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

doi:10.1088/1674-1056/27/11/117801

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.

Keywords: ferroelastics K₂Sr(MoO₄)₂ crystal Raman spectroscopy phase transition

Received: 02 July 2018
Revised: 09 August 2018
Accepted manuscript online:

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

Fund:

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

Corresponding Authors: Ji Zhang
E-mail: 18956063545@189.cn

Cite this article:

Ji Zhang(张季), De-Ming Zhang(张德明), Ran-Ran Zhang(张冉冉) Temperature-dependent Raman spectroscopic study of ferroelastic K₂Sr(MoO₄) 2018 Chin. Phys. B 27 117801

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

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