Polarized IR and Raman spectra, temperature dependence of phonons and lattice dynamic calculations for M2′M"Ge2O7 pyrogermanates (M′ = Sr, Ba; M" = Mg, Zn)

被引：18

作者：

Hanuza, J. ^{[1
,2
]}

Maczka, M. ^{[1
]}

Ptak, M. ^{[1
]}

Lorenc, J. ^{[2
]}

Hermanowicz, K. ^{[1
]}

Becker, P. ^{[3
]}

Bohaty, L. ^{[3
]}

Kaminskii, A. A. ^{[4
]}

机构：

[1] Polish Acad Sci, Inst Low Temp & Struct Res, PL-50950 Wroclaw, Poland

[2] Univ Econ, Fac Engn & Econ, Dept Bioorgan Chem, PL-53345 Wroclaw, Poland

[3] Univ Cologne, Inst Crystallog, D-50674 Cologne, Germany

[4] Russian Acad Sci, Inst Crystallog, Moscow 119333, Russia

来源：

JOURNAL OF RAMAN SPECTROSCOPY | 2011年 / 42卷 / 04期

关键词：

pyrogermanates; spontaneous and stimulated Raman spectra; promoting modes of SRS effect; temperature dependence of phonons; INCOMMENSURATE PHASE-TRANSITION; VIBRATIONAL-SPECTRA; CRYSTAL BA2MGGE2O7; CASCADED CHI((3)); MELILITE SERIES; ENERGY-TRANSFER; GERMANATES; LANTHANIDE; BA2ZNGE2O7; SR2MGGE2O7;

D O I：

10.1002/jrs.2755

中图分类号：

O433 [光谱学];

学科分类号：

0703 ; 070302 ;

摘要：

Infrared and Raman spectra of the polycrystalline samples and single crystals of Sr2ZnGe2O7, Ba2ZnGe2O7, Ba2MgGe2O7 and Sr2MgGe2O7 were measured. The temperature dependence of phonons was studied in the range 4-295 K. The discussion of the results is based on the factor group approach for the tetragonal P (4) over bar2(1) m(D-2d(3)) space group with Z = 2. The discussion of the internal vibrations of the Ge2O7 unit and external modes is made on the basis of the literature data and phonon calculations. The results obtained for the spontaneous Raman scattering were used in the discussion of the stimulated Raman spectra of the studied materials. Copyright (C) 2010 John Wiley & Sons, Ltd.

引用

页码：782 / 789

页数：8

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