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EPR Spectra of Some Cu

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EPR Spectra of Some Cu

2+

-Doped Metal Carbonates and Disorder Phase Transition in K

3

H(CO

3

)

2

Dilek Demir, Fevzi K¨oksal, Canan Kazak, and Rahmi K¨oseo ˘glu

Department of Physics, Faculty of Arts and Sciences, Ondokuz Mayıs University, Samsun, Turkey Reprint requests to F. K.; E-mail: fkoksal@omu.edu.tr

Z. Naturforsch.64a,123 – 126 (2009); received December 3, 2007 / revised June 6, 2008

Cu2+-doped K3H(CO3)2, Rb2CO3, and Rb2KH(CO3)2single crystals were investigated by elec- tron paramagnetic resonance (EPR) spectroscopy. The EPR spectrum of K3H(CO3)2indicates two different sites for Cu2+at room and at low temperatures. But the signals for the two sites overlap at 318 K which is attributed to a disorder phase transition. Each of the other compounds exhibits one site. The Cu2+ion seems to substitute the K+and Rb+ions and the charge compensations are fulfilled by the proton vacancies in K3H(CO3)2, and another K+and Rb+in the other compounds.

The spin Hamiltonian parametersgandAfor each compound are determined and discussed.

Key words:Electron Paramagnetic Resonance; Carbonates; Disorder Phase Transition;

Cu2+Doping.

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