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Raman Spectra of Nd:La3Ga5SiO14 and Nd:La3Ga5.5Ta0.5O14 Crystals

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【作者】 张娜娜王继扬潘晓茹宋明君Clenilton Costa dos SantosIlde Guedes da Guedesa

【Author】 ZHANG Na-Na;WANG Ji-Yang;PAN Xiao-Ru;SONG Ming-Jun;Clenilton Costa dos Santos;Ilde Guedes da Guedesa;College of Chemistry & Chemical and Environmental Engineering,Weifang University;State Key Laboratory of Crystal Materials,Shandong University;Departamento de Física,CCET,Universidade Federal do Maranh?o;Departamento de Física,Universidade Federal do Ceará,Campus do Pici;

【机构】 College of Chemistry & Chemical and Environmental Engineering,Weifang UniversityState Key Laboratory of Crystal Materials,Shandong UniversityDepartamento de Física,CCET,Universidade Federal do Maranh?oDepartamento de Física,Universidade Federal do Ceará,Campus do Pici

【摘要】 Single crystals of Nd:La3Ga5SiO14(NLGS) and Nd:La3Ga5.5Ta0.5O14(NLGT) were grown by Czochralski method. Both crystals exhibit a langasite structure(space group D23(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.

【基金】 Supported by the Natural Science Foundation of Shandong Province(BS2015CL012,ZR2014JL029);the Higher Education and Technology Development Plan of Shandong Province(J15LA09,J14LA5);Weifang Science and Technology Development Plan(2015GX003)
【所属期刊栏目】 organic and inorganic structural chemistry (2016年11期)
  • 【DOI】10.14102/j.cnki.0254-5861.2011-1200
  • 【分类号】O785;O657.37
  • 【下载频次】9
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