Sr3TaGa3Si2O14(STGS)单晶的晶格振动

doi:10.3964/j.issn.1000-0593.2008.03.032

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Abstract Based on the space group theory,the normal vibration modes of Sr₃TaGa₃Si₂O14 (STGS) single crystal were predicted,and the Raman scattering intensities of non-polar and polar modes were calculated. The Raman spectrum of STGS crystal was measured,and lattice vibration modes of STGS crystal were assigned. For symmetry species A₁,six typical Raman-active optical modes have been recorded at 126,245,557,604,896 and 991 cm^-1,respectively. It is easy to assign the mode of 126 cm^-1 as the relative translation between SiO₄,Sr and the TaO₆. The mode 245 cm^-1 corresponds to the twisting vibration of SiO₄ correlating with the Sr—TaO₆—Sr stretching vibration. The mode 557 cm^-1 was assigned as the O—Ta—O stretching vibration,while the mode 604 cm^-1 as the O—Ga—O stretching vibration. The band at 896 cm^-1 in the Raman spectrum was assigned to be the O—Si—O stretching vibration of the two SiO₄ tetrahedra in the primitive cell of STGS single crystal. Meanwhile,the band at 991 cm^-1 in the Raman spectrum was assigned to be the Si—O stretching vibration of the two SiO₄ tetrahedra in the primitive cell of STGS single crystal. The layer structure of STGS crystal was identified by both theory study and Raman spectroscopy experiment results. The small anisotropy and piezoelectric modulus of STGS crystal were ascribed to the weak distortion of decahedral unit.

Key words：STGS single crystal;Structure;Lattice vibration;Raman spectrum

Received: 2007-08-08 Accepted: 2007-11-16

ZTFLH:

O766

Corresponding Authors: LU Gui-wu E-mail: lugw@cup.edu.cn

Cite this article:

YANG Hong,LU Gui-wu,YU Ying-hui, et al. Lattice Vibration of Sr₃TaGa₃Si₂O₁₄ Single Crystal[J]. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2008, 28(03): 564-568.

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https://www.gpxygpfx.com/EN/10.3964/j.issn.1000-0593.2008.03.032 OR https://www.gpxygpfx.com/EN/Y2008/V28/I03/564

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