EPR evidence for local pseudo freeze out of impurity dynamics in KH<sub>2</sub>PO<sub>4</sub> type ferroelectrics and antiferroelectrics期刊界 All Journals 搜尽天下杂志传播学术成果专业期刊搜索期刊信息化学术搜索

EPR evidence for local pseudo freeze out of impurity dynamics in KH₂PO₄ type ferroelectrics and antiferroelectrics

Authors:	N.S. Dalal R. Blinc P. Prelovšek A.H. Reddoch

Affiliation:	Department of Chemistry, West Virginia University, Morgantown, WV 26506, USA;J. Stefan Institute, E. Kardelj University of Ljubljana, Ljubljana, Yogoslavia;Chemistry Division, National Research Council, Ottawa, K1A OR6, Canada

Abstract:	The temperature dependence of the reorientation rates of the AsO₄^4? centers in KH₂AsO₄ and NH₄H₂AsO₄ as well as of the CrO₄^3? centers in KH₂PO₄ shows a strong deviation from an Arrhenius behavior which can be quantitatively described as a result of the local “pseudo freeze-out” of the dynamics of these centers and the associated polarization cloud far above the transition temperature T_C of the host crystal.

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