Journal of the Mineralogical Society of Korea (한국광물학회지)

The Mineralogical Society of Korea (한국광물학회)
권호 표지

High Pressure Phase Transition Study of ${\alpha}$-cristobalite $GaPO_4$

${\alpha}$-크리스토발라이트 구조의 $GaPO_4$에 대한 고압 상변이 연구

  • Hwang, Gil-Chan (Department of Earth and Environment Sciences, Gyeongsang National University) ;
  • Kim, Young-Ho (Department of Earth and Environment Sciences, Gyeongsang National University)
  • 황길찬 (경상대학교 지구환경과학과) ;
  • 김영호 (경상대학교 지구환경과학과)
  • Received : 2010.09.14
  • Accepted : 2010.09.28
  • Published : 2010.09.30
Download PDF
⟨ Previous Next ⟩

Abstract

High pressure x-ray diffraction patterns of ${\alpha}$-cristobalite gallium phosphate ($GaPO_4$) were acquired up to 8.9 GPa at room temperature using Mao-Bell type diamond anvil cell with high flux synchrotron radiation. Starting orthorhombic phase (phase-I) shows the splitting of peak which is possibly resulted from the pressure induced orientation disorder of the framework structure of tetrahedra. This is designated as phase-I'. This phase transforms to the orthorhombic high pressure phase-III between 2 and 3 GPa. Present phase transition sequence is not in accord with the recent high pressure X-ray diffraction results performed on the same starting sample (Ming et al., 2007). X-ray pattern of the unloaded sample to ambient pressure shows that the structure retains that of the high pressure phase prior to decompression.

${\alpha}$-크리스토발라이트 구조의 $GaPO_4$에 대한 고압 x-선 회절 실험을 상온에서 8.9 GPa까지 시행하였다. 정방정계에 속하는 출발결정구조는 1 GPa 이하의 압력에서 회절피크가 분리되는 변화를 보이는데, 아마도 망상구조를 이루고 있는 사면체의 방향성이 압력에 의해 흐트러지면서 상-I'로 상변이가 유도된 것 같다. 압력을 증가시키면, 상-I'는 2 GPa와 3 GPa 사이에서 정방정계에 속하는 고압상(상-III)으로 상변이를 하고 있다. 이 결과는 최근 동일한 시료를 이용하여 얻은 고압실험결과(Ming et al., 2007)와 일치하지 않는다. 최고압력에 도달한 다음, 압력을 대기압으로 내리면 상-III이 그대로 유지되는 것으로 나타났다.

Keywords

References

  1. Badro, J., Itie, J.-P., and Polian, A. (1998) On the high-pressure phase transition in $GaPO_4$. Europhysics Letters, B1, 265-269.
  2. Brown, G.C. and Mussett, A.E. (1993) The Inaccessible Earth. Chapman & Hall (2nd ed.), 276p.
  3. Chio, C.H., Sharma, S.K., Ming, L.C., Nakamoto, Y., and Endo, S. (2008) High pressure raman spectroscopic study of low-cristobalite $GaPO_4$, Joint 21st AIRAPT and 45th EHPRG Int. Conf. on High Pressure Science and Technology. J. Phys. Conference Series, 121, 022003. https://doi.org/10.1088/1742-6596/121/2/022003
  4. Downs, R.T. and Palmer, D.C. (1994) The pressure behavior for ${\alpha}$-cristobalite. Am. Mineral., 79, 9-14.
  5. Duan, W., Wentzcovitch, R.M., and Chelikowsky, J. (1999) First-principles search for high-pressure phases of $GaAsO_4$. Phys. Rev. B, 60, 3751-3756. https://doi.org/10.1103/PhysRevB.60.3751
  6. Hammersley, A.P. (2004) FIT2D V12.012 Reference Manual V6.0. ESRF, 320p.
  7. Jayaraman, A., Sharma, S.K., Wang, S.Y., and Cheong, S.W. (1997) Pressure-induced phases in the spin-Peierls compound $CuGeO_3$. Phys. Rev. B, 55, 5694-5699. https://doi.org/10.1103/PhysRevB.55.5694
  8. Jayaraman, J., Shieh, S.R., Sharma, S.K., Ming, L.C., and Wang, S.Y. (2001) Pressure-induced phase transitions in $CuGeO_3$ from Raman spectroscopic studies. J. Raman Spectrosc., 32, 167-175.
  9. Ming, L.C., Shieh, S.R., Jayaraman, A., Sharma, S.K., and Kim, Y.H. (1999) High-pressure phase transformations of $CuGeO_3$. J. Phys. Chem. Solids, 60, 69-81. https://doi.org/10.1016/S0022-3697(98)00244-3
  10. Ming, L.C., Sharma, S.K., Jayaraman, A.J., Kobayashi, Y., Suzuki, E., Endo, S., Prakapenka, V., and Yang, D. (2005) X-ray diffraction and Raman studies of the $CuGeO_3(III)-(IV)$ transformation under high pressures. Spectrochimica Acta Part A, 61, 2418-2422. https://doi.org/10.1016/j.saa.2005.02.024
  11. Ming, L.C., Nakamoto, Y., Endo, S., Chio, C.H., and Sharma, S.K. (2007) Phase transformations of ${\alpha}$-cristobalite $GaPO_4$ at pressure up to 52 GPa. J. Phys. Condens. Matter, 19, 425202. https://doi.org/10.1088/0953-8984/19/42/425202
  12. Murashov, V.V. (1996) Pressure-induced phase transition of quartz-type $GaPO_4$. Phys. Rev. B, 53, 107-110. https://doi.org/10.1103/PhysRevB.53.107
  13. Murashov, V.V., Dubrovinsky, L.S., Tse, J.S., and LePage, Y. (1995) The pressure-induced phase transition of the ${\alpha}$-cirstobalite form of $GaPO_4$. J. Phys. Condens. Matter, 7, 8279-8286. https://doi.org/10.1088/0953-8984/7/43/008
  14. Palmer, D.C. and Finger, L.W. (1994) Pressure-induced phase transtion in cristobalite: An x-ray powder diffraction study to 4.4 GPa. Am. Mineral., 79, 1-8.
  15. Peters, M.J., Grimsditch, M., and Polian, A. (2000) High pressure Raman scattering from $GaPO_4$. S.S. Commun., 114, 335-340. https://doi.org/10.1016/S0038-1098(00)00042-9
  16. Robeson, J.L., Winters, R.R., and Hammack, W.S. (1994) Pressure-induced transformations of the low-cristobalite phase of $GaPO_4$. Phys. Res. Lett., 73, 1644-1647. https://doi.org/10.1103/PhysRevLett.73.1644
  17. Sato-Sorensen, Y. (1983) Phase transitions and equations of state for the sodium halides : NaF, NaCl, NaBr and NaI. J. Geophys. Res., 88, 3543-3548. https://doi.org/10.1029/JB088iB04p03543
  18. Tsuneyuki, S., Matsui, Y., Aoki, H., and Tsukada, M. (1989) New pressure-induced structural transformations in silica obtained by computer simulation. Nature, 339, 209-211. https://doi.org/10.1038/339209a0