Результаты исследований: Научные публикации в периодических изданиях › статья › Рецензирование
High-pressure phase diagrams of Na2CO3 and K2CO3. / Gavryushkin, Pavel N.; Bekhtenova, Altyna; Lobanov, Sergey S. и др.
в: Minerals, Том 9, № 10, 599, 01.10.2019.Результаты исследований: Научные публикации в периодических изданиях › статья › Рецензирование
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TY - JOUR
T1 - High-pressure phase diagrams of Na2CO3 and K2CO3
AU - Gavryushkin, Pavel N.
AU - Bekhtenova, Altyna
AU - Lobanov, Sergey S.
AU - Shatskiy, Anton
AU - Likhacheva, Anna Yu
AU - Sagatova, Dinara
AU - Sagatov, Nursultan
AU - Rashchenko, Sergey V.
AU - Litasov, Konstantin D.
AU - Sharygin, Igor S.
AU - Goncharov, Alexander F.
AU - Prakapenka, Vitali B.
AU - Higo, Yuji
N1 - Funding Information: Funding: This research was funded by Russian Science Foundation (project No 14-17-00609-P). SSL was supported by Helmholtz Young Investigators Group CLEAR (VH-NG-1325). Publisher Copyright: © 2019 by the authors. Licensee MDPI, Basel, Switzerland.
PY - 2019/10/1
Y1 - 2019/10/1
N2 - The phase diagrams of Na 2 CO 3 and K 2 CO 3 have been determined with multianvil (MA) and diamond anvil cell (DAC) techniques. In MA experiments with heating, γ -Na 2 CO 3 is stable up to 12 GPa and above this pressure transforms to P63 /mcm-phase. At 26 GPa, Na2 CO3 - P63 /mcm transforms to the new phase with a diffraction pattern similar to that of the theoretically predicted Na2 CO3 - P21 /m. On cold compression in DAC experiments, γ -Na2 CO3 is stable up to the maximum pressure reached of 25 GPa. K2 CO3 shows a more complex sequence of phase transitions. Unlike γ Na2 CO3, γ -K2 CO3 has a narrow stability field. At 3 GPa, K2 CO3 presents in the form of the new phase, called K2 CO3 -III, which transforms into another new phase, K2 CO3 -IV, above 9 GPa. In the pressure range of 9–15 GPa, another new phase or the mixture of phases III and IV is observed. The diffraction pattern of K2 CO3 -IV has similarities with that of the theoretically predicted K2 CO3 - P21 /m and most of the diffraction peaks can be indexed with this structure. Water has a dramatic effect on the phase transitions of K2 CO3. Reconstruction of the diffraction pattern of γ -K2 CO3 is observed at pressures of 0.5–3.1 GPa if the DAC is loaded on the air.
AB - The phase diagrams of Na 2 CO 3 and K 2 CO 3 have been determined with multianvil (MA) and diamond anvil cell (DAC) techniques. In MA experiments with heating, γ -Na 2 CO 3 is stable up to 12 GPa and above this pressure transforms to P63 /mcm-phase. At 26 GPa, Na2 CO3 - P63 /mcm transforms to the new phase with a diffraction pattern similar to that of the theoretically predicted Na2 CO3 - P21 /m. On cold compression in DAC experiments, γ -Na2 CO3 is stable up to the maximum pressure reached of 25 GPa. K2 CO3 shows a more complex sequence of phase transitions. Unlike γ Na2 CO3, γ -K2 CO3 has a narrow stability field. At 3 GPa, K2 CO3 presents in the form of the new phase, called K2 CO3 -III, which transforms into another new phase, K2 CO3 -IV, above 9 GPa. In the pressure range of 9–15 GPa, another new phase or the mixture of phases III and IV is observed. The diffraction pattern of K2 CO3 -IV has similarities with that of the theoretically predicted K2 CO3 - P21 /m and most of the diffraction peaks can be indexed with this structure. Water has a dramatic effect on the phase transitions of K2 CO3. Reconstruction of the diffraction pattern of γ -K2 CO3 is observed at pressures of 0.5–3.1 GPa if the DAC is loaded on the air.
KW - Carbonate
KW - Density functional theory
KW - Diamond anvil cell
KW - Global carbon cycle
KW - Indexing
KW - Laser heating
KW - Multi anvil apparatus
KW - Resistive heating
KW - 6 GPA
KW - laser heating
KW - NYEREREITE
KW - COMPRESSIBILITY
KW - TOTAL-ENERGY CALCULATIONS
KW - resistive heating
KW - multi anvil apparatus
KW - global carbon cycle
KW - FUSION CURVE
KW - TRANSITIONS
KW - carbonate
KW - OLDOINYO-LENGAI
KW - indexing
KW - CRYSTAL-STRUCTURE
KW - SYSTEM NA2CO3-CACO3
KW - SODIUM-CARBONATE
KW - density functional theory
KW - diamond anvil cell
UR - http://www.scopus.com/inward/record.url?scp=85073522725&partnerID=8YFLogxK
U2 - 10.3390/min9100599
DO - 10.3390/min9100599
M3 - Article
AN - SCOPUS:85073522725
VL - 9
JO - Minerals
JF - Minerals
SN - 2075-163X
IS - 10
M1 - 599
ER -
ID: 21927983