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1 Polish Journal of Chemistry

1 1999

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Crystal structure, thermal expansion, dielectric permittivity and phase transitions of Bi2S3

Łukaszewicz K., Stępień-Damm J., Pietraszko A., Kajokas A., Grigas J.

Polish Journal of Chemistry

1999

vol. 73 nr 3

541-546

The crystal structure of Bi2S3 both natural (bismuthinite) and synthetic, reported in the literature, was determined at ambient temperature in the non-polar space group Pbnm. Physical properties of Bi2S3 indicate, however, on the possible phase transitions both in yhe high and low temperature regions. Precise lattice parameters measured as a function of temperature have shown weak anomalies at 160 and 410 K. The phase transition above 400 K has been also confirmed by measurements of microwave dielectric permittivity along the c-axis. The crystal structure of Bi2S3 has been determined at 130, 295 and 460 K. At all three temperature the crystal structure was successfully refined in the space group Pbnm. The weak phase transitions observed in Bi2S3 apparently do not change the symmetry, or these changes are too small to be deducted at the present level of accuracy of the X-ray crystal structure determination.