High-pressure single-crystal synchrotron X-ray diffraction study of lillianite
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High-pressure single-crystal synchrotron X-ray diffraction study of lillianite. / Zucchini, Azzurra; Balic-Zunic, Tonci; Collings, Ines E.; Hanfland, Michael; Comodi, Paola.
I: American Mineralogist, Bind 107, Nr. 9, 2022, s. 1752-1759.Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
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TY - JOUR
T1 - High-pressure single-crystal synchrotron X-ray diffraction study of lillianite
AU - Zucchini, Azzurra
AU - Balic-Zunic, Tonci
AU - Collings, Ines E.
AU - Hanfland, Michael
AU - Comodi, Paola
PY - 2022
Y1 - 2022
N2 - In this paper, high-pressure data from a synchrotron X-ray diffraction study on a lillianite (Pb3Bi2S6) single crystal up to similar to 21 GPa are presented. A phase transition from lillianite (space group Bbmm, LP lillianite) to the high-pressure form beta-Pb3Bi2S6 (space group Pbnm, HP lillianite) was confirmed and bracketed between 4.90 and 4.92 GPa. The transition is reversible but of first-order with a hysteresis of similar to 2.8 GPa. It showed weak effects of pseudo-merohedral twinning that disappeared upon decompression, testifying to a full recovery of the single crystal of lillianite This makes lillianite an interesting shape-memory material.With a bulk modulus K-4.9 = 78(3) GPa and K' = 5.1(4), beta-Pb3Bi2S6 is markedly less compressible than lillianite [K-0 = 44(2) GPa, K' = 7(1)]. Compressional anisotropy increases markedly in beta-Pb3Bi2S6 with compressibility along the b axis [M-0b = 130(6) GPa and M-b' = 19(3) in lillianite, M-4.9b = 145(4) GPa and M-b' = 16.0(7) in beta-Pb3Bi2S6] significantly larger than that along the other two axes [M-0a = 118(5) GPa, M-a' = 21(3), M-0c = 139(12) GPa, and M-c' = 31(10) in lillianite, M-4.9a = 242(12) GPa, M-a' = 8(1), M-4.9c = 242(5) GPa, and M-c' = 29(1) in beta-Pb3Bi2S6].The behavior of lillianite at high pressure is an interesting case study in relation to non-quenchable ultrahigh-pressure phases likely occurring in the inner Earth, like post-perovskite MgSiO3, the oxide homologue N = 1 of the lillianite series. The beta-Pb3Bi2S6 structure, on the other hand, is the N = 3 homologue of the meneghinite series to which the higher-pressure modification of the post-perovskite structure also belongs (homologue N = 1). This makes the two forms of Pb3Bi2S6 potential equivalents of high- and ultrahigh-pressure Mg silicates that could occur both in the deep earth and in other rocky extrasolar planetary bodies.
AB - In this paper, high-pressure data from a synchrotron X-ray diffraction study on a lillianite (Pb3Bi2S6) single crystal up to similar to 21 GPa are presented. A phase transition from lillianite (space group Bbmm, LP lillianite) to the high-pressure form beta-Pb3Bi2S6 (space group Pbnm, HP lillianite) was confirmed and bracketed between 4.90 and 4.92 GPa. The transition is reversible but of first-order with a hysteresis of similar to 2.8 GPa. It showed weak effects of pseudo-merohedral twinning that disappeared upon decompression, testifying to a full recovery of the single crystal of lillianite This makes lillianite an interesting shape-memory material.With a bulk modulus K-4.9 = 78(3) GPa and K' = 5.1(4), beta-Pb3Bi2S6 is markedly less compressible than lillianite [K-0 = 44(2) GPa, K' = 7(1)]. Compressional anisotropy increases markedly in beta-Pb3Bi2S6 with compressibility along the b axis [M-0b = 130(6) GPa and M-b' = 19(3) in lillianite, M-4.9b = 145(4) GPa and M-b' = 16.0(7) in beta-Pb3Bi2S6] significantly larger than that along the other two axes [M-0a = 118(5) GPa, M-a' = 21(3), M-0c = 139(12) GPa, and M-c' = 31(10) in lillianite, M-4.9a = 242(12) GPa, M-a' = 8(1), M-4.9c = 242(5) GPa, and M-c' = 29(1) in beta-Pb3Bi2S6].The behavior of lillianite at high pressure is an interesting case study in relation to non-quenchable ultrahigh-pressure phases likely occurring in the inner Earth, like post-perovskite MgSiO3, the oxide homologue N = 1 of the lillianite series. The beta-Pb3Bi2S6 structure, on the other hand, is the N = 3 homologue of the meneghinite series to which the higher-pressure modification of the post-perovskite structure also belongs (homologue N = 1). This makes the two forms of Pb3Bi2S6 potential equivalents of high- and ultrahigh-pressure Mg silicates that could occur both in the deep earth and in other rocky extrasolar planetary bodies.
KW - Lillianite
KW - high-pressure
KW - synchrotron
KW - single-crystal X-ray diffraction
KW - phase transition
KW - shape-memory
KW - POST-PEROVSKITE PHASE
KW - ELASTIC PROPERTIES
KW - TRANSITION
KW - GALENOBISMUTITE
KW - COMPRESSION
KW - DISTORTION
KW - PB3BI2S6
KW - PBBI2S4
KW - SERIES
U2 - 10.2138/am-2021-7765
DO - 10.2138/am-2021-7765
M3 - Journal article
VL - 107
SP - 1752
EP - 1759
JO - American Mineralogist
JF - American Mineralogist
SN - 0003-004X
IS - 9
ER -
ID: 320877778