The compressional behaviour of inyoite, ideally CaB3O3(OH)5·4H2O, has been studied by an in-situ high-pressure single-crystal X-ray experiment, at the ESRF large-scale facility, up to 19.80(5) GPa. Inyoite undergoes a first-order phase transition to inyoite-II, bracketed between 8.25(5) and 8.86(5) GPa, with a large volume discontinuity (ΔV ⁓ 7.5%). The structure of the high-pressure polymorph has not been solved due to a significant decrease in the number of Bragg reflections. The isothermal bulk modulus (KV0 = β−1P0,T0, where βP0,T0 is the volume compressibility coefficient) of inyoite was found to be KV0 = 26.9(8) GPa, whereas in inyoite-II, the KV0 value increases to 52(5) GPa. The increase of the bulk modulus is paired with a sharp decrease of the anisotropy of compressibility, as shown by the magnitude of the Eulerian finite unit-strain ellipsoid with: ε1:ε2:ε3 = 3.5:2.1:1 in inyoite and ε1:ε2:ε3 = 1.5:1.1:1 in inyoite-II. The P-induced deformation mechanisms controlling, at the atomic scale, the bulk compression of inyoite are here described on the basis of a series of structure refinements.

High-pressure behaviour and atomic-scale deformation mechanisms in inyoite, CaB₃O₃(OH)₅·4H₂O [High-pressure behaviour and atomic-scale deformation mechanisms in inyoite, CaB3O3(OH)(5)center dot 4H(2)O] / D. Comboni, T. Battiston, F. Pagliaro, P. Lotti, G.D. Gatta, M. Hanfland. - In: PHYSICS AND CHEMISTRY OF MINERALS. - ISSN 0342-1791. - 49:2(2022 Feb), pp. 4.1-4.10. [10.1007/s00269-021-01173-3]

High-pressure behaviour and atomic-scale deformation mechanisms in inyoite, CaB₃O₃(OH)₅·4H₂O [High-pressure behaviour and atomic-scale deformation mechanisms in inyoite, CaB3O3(OH)(5)center dot 4H(2)O]

T. Battiston
Secondo
Membro del Collaboration Group
;
F. Pagliaro
Membro del Collaboration Group
;
P. Lotti
Writing – Review & Editing
;
G.D. Gatta
Penultimo
Writing – Review & Editing
;
2022

Abstract

The compressional behaviour of inyoite, ideally CaB3O3(OH)5·4H2O, has been studied by an in-situ high-pressure single-crystal X-ray experiment, at the ESRF large-scale facility, up to 19.80(5) GPa. Inyoite undergoes a first-order phase transition to inyoite-II, bracketed between 8.25(5) and 8.86(5) GPa, with a large volume discontinuity (ΔV ⁓ 7.5%). The structure of the high-pressure polymorph has not been solved due to a significant decrease in the number of Bragg reflections. The isothermal bulk modulus (KV0 = β−1P0,T0, where βP0,T0 is the volume compressibility coefficient) of inyoite was found to be KV0 = 26.9(8) GPa, whereas in inyoite-II, the KV0 value increases to 52(5) GPa. The increase of the bulk modulus is paired with a sharp decrease of the anisotropy of compressibility, as shown by the magnitude of the Eulerian finite unit-strain ellipsoid with: ε1:ε2:ε3 = 3.5:2.1:1 in inyoite and ε1:ε2:ε3 = 1.5:1.1:1 in inyoite-II. The P-induced deformation mechanisms controlling, at the atomic scale, the bulk compression of inyoite are here described on the basis of a series of structure refinements.
Inyoite; High-pressure; Borates; Single-crystal X-ray diffraction;
Settore GEO/09 - Georisorse Miner.Appl.Mineral.-Petrogr.per l'amb.e i Beni Cul
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2434/898884
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