Journal of the Mineralogical Society of Korea (한국광물학회지)

The Mineralogical Society of Korea (한국광물학회)
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High Pressure X-ray Diffraction Study of LiFePO4/C-olivine-like Phase

LiFePO4/C-유사 감람석 결정구조에 대한 고압 X-선회절연구

  • Hwang, Gil-Chan (Department of Earth and Environment Sciences and Research Institute of Natural Sciences, Gyeongsang National University) ;
  • Kim, Young-Ho (Department of Earth and Environment Sciences and Research Institute of Natural Sciences, Gyeongsang National University)
  • 황길찬 (경상대학교 지구환경과학과 및 기초과학연구소) ;
  • 김영호 (경상대학교 지구환경과학과 및 기초과학연구소)
  • Received : 2013.01.22
  • Accepted : 2013.03.22
  • Published : 2013.03.31
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Abstract

Synthetic carbon-coated olivine-like structured lithium iron phosphate ($Li^+Fe^{2+}(PO_4)^{3-}/C$) powder composites were compressed up to 35.0 GPa in the symmetrical diamond anvil cell at room temperature. Bulk modulus of $LiFePO_4/C$ was determined to be $130.1{\pm}10.3$ GPa. New peak appears at the d-spacing of 3.386 ${\AA}$ above 18 GPa, and another new one at 2.854 ${\AA}$ around 35 GPa. The crystallographic symmetry of the sample (i.e. orthorhombic) is apparently retained up to 35 GPa as no clear evidence for the phase transition into spinel structure has been observed. The pressure-induced volume change in the M1 site ($Li^+O_6$) is more significant than those in M2($Fe^{2+}O_6$) and $PO_4$ tetrahedral sites.

유사 올리빈 구조를 가지는 탄소코팅 합성 $Li^+Fe^{2+}(PO_4)^{3-}$ 분말시료에 대한 상온-고압실험을 대칭 다이아몬드 앤빌기기를 이용하여 35.0 GPa까지 시행하였다. $LiFePO_4$의 압축 데이터를 이용하여 계산된 체적탄성률은 $130.1{\pm}10.3$ GPa이다. 18 GPa 이상의 압력에서 d = 3.386 ${\AA}$ 위치에 새로운 피크가 관찰되고 35 GPa에서는 d = 2.854 ${\AA}$에 또 다른 피크가 관찰되고 있으나 주 결정구조는 사방정계인 것으로 판단된다. 압력에 대한 단위 포 부피의 압축은 M1($Li^+O_6$)의 수축이 두드러지고 M2($Fe^{2+}O_6$)와 사면체($PO_4$)의 수축은 상대적으로 작은 것으로 나타났다.

Keywords

References

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