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Topotaxy relationships in the transformation phosgenite-cerussite

Pina Martínez, Carlos Manuel and Fernández Díaz, Lourdes and Prieto Rubio, Manuel (1996) Topotaxy relationships in the transformation phosgenite-cerussite. Journal of Crystal Growth , 158 . pp. 340-345. ISSN 0022-0248

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Abstract

The crystallization of phosgenite (Pb2ClzCO 3) and cerussite (PbCO 3) has been carried out by counter diffusion in a silica
hydrogel at 25°C. The crystallization of both phases is strongly controlled by the pH of the medium. Under certain
conditions the physicochemical evolution of the system determines that phosgenite crystals become unstable and transform
into cerussite. The transformation is structurally controlled and provides an interesting example of topotaxy. The
orientational relationships are (110)ph║[001]cer, (110)ph ║[100]cer, and (001)ph ║(010)cer. In this paper, a study of the
topotactic transformation and the crystal morphology is worked out. The topotactic relationships are interpreted on the
ground of geometrical and structural considerations.

Item Type:Article
Uncontrolled Keywords:Crystallization; Phosgenite; Cerussite
Subjects:Sciences > Geology > Crystallography
ID Code:14548
Deposited On:09 Feb 2012 10:32
Last Modified:09 Feb 2012 10:32

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