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Structural studies and Raman spectroscopy of forbidden zone boundary phonons in Ni‐doped ZnO ceramics
Author(s) -
Yadav Harish Kumar,
Sreenivas K.,
Gupta Vinay,
Katiyar R. S.
Publication year - 2009
Publication title -
journal of raman spectroscopy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.748
H-Index - 110
eISSN - 1097-4555
pISSN - 0377-0486
DOI - 10.1002/jrs.2136
Subject(s) - raman spectroscopy , wurtzite crystal structure , phonon , materials science , raman scattering , doping , antiferromagnetism , spectroscopy , condensed matter physics , phase (matter) , phase boundary , analytical chemistry (journal) , crystallography , chemistry , zinc , optics , physics , optoelectronics , organic chemistry , quantum mechanics , chromatography , metallurgy
We present X‐ray diffraction and Raman spectroscopy studies of Ni‐doped ZnO (Zn 1− x Ni x O, x = 0.0, 0.03, 0.06, and 0.10) ceramics prepared by solid‐state reaction technique. The presence of the secondary phase along with the wurtzite phase is observed in Ni‐doped ZnO samples. The E 2 (low) optical phonon mode is seen to be shifted to a lower wavenumber with Ni incorporation in ZnO and is explained on the basis of force‐constant variation of ZnO bond with Ni incorporation. A zone boundary phonon is observed in Ni‐doped samples at ∼130 cm −1 which is normally forbidden in the first‐order Raman scattering of ZnO. Antiferromagnetic ordering between Ni atoms via spin‐orbit mechanism at low temperatures (100 K) is held responsible for the observed zone boundary phonon. Copyright © 2008 John Wiley & Sons, Ltd.