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Titolo:
Pressure-induced phase transitions in CuGeO3 from Raman spectroscopic studies
Autore:
Jayaraman, A; Shieh, SR; Sharma, SK; Ming, LC; Wang, SY;
Indirizzi:
Univ Hawaii, Hawaii Inst Geophys & Planetol, Honolulu, HI 96822 USA Univ Hawaii Honolulu HI USA 96822 phys & Planetol, Honolulu, HI 96822 USA Carnegie Inst Washington, Geophys Lab, Washington, DC 20015 USA Carnegie Inst Washington Washington DC USA 20015 Washington, DC 20015 USA
Titolo Testata:
JOURNAL OF RAMAN SPECTROSCOPY
fascicolo: 3, volume: 32, anno: 2001,
pagine: 167 - 175
SICI:
0377-0486(200103)32:3<167:PPTICF>2.0.ZU;2-X
Fonte:
ISI
Lingua:
ENG
Soggetto:
PEIERLS COMPOUND CUGEO3; COPPER(II) SILICATES; CHAIN STRUCTURES; TEMPERATURE; CLINOPYROXENE; CALORIMETRY; GERMANATES; PYROXENE;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
26
Recensione:
Indirizzi per estratti:
Indirizzo: Sharma, SK Univ Hawaii, Hawaii Inst Geophys & Planetol, 2525 Correa Rd,HIG, Honolulu,HI 96822 USA Univ Hawaii 2525 Correa Rd,HIG Honolulu HI USA 96822 96822 USA
Citazione:
A. Jayaraman et al., "Pressure-induced phase transitions in CuGeO3 from Raman spectroscopic studies", J RAMAN SP, 32(3), 2001, pp. 167-175

Abstract

Pressure-induced phase transitions in the normal phase II) and metastably retained phase III of CuGeO3 were investigated up to 30 and 36 GPa, respectively, by Raman spectroscopy, using single-crystal samples in helium and methanol-ethanol mixture (M/E) as pressure medium. Phase I undergoes two pressure-induced phase transitions; the previously reported I-II near 7 GPa andanother near 18 GPa to a phase designated VI. With phase III as the starting material three reversible pressure-induced phase transitions occur: IV, IV ', V at 8, 12.5 and 18 GPa. The above sequence of phase transitions is observed in helium and in MIE. A highly disordered phase occurs only when phase II is pressurized in MIE but not in helium. The Raman data are discussed in terms of plausible structure models for the high-pressure phases of CuGeO3, indicated by the x-ray diffraction data, as well as the high-pressurecrystal chemistry of other divalent metagermanates. The need for further detailed x-ray diffraction studies is stressed, to gain a deeper understanding of the two different pathways that the pressure-induced transitions follow, depending on the nature of the pressure medium. Copyright (C) 2001 JohnWiley & Sons, Ltd.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 26/09/17 alle ore 09:12:20