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Crystallographic data about hydrated and anhydrous lithium monoborates

Published online by Cambridge University Press:  10 January 2013

E. Bétourné  and
M. Touboul
E. Bétourné
Affiliation:
Laboratoire de Réactivité et de Chimie des Solides, URA CNRS 1211, Université de Picardie Jules Verne, 33, rue Saint-Leu, 80039 Amiens Cedex, France
M. Touboul*
Affiliation:
Laboratoire de Réactivité et de Chimie des Solides, URA CNRS 1211, Université de Picardie Jules Verne, 33, rue Saint-Leu, 80039 Amiens Cedex, France
*
a)To whom all correspondence should be addressed; Electronic mail: marcel.touboul@sc.u-picardie.fr
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Abstract

The anhydrous and hydrated lithium monoborates have been studied. The most hydrated phase is LiBO2·8H2O; its structural formula in the P3 space group is Li(H2O)4B(OH)4·2H2O. Refinement of the cell parameters yielded the following results: a=6.5483(5) Å, c=6.1692(7) Å with F(30)=64(0.015, 32), Z=1, and Dx=1.402 g/cm3. This phase gives LiB(OH)4 by spontaneous dehydration. An X-ray powder diffraction study of LiB(OH)4 as a function of temperature indicated three poorly crystallized hydrates. Two of these hydrates have the formula LiBO2·0.3H2O; the other, LiBO2·xH2O, has an undetermined water content. Crystal data for α-LiBO2 have been obtained: a=5.8473(10) Å, b=4.3513(6) Å, c=6.4557(10) Å, β=115.08(1)°, F(27)=58.5(0.001, 41); space group P21/c, Z=4, and Dx=2.18 g/cm3. β-LiBO2 does not exist but corresponds to the α-LiBO2 form observed at 600 °C. Numerous other LiBO2 forms reported recently have not been found.

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Type
Research Article
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Powder Diffraction , Volume 12 , Issue 3 , September 1997 , pp. 155 - 159
Copyright
Copyright © Cambridge University Press 1997

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