EPR Study of Cu 2+ Doped Fast-Proton Conductor K 3 H(SO 4 ) 2 in the Temperature Range 100--450 K
A. Ostrowski, W. Bednarski and S. Waplak
Institute of Molecular Physics, Polish Academy of Sciences, Smoluchowskiego 17, 60-179 Poznań, Poland
Full Text PDF
Received: July 31, 2003; revised version October 14, 2003
The K 3 H(SO 4 ) 2 doped with Cu 2+ ion was studied in detail by X-band CW EPR. Two kinds of Cu 2+ complexes (magnetically and structurally nonequivalent) denoted as Cu 2+ (I) and Cu 2+ (II) were found. Spin-Hamiltonian parameters, direction cosines, and coordination of Cu 2+ ion were determined at room temperature. The superhyperfine structure was observed below 250 K as a result of interacting of Cu 2+ ion with four equivalent protons (I=1/2). Temperature studies of K 3 H(SO 4 ) 2 crystal show that interbond motion as a precursor of superprotonic phase transition occurs at above 250 K.
DOI: 10.12693/APhysPolA.104.549
PACS numbers: 61.50.--f, 76.30.--v