Инд. авторы:	Gavryushkin P.N., Bekhtenova A., Lobanov S.S., Shatskiy A., Likhacheva A.Y., Sagatova D., Sagatov N., Rashchenko S.V., Litasov K.D., Sharygin I.S., Goncharov A.F., Prakapenka V.B., Higo Y.
Заглавие:	High-pressure phase diagrams of Na2CO3 and K2CO3
Библ. ссылка:	Gavryushkin P.N., Bekhtenova A., Lobanov S.S., Shatskiy A., Likhacheva A.Y., Sagatova D., Sagatov N., Rashchenko S.V., Litasov K.D., Sharygin I.S., Goncharov A.F., Prakapenka V.B., Higo Y. High-pressure phase diagrams of Na2CO3 and K2CO3 // Minerals. - 2019. - Т.9. - № 10. - Ст.599.
Внешние системы:	DOI: 10.3390/min9100599; SCOPUS: 2-s2.0-85073522725; WoS: 000498225200032;
Реферат:	eng: The phase diagrams of Na2CO3 and K2CO3 have been determined with multianvil (MA) and diamond anvil cell (DAC) techniques. In MA experiments with heating, gamma-Na2CO3 is stable up to 12 GPa and above this pressure transforms to P6(3)/mcm-phase. At 26 GPa, Na2CO3-P6(3)/mcm transforms to the new phase with a diffraction pattern similar to that of the theoretically predicted Na2CO3-P21/m. On cold compression in DAC experiments, gamma-Na2CO3 is stable up to the maximum pressure reached of 25 GPa. K2CO3 shows a more complex sequence of phase transitions. Unlike gamma-Na2CO3, gamma-K2CO3 has a narrow stability field. At 3 GPa, K2CO3 presents in the form of the new phase, called K2CO3-III, which transforms into another new phase, K2CO3-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 K2CO3-IV has similarities with that of the theoretically predicted K2CO3-P2(1)/m and most of the diffraction peaks can be indexed with this structure. Water has a dramatic effect on the phase transitions of K2CO3. Reconstruction of the diffraction pattern of gamma-K2CO3 is observed at pressures of 0.5-3.1 GPa if the DAC is loaded on the air.
Ключевые слова:	TRANSITIONS; FUSION CURVE; SODIUM-CARBONATE; SYSTEM NA2CO3-CACO3; OLDOINYO-LENGAI; CRYSTAL-STRUCTURE; 6 GPA; TOTAL-ENERGY CALCULATIONS; COMPRESSIBILITY; indexing; global carbon cycle; resistive heating; laser heating; multi anvil apparatus; diamond anvil cell; carbonate; density functional theory; NYEREREITE;
Издано:	2019
Физ. характеристика:	599