High-pressure phase diagrams of Na2CO3 and K2CO3

Pavel N. Gavryushkin, Altyna Bekhtenova, Sergey S. Lobanov, Anton Shatskiy, Anna Yu Likhacheva, Dinara Sagatova, Nursultan Sagatov, Sergey V. Rashchenko, Konstantin D. Litasov, Igor S. Sharygin, Alexander F. Goncharov, Vitali B. Prakapenka, Yuji Higo

Результат исследования: Научные публикации в периодических изданияхстатьярецензирование

4 Цитирования (Scopus)


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.

Язык оригиналаанглийский
Номер статьи599
Номер выпуска10
СостояниеОпубликовано - 1 окт 2019

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