The crystal structure of chalcostibite α-CuSbS2 was investigated at pressures between 0 and 13.2 GPa by synchrotron single-crystal X-ray diffraction, compressing the sample under neon in a diamond anvil cell. The volume-pressure data, collected up to 10.7 GPa, were fitted to a third-order Birch-Murnaghan Equation-of-State, yielding V0 = 332.4(4) Å3, K0 = 49(3) GPa, and K′ = 6.9 (9). The compressibilities of the lattice parameters, up to 10.7 GPa, were calculated by fitting the data to a second-order Birch-Murnaghan EoS for a and b axes and the following values were found: K0a = 49.0(6) GPa, a0 = 6.02(2) Å, K0b = 76 (3) GPa, b0 = 3.80 (8) Å. For the c axis a third-order Birch-Murnaghan EoS was used yielding to : K0c = 33 (3) GPa, K' = 15(2), c0 = 14.51(1) Å. At pressures higher than 11 GPa the evolution of the crystal lattice and geometrical parameters of the crystal structure indicate a phase transition from an orthorhombic Pnma to a monoclinic P21 structure. The single crystal survives the reversible phase transition despite the contraction of the unit cell of 2.2 vol% and the anisotropic change of the lattice parameters, which affects mainly the a lattice parameter. The lone electron pair stereo-chemical activity of Sb decreases with pressure as was evaluated by the reduction of the coordination-polyhedron eccentricity. The crystal structure of the high pressure β-CuSbS2 was refined in the acentric P21 space group. Pressure induces shear planes in the crystal structure. The coordination number of Cu increases from four (tetrahedral) to five (square pyramidal). At the same time, the Sb coordination changes towards a distorted octahedral with a strong reduction of the stereochemical activity of Sb lone-electron pair and a movement of its centre closer to the Sb nucleus.
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Research Article|
May 01, 2018
A high-pressure phase transition in chalcostibite, CuSbS2
Paola Comodi;
1
Dipartimento di Fisica e Geologia, University of Perugia
, Perugia, Italy
Corresponding author: e-mail: [email protected]
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Francesco Guidoni;
Francesco Guidoni
1
Dipartimento di Fisica e Geologia, University of Perugia
, Perugia, Italy
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Sabrina Nazzareni;
Sabrina Nazzareni
1
Dipartimento di Fisica e Geologia, University of Perugia
, Perugia, Italy
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Tonci Balić-Žunić;
Tonci Balić-Žunić
2
Department of Geosciences and Natural Resource Management, University of Copenhagen
, Copenhagen, Denmark
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Azzurra Zucchini;
Azzurra Zucchini
1
Dipartimento di Fisica e Geologia, University of Perugia
, Perugia, Italy
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Emil Makovicky;
Emil Makovicky
2
Department of Geosciences and Natural Resource Management, University of Copenhagen
, Copenhagen, Denmark
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Vitali Prakapenka
Vitali Prakapenka
3
APS synchrotron, Argonne
, Chicago, USA
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Francesco Guidoni
1
Dipartimento di Fisica e Geologia, University of Perugia
, Perugia, Italy
Sabrina Nazzareni
1
Dipartimento di Fisica e Geologia, University of Perugia
, Perugia, Italy
Tonci Balić-Žunić
2
Department of Geosciences and Natural Resource Management, University of Copenhagen
, Copenhagen, Denmark
Azzurra Zucchini
1
Dipartimento di Fisica e Geologia, University of Perugia
, Perugia, Italy
Emil Makovicky
2
Department of Geosciences and Natural Resource Management, University of Copenhagen
, Copenhagen, Denmark
Vitali Prakapenka
3
APS synchrotron, Argonne
, Chicago, USA
Corresponding author: e-mail: [email protected]
Publisher: Deutsche Mineralogische Gesellschaft, Sociedad Española de Mineralogia, Societá Italiana di Mineralogia e Petrologia, Société Francaise de Minéralogie
Received:
12 Jul 2017
Revision Received:
21 Sep 2017
Accepted:
30 Sep 2017
First Online:
14 May 2018
Online ISSN: 1617-4011
Print ISSN: 0935-1221
© 2018 E. Schweizerbart'sche Verlagsbuchhandlung, D-70176 Stuttgart
European Journal of Mineralogy (2018) 30 (3): 491–505.
Article history
Received:
12 Jul 2017
Revision Received:
21 Sep 2017
Accepted:
30 Sep 2017
First Online:
14 May 2018
Citation
Paola Comodi, Francesco Guidoni, Sabrina Nazzareni, Tonci Balić-Žunić, Azzurra Zucchini, Emil Makovicky, Vitali Prakapenka; A high-pressure phase transition in chalcostibite, CuSbS2. European Journal of Mineralogy 2018;; 30 (3): 491–505. doi: https://doi.org/10.1127/ejm/2018/0030-2728
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Index Terms/Descriptors
- antimony
- anvil cells
- chalcostibite
- compressibility
- compression
- coordination
- copper
- crystal structure
- crystal systems
- eccentricity
- high pressure
- lattice
- lattice parameters
- metals
- monoclinic system
- orthorhombic system
- phase transitions
- polymorphism
- pressure
- sulfantimonites
- sulfosalts
- symmetry
- synchrotron radiation
- transformations
- X-ray diffraction data
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