx.doi.org/10.1088/0953-8984/26/11/115801],
[Article]

Abstract

Matsuoka-type zinc oxide (ZnO) varistor material was synthesized using a conventional solid-state reaction method. X-band electron paramagnetic resonance (EPR) data revealed that Mn ions substitute in the ZnO lattice with a 2+ paramagnetic state. Co ions with either 3+ or 2+ oxidation states are only detectable at cryogenic temperatures. A Cr3+ EPR signal was strongly suppressed or masked by a Mn2+ signal. Photoluminescence and electrical results indicated that the varistor sample has fewer intrinsic defects and much higher resistivity as compared to undoped and metal-ion doped ZnO.

Item Type: Article
Erschienen: 2014
Creators: Baraki, Raschid and Zierep, Paul and Erdem, Emre and Weber, Stefan and Granzow, Torsten
Title: Electron paramagnetic resonance study of ZnO varistor material
Language: English
Abstract:

Matsuoka-type zinc oxide (ZnO) varistor material was synthesized using a conventional solid-state reaction method. X-band electron paramagnetic resonance (EPR) data revealed that Mn ions substitute in the ZnO lattice with a 2+ paramagnetic state. Co ions with either 3+ or 2+ oxidation states are only detectable at cryogenic temperatures. A Cr3+ EPR signal was strongly suppressed or masked by a Mn2+ signal. Photoluminescence and electrical results indicated that the varistor sample has fewer intrinsic defects and much higher resistivity as compared to undoped and metal-ion doped ZnO.

Journal or Publication Title: Journal of Physics: Condensed Matter
Volume: 26
Number: 11
Uncontrolled Keywords: EPR spectroscopy, ZnO varistors, doping
Divisions: 11 Department of Materials and Earth Sciences > Material Science > Nonmetallic-Inorganic Materials
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences
Date Deposited: 04 Mar 2014 09:12
Official URL: http://dx.doi.org/10.1088/0953-8984/26/11/115801
Identification Number: doi:10.1088/0953-8984/26/11/115801
Funders: This work has been financed by the DFG grant ER 662/1-1.
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