Conductivity and Structural Investigations in Lacunary Pb6Ca2Li2(PO4)6 Apatite

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. Cry...

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Bibliographic Details
Published in:Journal of solid state chemistry 2002-06, Vol.166 (1), p.237-244
Main Authors: Naddari, Thouraya, Savariault, Jean-Michel, Feki, Hafed El, Salles, Philippe, Salah, Abdelhamid Ben
Format: Article
Language:English
Subjects:
Chemistry
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Condensed matter: structure, mechanical and thermal properties
Conductivity phenomena in semiconductors and insulators
electrical conductivity
Electronic transport in condensed matter
Exact sciences and technology
Inorganic chemistry and origins of life
Inorganic compounds
IR spectroscopy
lead apatite
lithium
Low-field transport and mobility
piezoresistance
Physics
Preparations and properties
Salts
single crystals
structure
Structure of solids and liquids
crystallography
Structure of specific crystalline solids
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Summary: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.
ISSN:0022-4596
1095-726X
DOI:10.1006/jssc.2002.9596