Dielectric relaxation of protonic defects in hydrated and dehydrated SrZrO3:Yb |
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| Affiliation: | 1. School of Resources and Environmental Engineering, Wuhan University of Technology, 122 Luoshi Road, Hongshan, Wuhan, Hubei 430070, PR China;2. State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, 122 Luoshi Road, Hongshan, Wuhan, Hubei 430070, PR China;3. Center for Information Materials, Department of Materials Science and Engineering, Pohang University of Science and Technology (POSTECH), San 31, Hyoja-dong, Pohang, Gyeongbuk 790-784, Republic of Korea;4. China Building Material Institute of Solar-Energy Application, Zhenjiang, Jiangsu 212009, PR China;1. Institut des Molécules et Matériaux du Mans, UMR CNRS 6283, Université du Maine, Av. O. Messiaen, 72085 Le Mans cedex 09, France;2. Laboratoire de Chimie Inorganique, Université de Sfax, Faculté des Sciences de Sfax, BP 1171, 3000 Sfax, Tunisia;3. Laboratoire de Photonique d''Angers, Université d''Angers, 2 Bd. Lavoisier, 49045 Angers cedex 01, France;4. Laboratoire de Physique Appliquée, Groupe des Matériaux Luminescents, Université de Sfax, Faculté des Sciences de Sfax, BP 1171, 3000 Sfax, Tunisia |
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| Abstract: | Dielectric relaxations of proton conductor Yb-doped SrZrO3 have been measured as a function of temperature and frequency in different pretreatments with water vapor. Well defined two relaxation peaks were observed in the compounds doped with more than 1 mol% of Yb irrespective of annealing in WET (hydrate) or DRY (dehydrate) conditions. These two relaxations can be assigned to reorientations of Yb-proton dipole at an isolated [YbO6]-octahedron and at a [YbO6]–[YbO6]–... cluster in the SrZrO3 crystal (i.e. effectively negative charged Yb and positive charged proton). By DRY pretreatment, the magnitude of the dipole strength was almost fixed for the isolated Yb-proton dipole, while the magnitude became significantly decreased for the dipole associated with the Yb-cluster. It shows the proton associated with the isolated Yb is more stable than that with the Yb-cluster. |
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