Crystal Structure, Mössbauer Spectra, Thermal Expansion, and Phase Transition of Berthierite FeSb₂S₄

Authors: Lstrok ukaszewicz K.¹; Pietraszko A.¹; St eogon pie nacute -Damm J.¹; Kajokas A.²; Grigas J.²; Drulis H.¹

Source: Journal of Solid State Chemistry, Volume 162, Number 1, November 2001 , pp. 79-83(5)

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Abstract:

Dielectric and ultrasound measurements of berthierite FeSb₂S₄ reported in the literature revealed a phase transition at T_c=348 K. In the present study the phase transition was confirmed by Mössbauer spectra exhibiting anomalous behavior close to 350 K. Precise lattice parameters measured in the temperature region 305–380 K show a change of slope at about 350 K. The crystal structure of FeSb₂S₄ has been determined using single-crystal X-ray diffraction data at both room temperature and 370 K above the phase transition. The crystal structure is orthorhombic, Z=4. At 295 K a=11.412(2) Å, b=3.763(1) Å, c=14.161(3) Å, and R=0.0280, and at 370 K a=11.421(2) Å, b=3.771(1) Å, c=14.173(3) Å, and R=0.0274. No symmetry change has been observed. At both temperatures the space group of FeSb₂S₄ is Pnma with small changes in atomic parameters and interatomic distances. The transition observed at 348 K is, therefore, to be classified as a weak phase transition going on without essential changes in the crystal structure. Copyright 2001 Elsevier Science.

Keywords: FeSb₂S₄; berthierite; Mö; ssbauer spectra; thermal expansion; crystal structure; weak phase transition.

Language: English

Document Type: Research article

Affiliations: 1: Institute of Low Temperature and Structure Research, Polish Academy of Sciences, Okólna 2, Wroc lstrok aw, 250-422, Poland aw, 250-422, Poland "> 2: Department of Physics, University of Vilnius, Sauletekio al. 9/3, Vilnius, 2040, Lithuania