Volume 31 Issue 2
Apr 2017
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HAN Lin, MA Mai-Ning, XU Zhi-Shuang, ZHOU Xiao-Ya. Structural Properties and Phase Transition of Pyroxene Polymorphs from First-Principles[J]. Chinese Journal of High Pressure Physics, 2017, 31(2): 125-134. doi: 10.11858/gywlxb.2017.02.004
Citation: HAN Lin, MA Mai-Ning, XU Zhi-Shuang, ZHOU Xiao-Ya. Structural Properties and Phase Transition of Pyroxene Polymorphs from First-Principles[J]. Chinese Journal of High Pressure Physics, 2017, 31(2): 125-134. doi: 10.11858/gywlxb.2017.02.004

Structural Properties and Phase Transition of Pyroxene Polymorphs from First-Principles

doi: 10.11858/gywlxb.2017.02.004
  • Received Date: 05 Feb 2016
  • Rev Recd Date: 16 Apr 2016
  • In order to evaluate the structures of magnesium end-member pyroxene polymorphs (MgSiO3) under different pressures, first-principles theoretical calculation on low- and high-pressure phases, with space group Pbca, P21/c, C2/c, P21ca respectively, was conducted under pressures up to 30 GPa.The bulk moduli of polymorphs were obtained from fitting the third-order Birch-Murnaghan equation with calculated pressure-volume data.The C2/c phase had the largest modulus (an increase of 3% compared to Pbca) under zero-temperature and zero-pressure, whereas little difference was observed between moduli of Pbca and P21/c, and the high-pressure phase P21ca showed a smaller value than Pbca.Moreover, the results of axial compression showed that the c-axis was harder to compress than a-axis in C2/c, which was opposite to the previous first-principle results on diopside (MgCaSi2O6).The angels of SiO4 tetrahedral chains in P21/c, C2/c, and P21ca decreased monotonically as a function of pressure while in Pbca, which had two kinds of angles, one showed the same trend as the aforementioned three polymorphs and the other increased monotonically above 7 GPa, implying an unstable structure or the onset of a new phase transition.The static enthalpy differences among the four polymorphs indicated the possible phase transitions of the pyroxene under low-temperature and high-pressure.

     

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