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

✍ Scribed by Thouraya Naddari; Jean-Michel Savariault; Hafed El Feki; Philippe Salles; Abdelhamid Ben Salah

Publisher
Elsevier Science
Year
2002
Tongue
English
Weight
375 KB
Volume
166
Category
Article
ISSN
0022-4596

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✦ Synopsis

Prismatic crystals of Pb 6 Li 2 Ca 2 (PO 4 ) 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 Pb 8 Na 2 (PO 4 ) 6 . Crystal data for Pb 6 Li 2 Ca 2 (PO 4 ) 6 : space group P63/m (No. 176), a ΒΌ b ΒΌ 9:6790(15) ( A, c ΒΌ 7:1130(7), Z ΒΌ 1; R ΒΌ 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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