Tl(2)CO(3) at 3.56 GPa.
The crystal structure of thallium carbonate, Tl(2)CO(3) (C2/m, Z = 4), is stable at least up to 3.56 GPa, as demonstrated by hydrostatic single-crystal X-ray diffraction measurements in a diamond anvil cell at room temperature. Our results contradict earlier observations from the literature, which found a structural phase transition for this compound at about 2 GPa. Under atmospheric conditions, all atoms except for one O atom reside on the mirror plane in the high-pressure structure. The compression mainly affects the part of the structure where the nonbonded electron lone pairs on the Tl(+) cations are located.
Grzechnik
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Departamento Física Materia Condensada, Facultad de Ciencia y Tecnología, Universidad del País Vasco, Apartado 644, E-48080 Bilbao, Spain. andrzej.grzechnik@ehu.es
Friese
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