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

被引：136

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

来源：

JOURNAL OF APPLIED PHYSICS | 2014年 / 116卷 / 10期

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.

引用

页数：7

共 53 条

[1] RAMAN-SPECTROSCOPY OF (PB(1+X)/2CU(1-X)/2)SR2(Y1-XCAX)CU2O7+DELTA(X=0, 0.35) [J].

ABRASHEV, MV ;

ILIEV, MN ;

BOZUKOV, LN .

PHYSICA C, 1992, 200 (1-2) :189-194

[2] The binary rare earth oxides [J].

Adachi, G ;

Imanaka, N .

CHEMICAL REVIEWS, 1998, 98 (04) :1479-1514

[3] Gold catalysts supported on ceria doped by rare earth metals for water gas shift reaction: Influence of the preparation method [J].

Andreeva, D. ;

Ivanov, I. ;

Ilieva, L. ;

Abrashev, M. V. ;

Zanella, R. ;

Sobczak, J. W. ;

Lisowski, W. ;

Kantcheva, M. ;

Avdeev, G. ;

Petrov, K. .

APPLIED CATALYSIS A-GENERAL, 2009, 357 (02) :159-169

[4]

Azimi G, 2013, NAT MATER, V12, P315, DOI [10.1038/nmat3545, 10.1038/NMAT3545]

[5] Synthesis, structure and magnetic properties of the Lu2O3-CoO mixed system [J].

Ben Farhat, L. ;

Amami, M. ;

Hlil, E. K. ;

Ben Hassen, R. .

MATERIALS CHEMISTRY AND PHYSICS, 2010, 123 (2-3) :737-741

[6] An X-ray diffraction and magnetic susceptibility study of TmxY2-xO3 [J].

Blanusa, J ;

Mitric, M ;

Rodic, D ;

Szytula, A ;

Slaski, M .

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS, 2000, 213 (1-2) :75-81

[7] VIBRATIONAL-SPECTRA OF CRYSTALS WITH THE A-TYPE RARE-EARTH OXIDE STRUCTURE .1. LA2O3 AND ND2O3 [J].

BOLDISH, SI ;

WHITE, WB .

SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY, 1979, 35 (11) :1235-1242

[8] The lattice constants of the C-forming oxides of rare earth metals [J].

Bommer, H .

ZEITSCHRIFT FUR ANORGANISCHE UND ALLGEMEINE CHEMIE, 1939, 241 (2/3) :273-280

[9] Oxidative coupling of methane catalyzed unexpected synergistic effect of the by rare earth oxides oxide mixtures [J].

Dedov, AG ;

Loktev, AS ;

Moiseev, II ;

Aboukais, A ;

Lamonier, JF ;

Filimonov, IN .

APPLIED CATALYSIS A-GENERAL, 2003, 245 (02) :209-220

[10] A Raman spectroscopic study of C-type rare earth sesquioxides [J].

Dilawar, Nita ;

Mehrotra, Shalini ;

Varandani, D. ;

Kumaraswamy, B. V. ;

Haldar, S. K. ;

Bandyopadhyay, A. K. .

MATERIALS CHARACTERIZATION, 2008, 59 (04) :462-467

← 1 2 3 4 5 6 →