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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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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:24 Sep 2015 06:38

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