High‐pressure behaviour and phase transition of jadarite, a promising B and Li mineral commodity
Articolo
Data di Pubblicazione:
2022
Citazione:
High‐pressure behaviour and phase transition of jadarite, a promising B and Li mineral commodity / D. Comboni, T. Battiston, M.S. Rumsey, F. Pagliaro, P. Lotti, M. Hanfland, G.D. Gatta. - In: JOURNAL OF THE AMERICAN CERAMIC SOCIETY. - ISSN 0002-7820. - 105:11(2022 Nov), pp. 7011-7021. [10.1111/jace.18659]
Abstract:
The high-pressure behavior of a natural jadarite (ideally LiNaSiB3O7(OH),
a∼6.76 Å, b∼13.80Å, c∼7.69 Å, β=124.09◦, space group P21/c) has been studied
by in situ single-crystal and powder synchrotron X-ray diffraction up to 20 GPa,
with a diamond anvil cell and using He as a hydrostatic pressure-transmitting
fluid. Between 16.57(5) and 17.04(5) GPa, jadarite undergoes a first-order isosymmetric
phase transition, which is reconstructive in character, with a ΔV of
approximately -3%. The structure of the high-pressure polymorph was solved
and refined (to R1 ∼ 4%). The isothermal bulk modulus of the low-P polymorph
of jadarite is KV0 = 55.0(5) GPa (βV0 = 0.0182(2) GPa–1), and its P-derivative
is 3.84(9). The compressional anisotropy, derived along the three main crystallographic
directions, is modest, with βa0:βb0:βc0 = 1.23:1:1.23. The P-induced
deformation mechanisms at the atomic scale, which lead to phase transition, are
described.
Tipologia IRIS:
01 - Articolo su periodico
Keywords:
borates, high pressure, jadarite, lithium and boron commodity, phase transition, X-ray diffraction
Elenco autori:
D. Comboni, T. Battiston, M.S. Rumsey, F. Pagliaro, P. Lotti, M. Hanfland, G.D. Gatta
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