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X-ray diffraction evidence for a monoclinic form of stibnite, Sb₂S₃, below 290 K

¹ Interdisciplinary Graduate School of Science and Engineering, Tokyo Institute of Technology, 4259 Nagatsuta, Midori-ku, Yokohama 226-8502, Japan
² Ceramics Research Laboratory, Nagoya Institute of Technology, Asahigaoka, Tajimi 507-0071, Japan
³ Center for Advanced Materials Analysis, Tokyo Institute of Technology, 2-12-1 Oookayama, Meguro-ku, Tokyo 152-8550, Japan
⁴ Department of Mineralogy, South Australian Museum, North Terrace, Adelaide, South Australia 5000, Australia

Correspondence: ^* E-mail: ishizawa{at}nitech.ac.jp

The nature of the symmetry changes associated with phase transitions in stibnite, Sb₂S₃, has been investigated by powder and single crystal X-ray diffraction. Above 420 K stibnite (I) is centrosymmetric Pbnm. Stibnite (II) is stable between 290 and 420 K and is acentric P2₁nm. Below 290 K stibnite (III) is stable and systematic absences indicates that this phase is monoclinic with space group P2₁ or Pm, or triclinic P1, but the cell dimensions remain geometrically orthorhombic. These findings are in agreement with variations in physical and electrical properties reported in the literature.