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EPR studies of Mo<sup>3+</sup> ion in single crystals of NH <inf>4</inf>AI(SO<inf>4</inf>)<inf>2</inf>·12H<inf>2</inf>O
Date Issued
01-01-1976
Author(s)
Radhakrishna, S.
Chowdah, B. V.R.
Viswanath, A. Kasi
Abstract
Electron paramagnetic resonance studies of Mo3+ ion in NH 4A1(SO4)2·12H2O single crystals are made at X-band frequencies and at room temperature. It is found that there are four magnetically inequivalent complexes of Mo3+ ion in the lattice which exhibit trigonal symmetry. The angular variation of the fine structure lines is studied in the crystallographic (111) and (100) planes. The z axes of the complexes are found to be along the (111) directions. The spectra are analyzed using the fine structure spin Hamiltonian and the parameters are found to be g1 =1.974, g- = 2.009, and D = 506.8X10-4 cm-1. Paramagnetic resonance of the polycrystalline samples is also studied and the usual spin-Hamiltonian analysis is made. A model is proposed for the position of the Mo3+ ion in the lattice of ammonium alum. Copyright © 1977 American Institute of Physics.
Volume
66