%0 Journal Article %1 WOS:000393097900005 %A Na-Na, Zhang %A Ji-Yang, Wang %A Xiao-Ru, Pan %A Ming-Jun, Song %A dos Santos, Clenilton Costa %A da Guedes, Ilde Guedes %C FUIJAN INST RES STRUCT MATTER, CHINESE ACAD SCIENCES, FUZHOU, FUJIAN 350002, PEOPLES R CHINA %D 2016 %I CHINESE JOURNAL STRUCTURAL CHEMISTRY %J CHINESE JOURNAL OF STRUCTURAL CHEMISTRY %K Raman langasite method; piezoelectric} scattering; structure; {Czochralski %N 11 %P 1673-1678 %R 10.14102/j.cnki.0254-5861.2011-1200 %T Raman Spectra of Nd:La3Ga5SiO14 and Nd:La3Ga5.5Ta0.5O14 Crystals %V 35 %X 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 D-3(2) (P321) with Z = 1), whose general formula is A(3)BC(2)D(3)O(14), 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 C-3(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 8A(1)+18E modes for NLGS and 10A(1)+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.

@article{WOS:000393097900005, abstract = {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 D-3(2) (P321) with Z = 1), whose general formula is A(3)BC(2)D(3)O(14), 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 C-3(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 8A(1)+18E modes for NLGS and 10A(1)+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.}, added-at = {2022-05-23T20:00:14.000+0200}, address = {FUIJAN INST RES STRUCT MATTER, CHINESE ACAD SCIENCES, FUZHOU, FUJIAN 350002, PEOPLES R CHINA}, author = {Na-Na, Zhang and Ji-Yang, Wang and Xiao-Ru, Pan and Ming-Jun, Song and dos Santos, Clenilton Costa and da Guedes, Ilde Guedes}, biburl = {https://www.bibsonomy.org/bibtex/2b604aaaa1f23dc6e2b38d5610970ecdf/ppgfis_ufc_br}, doi = {10.14102/j.cnki.0254-5861.2011-1200}, interhash = {326721268e10d1e8cf47e94bd08832a1}, intrahash = {b604aaaa1f23dc6e2b38d5610970ecdf}, issn = {0254-5861}, journal = {CHINESE JOURNAL OF STRUCTURAL CHEMISTRY}, keywords = {Raman langasite method; piezoelectric} scattering; structure; {Czochralski}, number = 11, pages = {1673-1678}, publisher = {CHINESE JOURNAL STRUCTURAL CHEMISTRY}, pubstate = {published}, timestamp = {2022-05-23T20:00:14.000+0200}, title = {Raman Spectra of Nd:La3Ga5SiO14 and Nd:La3Ga5.5Ta0.5O14 Crystals}, tppubtype = {article}, volume = 35, year = 2016 }