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EPR Study of VO

2+

Doped Diammonium Tricadmium Tetrakis (Sulfate) Pentahydrate [(NH

4

)

2

Cd

3

(SO

4

)

4

·5H

2

O] Single Crystals

˙Ibrahim Kartal, B¨unyamin Karabulut, and Esat Bozkurt

Ondokuz Mayıs University, Science and Art Faculty, Physics Department, 55139, Samsun, Turkey Reprint requests to ˙I. K.; E-mail: ikartal@omu.edu.tr

Z. Naturforsch.65a,347 – 352 (2010); received September 16, 2008 / revised March 19, 2009 Electron paramagnetic resonance (EPR) studies are carried out on vanadyl (VO2+) ions in diammo- nium tricadmium tetrakis (sulfate) pentahydrate single crystals at room temperature. The EPR spectra of a single crystal exhibit resonance signals characteristic to VO2+ions. The analysis of EPR spectra indicates that the VO2+ions in single crystals show two magnetically inequivalent VO2+sites in distinct orientations occupying substitutional positions in the lattice and showing very high angular dependence. They form in octahedral coordination with tetragonal compression withC4vsymmetry.

The spin Hamiltonian parameters are determined, and these parameters have been used to estimate the bonding coefficients of the VO2+ion in a diammonium tricadmium tetrakis (sulfate) pentahydrate lattice. The parallel and perpendicular components of axially symmetricgand hyperfine (A) tensors are evaluated and the results are discussed and compared with previous reports.

Key words:EPR; ESR; Vanadyl Ion; Single Crystal.

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