Raman spectroscopy and dielectric Studies of multiple phase transitions in ZnO:Ni

Yadav, Harish Kumar and Sreenivas, K. and Gupta, Vinay and Scott, J. F. and Katiyar, R. S. (2008) Raman spectroscopy and dielectric Studies of multiple phase transitions in ZnO:Ni. Applied Physics Letters, 92 (12). pp. 122908-3. DOI 10.1063/1.2902172

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Abstract

We present Raman and dielectric data on Ni-doped ZnO (Zn1−xNixO) ceramics as a function of Ni concentration (x=0.03, 0.06, and 0.10) and temperature. A mode (around 130 cm−1) is identified as TA(M) [J. M. Calleja and M. Cardona, Phys. Rev. B 16, 3753 (1977)] and appears due to an antiferromagnetic phase transition at low temperatures (100 K) via the spin-orbit mechanism [P. Moch and C. Dugautier, Phys. Lett. A 43, 169 (1973)]. A strong dielectric anomaly occurs at around 430–460 K, depending on Ni concentration, and is due to extrinsic electret effects (Ni ionic conduction) and not to a ferroelectric phase transition

Item Type: Article
Uncontrolled Keywords: 08AREP; IA57;
Subjects: 03 - Mineral Sciences
Divisions: 03 - Mineral Sciences
Journal or Publication Title: Applied Physics Letters
Volume: 92
Page Range: pp. 122908-3
Identification Number: 10.1063/1.2902172
Depositing User: Sarah Humbert
Date Deposited: 01 Jun 2009 13:14
Last Modified: 23 Jul 2013 09:55
URI: http://eprints.esc.cam.ac.uk/id/eprint/1053

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