Citation: ZHANG Na-Na, WANG Ji-Yang, PAN Xiao-Ru, SONG Ming-Jun, Clenilton Costa dos Santos, Ilde Guedes da Guedes. Raman Spectra of Nd: La₃Ga₅SiO₁₄ and Nd: La₃Ga_5.5Ta_0.5O₁₄ Crystals[J]. Chinese Journal of Structural Chemistry, ;2016, 35(11): 1673-1678. doi: 10.14102/j.cnki.0254-5861.2011-1200 shu

Raman Spectra of Nd: La₃Ga₅SiO₁₄ and Nd: La₃Ga_5.5Ta_0.5O₁₄ Crystals

1.
a College of Chemistry & Chemical and Environmental Engineering, Weifang University, Weifang 261061, China;
2.
b State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, China;
3.
c Departamento de Física, CCET, Universidade Federal do Maranhão, 65080-805, São Luís, MA, Brazil;
4.
d Departamento de Física, Universidade Federal do Ceará, Campus do Pici, CP 6030, Fortaleza, CE, 60455-760, Brazil

Received Date: 17 March 2016
Available Online: 13 June 2016
Fund Project: the Higher Education and Technology Development Plan of Shandong Province (J15LA09, J14LA5) (BS2015CL012, ZR2014JL029)

Single crystals of Nd:La₃Ga₅SiO₁₄ (NLGS) and Nd:La₃Ga_5.5Ta_0.5O₁₄ (NLGT) were grown by Czochralski method. Both crystals exhibit a langasite structure (space group D₃² (P321) with Z=1), whose general formula is A₃BC₂D₃O₁₄, where A, B, C and D represent the dodecahedral, octahedral and tetrahedral positions, respectively. The adding of low content of Nd does not change the crystal structure. Although they are isostructural, the distribution of atoms among the symmetric sites is different. While NLGT exhibits a perfect orderly structure, NLGS exhibits an intrinsically disordered structure due to the random distribution of Ga and Si atoms at the C₃(2) symmetry sites. To understand what changes occur in the phonon distribution when Ta replaces Si, we recorded and analyzed room temperature polarized Raman spectra. We observe 8A₁+18E modes for NLGS and 10A₁+13E for NLGT crystals. When Si is substituted by Ta, we observe that the wavenumber of some modes related to vibrations involving Ga and O atoms decreases. This agrees with the fact that the Ga-O bonds are shorter in NLGS than in NLGT.
- Czochralski method,
- langasite structure,
- Raman scattering,
- piezoelectric
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