In:
Journal of the American Ceramic Society, Wiley, Vol. 105, No. 11 ( 2022-11), p. 7011-7021
Abstract:
The high‐pressure behavior of a natural jadarite (ideally LiNaSiB 3 O 7 (OH), a ∼ 6.76 Å, b ∼ 13.80 Å, c ∼ 7.69 Å, β = 124.09°, space group P 2 1 / 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 iso‐symmetric phase transition, which is reconstructive in character, with a Δ V of approximately ‐3%. The structure of the high‐pressure polymorph was solved and refined (to R 1 ∼ 4%). The isothermal bulk modulus of the low‐ P polymorph of jadarite is K V 0 = 55.0(5) GPa ( β V 0 = 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 β a 0 : β b 0 : β c 0 = 1.23:1:1.23. The P ‐induced deformation mechanisms at the atomic scale, which lead to phase transition, are described.
Type of Medium:
Online Resource
ISSN:
0002-7820
,
1551-2916
DOI:
10.1111/jace.v105.11
Language:
English
Publisher:
Wiley
Publication Date:
2022
detail.hit.zdb_id:
2008170-4
detail.hit.zdb_id:
219232-9
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