Journal
JOURNAL OF PHYSICS-CONDENSED MATTER
Volume 26, Issue 11, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0953-8984/26/11/115801
Keywords
EPR spectroscopy; ZnO varistors; doping
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Funding
- DFG grant [ER 662/1-1]
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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+ C EPR signal was strongly suppressed or masked by a Mn2+ C 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.
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