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Phase transition and high-pressure behavior of ulexite, a potential aggregate in radiation-shielding concretes
https://orcid.org/0000-0001-6445-3736
https://orcid.org/0000-0001-6483-4205
https://orcid.org/0000-0003-2272-8281
https://orcid.org/0000-0003-1191-1363
https://orcid.org/0000-0002-8904-5461
Graphical abstract Display Omitted
Highlights Ulexite undergoes a phase transition between 6.6 and 7.1 GPa. The structure of ulexite-II has been solved. A dramatic anisotropic compressional scheme has been found. The P-stability range of ulexite exceeds the working conditions of aggregates in concretes.
Abstract The high-pressure behavior of ulexite [ideally NaCaB5O6(OH)6·5(H2O)], a B-bearing raw material (with B2O3 ≈ 43 wt%) and a potential B-rich aggregate, has been studied by in-situ single-crystal synchrotron X-ray diffraction up to 9.5 GPa, in order to explore its stability field at high pressure, the anisotropy of its compressional behavior and the deformation mechanisms at the atomic scale. Ulexite undergoes a first-order iso-symmetric phase transition, reconstructive in character, between 6.44 and 7.13 GPa (to the ulexite-II polymorph); the crystal structure of ulexite-II was successfully solved and refined. For the low-P polymorph of ulexite (stable in all the working conditions as aggregate in concretes), the isothermal bulk modulus here obtained is K V0 = 36.9(5) GPa, with a strongly anisotropic compressional pattern (finite-Eulerian principal components of the unit-strain ellipsoid: ε1:ε2:ε3 ∼7:3:1). Ulexite-II also shows a marked anisotropic compressional pattern and with a resulting bulk softening (K V0 = 26(4) GPa).
Phase transition and high-pressure behavior of ulexite, a potential aggregate in radiation-shielding concretes
https://orcid.org/0000-0001-6445-3736
https://orcid.org/0000-0001-6483-4205
https://orcid.org/0000-0003-2272-8281
https://orcid.org/0000-0003-1191-1363
https://orcid.org/0000-0002-8904-5461
Graphical abstract Display Omitted
Highlights Ulexite undergoes a phase transition between 6.6 and 7.1 GPa. The structure of ulexite-II has been solved. A dramatic anisotropic compressional scheme has been found. The P-stability range of ulexite exceeds the working conditions of aggregates in concretes.
Abstract The high-pressure behavior of ulexite [ideally NaCaB5O6(OH)6·5(H2O)], a B-bearing raw material (with B2O3 ≈ 43 wt%) and a potential B-rich aggregate, has been studied by in-situ single-crystal synchrotron X-ray diffraction up to 9.5 GPa, in order to explore its stability field at high pressure, the anisotropy of its compressional behavior and the deformation mechanisms at the atomic scale. Ulexite undergoes a first-order iso-symmetric phase transition, reconstructive in character, between 6.44 and 7.13 GPa (to the ulexite-II polymorph); the crystal structure of ulexite-II was successfully solved and refined. For the low-P polymorph of ulexite (stable in all the working conditions as aggregate in concretes), the isothermal bulk modulus here obtained is K V0 = 36.9(5) GPa, with a strongly anisotropic compressional pattern (finite-Eulerian principal components of the unit-strain ellipsoid: ε1:ε2:ε3 ∼7:3:1). Ulexite-II also shows a marked anisotropic compressional pattern and with a resulting bulk softening (K V0 = 26(4) GPa).
Phase transition and high-pressure behavior of ulexite, a potential aggregate in radiation-shielding concretes
https://orcid.org/0000-0001-6445-3736
https://orcid.org/0000-0001-6483-4205
https://orcid.org/0000-0003-2272-8281
https://orcid.org/0000-0003-1191-1363
https://orcid.org/0000-0002-8904-5461
Graphical abstract Display Omitted
Highlights Ulexite undergoes a phase transition between 6.6 and 7.1 GPa. The structure of ulexite-II has been solved. A dramatic anisotropic compressional scheme has been found. The P-stability range of ulexite exceeds the working conditions of aggregates in concretes.
Abstract The high-pressure behavior of ulexite [ideally NaCaB5O6(OH)6·5(H2O)], a B-bearing raw material (with B2O3 ≈ 43 wt%) and a potential B-rich aggregate, has been studied by in-situ single-crystal synchrotron X-ray diffraction up to 9.5 GPa, in order to explore its stability field at high pressure, the anisotropy of its compressional behavior and the deformation mechanisms at the atomic scale. Ulexite undergoes a first-order iso-symmetric phase transition, reconstructive in character, between 6.44 and 7.13 GPa (to the ulexite-II polymorph); the crystal structure of ulexite-II was successfully solved and refined. For the low-P polymorph of ulexite (stable in all the working conditions as aggregate in concretes), the isothermal bulk modulus here obtained is K V0 = 36.9(5) GPa, with a strongly anisotropic compressional pattern (finite-Eulerian principal components of the unit-strain ellipsoid: ε1:ε2:ε3 ∼7:3:1). Ulexite-II also shows a marked anisotropic compressional pattern and with a resulting bulk softening (K V0 = 26(4) GPa).
Phase transition and high-pressure behavior of ulexite, a potential aggregate in radiation-shielding concretes
Comboni, Davide (Autor:in) / Pagliaro, Francesco (Autor:in) / Gatta, G. Diego (Autor:in) / Lotti, Paolo (Autor:in) / Battiston, Tommaso (Autor:in) / Merlini, Marco (Autor:in) / Hanfland, Michael (Autor:in)
24.03.2021
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
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