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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 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 |
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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.
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Received: 02 July 2018
Revised: 09 August 2018
Accepted manuscript online:
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PACS:
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78.30.-j
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(Infrared and Raman spectra)
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81.70.-q
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(Methods of materials testing and analysis)
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63.70.+h
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(Statistical mechanics of lattice vibrations and displacive phase transitions)
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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
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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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