Catalogo Articoli (Spogli Riviste)

OPAC HELP

Titolo:
VIBRATIONAL PROPERTIES OF RARE-EARTH PHOSPHATE-GLASSES
Autore:
LIPINSKAKALITA KE; FONTANA A; LEONARDI A; CARINI G; DANGELO G; TRIPODO G; SAUNDERS GA;
Indirizzi:
UNIV TRENT,DIPARTIMENTO FIS I-38010 TRENT ITALY UNIV MESSINA,DIPARTIMENTO FIS I-98010 SANT AGATA ITALY UNIV BATH,SCH PHYS BATH BA2 7AY AVON ENGLAND
Titolo Testata:
Philosophical magazine. B. Physics of condensed matter. Structural, electronic, optical and magnetic properties
fascicolo: 4, volume: 71, anno: 1995,
pagine: 571 - 581
SICI:
0958-6644(1995)71:4<571:VPORP>2.0.ZU;2-L
Fonte:
ISI
Lingua:
ENG
Soggetto:
STRUCTURAL RELAXATION; AMORPHOUS MATERIALS; LIGHT-SCATTERING; RAMAN; DYNAMICS; DENSITY; STATES;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
14
Recensione:
Indirizzi per estratti:
Citazione:
K.E. Lipinskakalita et al., "VIBRATIONAL PROPERTIES OF RARE-EARTH PHOSPHATE-GLASSES", Philosophical magazine. B. Physics of condensed matter. Structural, electronic, optical and magnetic properties, 71(4), 1995, pp. 571-581

Abstract

The Raman spectra of metaphosphate glasses, which contain very high concentrations of either Eu3+ Or Gd3+ ions, have been measured over a wide range of temperatures (10-300 K). The high-frequency part of the spectrum (above 200 cm(-1)) is similar to that found for other phosphate glasses, indicating that these glasses share the common structural feature of a skeleton built up from (PO4)(2-) tetrahedral units. The low-frequency region is determined by two spectral contributions which are characteristic of the disordered topology of vitreous materials: the tight-scattering excess and the 'boson peak'. The former contribution, clearly observed for frequencies below 10 cm(-1), becomes larger with increasing temperature, while the latter does not change appreciably as the temperature is increased to room temperature. Interpretation of the light scattering excess and the boson peak in terms of the predictions of the soft potential model can account for their frequency and temperature dependences.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 02/12/20 alle ore 16:17:38