TY - JOUR

T1 - High-pressure structural behavior of α-K2Ca3(CO3)4 up to 20 GPa

AU - Ignatov, Mark A.

AU - Rashchenko, Sergey V.

AU - Likhacheva, Anna Yu

AU - Romanenko, Alexandr V.

AU - Shatskiy, Anton F.

AU - Arefiev, Anton V.

AU - Litasov, Konstantin D.

N1 - This work is financially supported by the joint RFBR-FWF grant project (#21-55-14001 and I 5046-N) and performed on state assignment of IGM SB RAS (No. 122041400176-0) and GEOKHI RAS. MAI acknowledge support by the strategic academic leadership program “Priority 2030” at the Novosibirsk State University. We acknowledge the European Synchrotron Radiation Facility (ESRF) for provision of synchrotron radiation facilities (proposal ES-1061) and we would like to thank Prof. Michael Hanfland and Davide Comboni for assistance and support in using beamline ID015b.

PY - 2024/9

Y1 - 2024/9

N2 - K-Ca double carbonates recently identified in inclusions in diamonds, as well as associated alkali-carbonate melts can play an important role in the deep carbon cycle. We studied pressure-induced changes in the crystal structure of high-pressure α-K2Ca3(CO3)4 phase up to 20 GPa using synchrotron single-crystal x-ray diffraction in diamond anvil cell. At ~ 7 GPa at room temperature the orthorhombic P212121 phase of α-K2Ca3(CO3)4 undergoes displacive phase transition into monoclinic P1121 phase. Despite the phase transition, PV-curve does not demonstrate any irregularities so that both phases can be described by the same 4th order Birch-Murnaghan equation of state with V0 = 1072.5(3) Å3, K0 = 51.1(8) GPa, K’0=3.7(3), K’’0=0.12(6).

AB - K-Ca double carbonates recently identified in inclusions in diamonds, as well as associated alkali-carbonate melts can play an important role in the deep carbon cycle. We studied pressure-induced changes in the crystal structure of high-pressure α-K2Ca3(CO3)4 phase up to 20 GPa using synchrotron single-crystal x-ray diffraction in diamond anvil cell. At ~ 7 GPa at room temperature the orthorhombic P212121 phase of α-K2Ca3(CO3)4 undergoes displacive phase transition into monoclinic P1121 phase. Despite the phase transition, PV-curve does not demonstrate any irregularities so that both phases can be described by the same 4th order Birch-Murnaghan equation of state with V0 = 1072.5(3) Å3, K0 = 51.1(8) GPa, K’0=3.7(3), K’’0=0.12(6).

KW - Compressibility

KW - Diamond anvil cell

KW - High-pressure

KW - K-Ca carbonates

KW - Phase transition

UR - https://www.scopus.com/record/display.uri?eid=2-s2.0-85199978038&origin=inward&txGid=6fa8de4a3c5afef0d235a62c8c3449cd

UR - https://www.mendeley.com/catalogue/3ff0f1d7-18de-3add-9c65-d5c170c9563f/

U2 - 10.1007/s00269-024-01292-7

DO - 10.1007/s00269-024-01292-7

M3 - Article

VL - 51

JO - Physics and Chemistry of Minerals

JF - Physics and Chemistry of Minerals

SN - 0342-1791

IS - 3

M1 - 30

ER -