Paramagnetic resonance studies of Cu2+ doped in NH4Br

Dattatreya Sastry, M. ; Venkateswarlu, Putcha (1967) Paramagnetic resonance studies of Cu2+ doped in NH4Br Proceedings of the Indian Academy of Sciences, Section A, 66 (4). pp. 208-221. ISSN 0370-0089

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Electron Paramagnetic Resonance studies of Cu2+ doped in NH4Br single crystals have been carried out for the first time. The room temperature data reveal that Cu2+ ions go predominantly to interstitial sites having square planar co-ordination of four Br- ions. For this type of complexes the bromine: superhyperfine structure: is observed on the normal hyperfine structure lines of copper. Existence of other weak spectra indicates that a relatively few Cu++ ions go substitutionally to (NH4)+ ions, and are probably associated with a first or a second nearest neighbour cation vacancy, among the two, the latter being more predominant. However, the low temperature studies corresponding to the tetragonal phase of NH4Br indicate that a number of Cu2+ ions at interstitial sites get readjusted to the lattice sites after phase transformation. The spectra in both the phases are analysed by the usual spin Hamiltonian method.

Item Type:Article
Source:Copyright of this article belongs to Indian Academy of Sciences.
ID Code:68651
Deposited On:02 Nov 2011 10:45
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