Conductivity and Structural Investigations in Lacunary Pb6Ca2Li2(PO4)6 Apatite |
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| Authors: | Thouraya NaddariJean-Michel Savariault Hafed El FekiPhilippe Salles Abdelhamid Ben Salah |
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| Institution: | a Laboratoire des Sciences des Matériaux et Environnement, Faculté des Sciences de SFAX, BP 802, 3018 SFAX, Tunisiab Centre d'Elaboration de Matériaux et d'Etudes Structurales, 29 rue J. Marvig, BP 4347, 31055, Toulouse Cedex 4, France |
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| Abstract: | Prismatic crystals of Pb6Li2Ca2(PO4)6 were obtained by solid-state reaction. They were characterized by IR spectroscopy and chemical analyses. The structure as determined by X-ray diffraction study on single crystal revealed that the compound is isostructural to the hexagonal phase Pb8Na2(PO4)6. Crystal data for Pb6Li2Ca2(PO4)6: space group P63/m (No. 176), a=b=9.6790(15) Å, c=7.1130(7), Z=1, R=0.039. In the compound, lithium was found to preferentially occupy the site (I) and the structure is stabilized by interactions between electron lone pairs of lead (II) ions. Electrical conductivity measured in a wide range of temperature is governed by a hopping mechanism of Li ions in tunnels. |
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| Keywords: | lead apatite single crystals lithium IR spectroscopy structure electrical conductivity |
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