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Journal of Structural Chemistry

2008 year, number 5

epr study of the nature of the impurity centers responsible for the scintillation proeprties of the Li2Zn2(MoO4)3 crystal

V. A. Nadolinnyi, N. V. Chernei, A. V. Sinitsyn, A. A. Pavlyuk, S. F. Solodovnikov
Keywords: EPR, X-ray analysis, scintillator, copper ions, EPR spectrum modeling
Pages: 891-895

Abstract

The binary molybdate Li2Zn2(MoO4)3 of a new crystal type was characterized by EPR, optical spectroscopy, and X-ray diffraction methods. The crystals have the Pnma symmetry group and the lattice parameters а = 5.1139(5) Е, b = 10.4926(13) Е, c = 17.6445(22) Е; Z = 4. The crystals possess scintillation properties; emission is caused by the presence of impurity levels in the forbidden band. The EPR studies of the nature of the impurity centers responsible for the scintillation characteristics of the crystal showed that the centers were Cu2+ ions substituted for zinc ions in the oxygen octahedra. The directions of the main values of the g and А tensors (gzz, Azz) correspond to the direction of O-Cu-O of the oxygen octahedron distorted along the Z axis. The EPR spectra of the copper ions are described by the spin Hamiltonian with the parameters g|| = 2.38, g = 2.06; A|| = 116 G, А = 0 G.