中国物理B ›› 2018, Vol. 27 ›› Issue (11): 117801-117801.doi: 10.1088/1674-1056/27/11/117801

• CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES • 上一篇    下一篇

Temperature-dependent Raman spectroscopic study of ferroelastic K2Sr(MoO4)

Ji Zhang(张季), De-Ming Zhang(张德明), Ran-Ran Zhang(张冉冉)   

  1. 1 An Hui Xin Hua University, Hefei 230088, China;
    2 Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, China;
    3 High Magnetic Field Laboratory of the Chinese Academy of Sciences, Hefei 230031, China
  • 收稿日期:2018-07-02 修回日期:2018-08-09 出版日期:2018-11-05 发布日期:2018-11-05
  • 通讯作者: Ji Zhang E-mail:18956063545@189.cn
  • 基金资助:

    Project supported by the Natural Science Foundation of Anhui Province, China (Grant Nos. KJ2018A0588 and KJ2017A625).

Temperature-dependent Raman spectroscopic study of ferroelastic K2Sr(MoO4)

Ji Zhang(张季)1, De-Ming Zhang(张德明)2, Ran-Ran Zhang(张冉冉)3   

  1. 1 An Hui Xin Hua University, Hefei 230088, China;
    2 Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, China;
    3 High Magnetic Field Laboratory of the Chinese Academy of Sciences, Hefei 230031, China
  • Received:2018-07-02 Revised:2018-08-09 Online:2018-11-05 Published:2018-11-05
  • Contact: Ji Zhang E-mail:18956063545@189.cn
  • Supported by:

    Project supported by the Natural Science Foundation of Anhui Province, China (Grant Nos. KJ2018A0588 and KJ2017A625).

摘要:

Raman scattering measurements of K2Sr(MoO4)2 were performed in the temperature range of 25-750℃. The Raman spectrum of the low-temperature phase α-K2Sr(MoO4)2 that was obtained by first-principle calculations indicated that the Raman bands in the wavenumber region of 250-500 cm-1 are related to Mo-O bending vibrations in MoO4 tetrahedra, while the Raman bands in the wavenumber region of 650-950 cm-1 are attributed to stretching vibrations of Mo-O bonds. The temperature-dependent Raman spectra reveal that K2Sr(MoO4)2 exhibits two sets of modifications in the Raman spectra at~150℃ and~475℃, attributed to structural phase transitions. The large change of the Raman spectra in the temperature range of 150℃ to 475℃ suggests structural instability of the medium-temperature phase β-K2Sr(MoO4)2.

关键词: ferroelastics, K2Sr(MoO4)2 crystal, Raman spectroscopy, phase transition

Abstract:

Raman scattering measurements of K2Sr(MoO4)2 were performed in the temperature range of 25-750℃. The Raman spectrum of the low-temperature phase α-K2Sr(MoO4)2 that was obtained by first-principle calculations indicated that the Raman bands in the wavenumber region of 250-500 cm-1 are related to Mo-O bending vibrations in MoO4 tetrahedra, while the Raman bands in the wavenumber region of 650-950 cm-1 are attributed to stretching vibrations of Mo-O bonds. The temperature-dependent Raman spectra reveal that K2Sr(MoO4)2 exhibits two sets of modifications in the Raman spectra at~150℃ and~475℃, attributed to structural phase transitions. The large change of the Raman spectra in the temperature range of 150℃ to 475℃ suggests structural instability of the medium-temperature phase β-K2Sr(MoO4)2.

Key words: ferroelastics, K2Sr(MoO4)2 crystal, Raman spectroscopy, phase transition

中图分类号:  (Infrared and Raman spectra)

  • 78.30.-j
81.70.-q (Methods of materials testing and analysis) 63.70.+h (Statistical mechanics of lattice vibrations and displacive phase transitions)