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Titolo:
Single-crystal IR spectroscopic investigation on fresnoite, Sr-fresnoite and Ge-fresnoite
Autore:
Mayerhofer, TG; Dunken, HH;
Indirizzi:
Univ Jena, Inst Phys Chem, D-07743 Jena, Germany Univ Jena Jena Germany D-07743 na, Inst Phys Chem, D-07743 Jena, Germany
Titolo Testata:
VIBRATIONAL SPECTROSCOPY
fascicolo: 2, volume: 25, anno: 2001,
pagine: 185 - 195
SICI:
0924-2031(20010504)25:2<185:SISIOF>2.0.ZU;2-X
Fonte:
ISI
Lingua:
ENG
Keywords:
single crystal; IR-reflectance-spectroscopy; dielectric tensor; fresnoite; Sr-fresnoite; Ge-fresnoite;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
13
Recensione:
Indirizzi per estratti:
Indirizzo: Mayerhofer, TG Univ Jena, Inst Phys Chem, Lessingstr 10, D-07743 Jena, Germany Univ Jena Lessingstr 10 Jena Germany D-07743 Jena, Germany
Citazione:
T.G. Mayerhofer e H.H. Dunken, "Single-crystal IR spectroscopic investigation on fresnoite, Sr-fresnoite and Ge-fresnoite", VIB SPECTR, 25(2), 2001, pp. 185-195

Abstract

Single crystals of fresnoite (Ba2TiSi2O8), the structural analogue Sr-fresnoite (Sr2TiSi2O8) and the structurally similar Ge-fresnoite (Ba2TiGe2O8) were investigated by FTIR-reflectance- (IRR-) and Raman-spectroscopy. The IRR-spectra were subjected to a complete dispersion analysis in order to evaluate the <(<epsilon>)over cap>-tensor in the range of 100-2000 cm(-1). The results were checked by Raman-spectroscopy, Ba-fresnoite was shown to contain a small amount (about 1-2%) of four co-ordinated Ti, represented by an oscillator at 749 cm(-1). Al-mode at 858 and 871 cm(-1) are not mixed TO-LO-modes but simply pure TO and LO, respectively. Raman microscopy showed thatthe Sr-fresnoite single crystal contained small amounts of rutil, which could not be detected in the IRR-spectra. Because of the great similarity of the E parallel toc-spectra of Ba-, Sr- and Ge-fresnoite, the Ai-mode representing the oscillation of the short Ti-O-bond of the Ge-fresnoite has been assigned to a vibration at 797 cm(-1) (C) 2001 Elsevier Science B.V. All rights reserved.

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Documento generato il 02/04/20 alle ore 04:44:54