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Fluorine mobility in the aluminum doped CeF₃ crystal: NMR and conductivity studies

Tien C.¹, Charnaya E.V.^1,2, Sherman A.B.³

¹Department of Physics, National Cheng Kung University, Tainan Taiwan

²Institute of Physics, St. Petersburg State University, St. Petersburg Russia
³A.F. Ioffe Physical-Technical Institute, Russian Academy of Sciences, St. Petersburg, Russia Ioffe Institute, St. Petersburg, Russia

Email: charnaya@mail.ru

Поступила в редакцию: 11 февраля 2004 г.

Выставление онлайн: 20 августа 2004 г.

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Electrical conductivity and NMR measurements were carried out for the aluminum doped CeF₃ crystal to study influence of substitutional impurities on the superionic fluorine mobility. Activation enthalpy was found to remain constant from low temperatures to about 325 K while it increased compared to that of the pure CeF₃ crystal. Above about 325 K a trand towards gradual conductivity saturation was observed, this change was ascribed to a superionic phase transition, which was not accompanied with structural transformations. NMR also revealed some alterations in local fluorine dynamics compared to that reported for the pure CeF₃ crystal. According to NMR measurements, the superionic phase transition near 325 K results in acceleration of the exchange between rigid or slow fluorine in the F₁, F₂ and F₃ sublattices while highly mobile F₁ fluorine ions move independently at least until 400 K. The present work was supported by the National Science Council of Taiwan under Grant 92-2811-M-006-014.

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