Raman spectra of R2O3 (R-rare earth) sesquioxides with C-type bixbyite crystal structure: A comparative study

被引:129
|
作者
Abrashev, M. V. [1 ,2 ]
Todorov, N. D. [2 ]
Geshev, J. [1 ]
机构
[1] Univ Fed Rio Grande do Sul, Inst Fis, BR-91501970 Porto Alegre, RS, Brazil
[2] Univ Sofia, Fac Phys, BG-1164 Sofia, Bulgaria
关键词
X-RAY-DIFFRACTION; VIBRATIONAL-SPECTRA; OXIDES; SPECTROSCOPY; YTTRIUM; SC2O3; LU2O3; MICROSTRUCTURE; TRANSITIONS; SCATTERING;
D O I
10.1063/1.4894775
中图分类号
O59 [应用物理学];
学科分类号
摘要
Raman spectra of R2O3 (R-Sc, Er, Y, Ho, Gd, Eu, and Sm) powders with C-type bixbyite crystal structure are measured. With the help of these data and ones, previously published for other oxides from the same structural family, general dependencies of the frequencies of the Raman peaks on the cubic crystal unit cell parameter are constructed. Using these dependencies and knowing the symmetry of the peaks for one of the oxides, determined from previous single-crystal measurements, it is possible to find out the symmetry of the peaks from the spectra of all compounds. It was found that the frequency of the six lowest frequency peaks scales with the square root of the mass of the rare earth showing that mainly R ions take part in these vibrations. These results agree with performed here lattice dynamical calculations. The anomalous softening of the frequency of some peaks in the spectra of Eu2O3 is discussed. (C) 2014 AIP Publishing LLC.
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页数:7
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