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Study of new rare earth family Pb1.6K1.2R0.2Nb5O15 (R=La, Nd, Sm, Eu and Gd) of tetragonal tungsten bronze-type ferroelectrics |
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| Authors: | M Oualla M Elaatmani M Daoud D Mezzane I Luk'yanchuk A Zegzouti |
| Institution: | a Laboratory of Mineral Solid State Chemistry, Faculty of Sciences, University Cadi Ayyad, Bd. My Abdallah, BP 2390, Marrakech, Morocco b Faculty of Sciences and Technics, University Cadi Ayyad, BP 549, Marrakech, Morocco c University of Picardy Jules Verne, Laboratory of Condensed Matter Physics, 33 rue Saint Leu, 80039, Amiens Cedex 01, France |
| Abstract: | A new ferroelectric rare earth family Pb1.6K1.2R0.2Nb5O15 with R=La, Nd, Sm, Eu and Gd (PKRN) of tetragonal tungsten bronze type ferroelectrics was synthesized. The ferroelectric transition with nonuniform distribution of critical temperature over a ceramic sample was found from dielectric measurements. According to X-ray diffraction measurements, the ferroelectric phase has an orthorhombic symmetry. The transition temperature was shown to decrease weakly with increasing radius of the rare earth ion R. |
| Keywords: | A Ferroelectrics A Oxides B Solid-state reaction C X-ray diffraction |
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