|High-pressure Raman scattering and x-ray diffraction of phase transitions in MoO3|
|Liu, D; Lei, WW; Hao, J; Liu, DD; Liu, BB; Wang, X; Chen, XH; Cui, QL; Zou, GT; Liu, J; Jiang, S; Liu J(刘景); Jiang S(蒋升)
|发表期刊||JOURNAL OF APPLIED PHYSICS
; Lei, W. W.
; Hao, J.
; Liu, D. D.
; Liu, B. B.
; Wang, X.
; Chen, X. H.
; Cui, Q. L.
; Zou, G. T.] Jilin Univ, Natl Lab Superhard Mat, Changchun 130012, Peoples R China
; [Liu, J.
; Jiang, S.] Chinese Acad Sci, Beijing Synchrotron Radiat Lab, Inst High Energy Phys, Beijing 100039, Peoples R China
|摘要||The high-pressure behavior of molybdenum trioxides (MoO3) has been investigated by angle-dispersive synchrotron x-ray powder diffraction and Raman spectroscopy techniques in a diamond anvil cell up to 43 and 30 GPa, respectively. In the pressure range of up to 43 GPa, structural phase transitions from the orthorhombic alpha-MoO3 phase (Pbnm) to the monoclinic MoO3-II phase (P2(1)/m), and then to the monoclinic MoO3-III phase (P2(1)/c), occurred at pressures of about 12 and 25 GPa at room temperature, respectively. Our observation of the transition from the orthorhombic alpha-MoO3 to the monoclinic MoO3-II phase is in disagreement with earlier studies in which the phase transition could not be obtained when only pressure is applied. The changes in the Mo-O distances and O-Mo-O and Mo-O-Mo angles may explain the changes in Raman spectrum. The pressure dependence of the volume of two monoclinic high-pressure phases is described by a third-order Birch-Murnaghan equation of state, which yields a bulk modulus value of B-0=143.41(3) GPa with B-0(')=12, and B-0=261.9(3) GPa with B-0(')=3.5.|
equations of state
solid-state phase transformations
Liu, D,Lei, WW,Hao, J,et al. High-pressure Raman scattering and x-ray diffraction of phase transitions in MoO3[J]. JOURNAL OF APPLIED PHYSICS,2009,105(2):23513.
Liu, D.,Lei, WW.,Hao, J.,Liu, DD.,Liu, BB.,...&蒋升.(2009).High-pressure Raman scattering and x-ray diffraction of phase transitions in MoO3.JOURNAL OF APPLIED PHYSICS,105(2),23513.
Liu, D,et al."High-pressure Raman scattering and x-ray diffraction of phase transitions in MoO3".JOURNAL OF APPLIED PHYSICS 105.2(2009):23513.