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Titolo:
SPECIFIC-HEAT AND LOW-ENERGY EXCITATIONS OF SAMARIUM PHOSPHATE-GLASSES
Autore:
CARINI G; DANGELO G; TRIPODO G; SAUNDERS GA;
Indirizzi:
UNIV MESSINA,DIPARTIMENTO FIS,CONTRADA PAPARDO SALITA SPERONE 31 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: 539 - 545
SICI:
0958-6644(1995)71:4<539:SALEOS>2.0.ZU;2-C
Fonte:
ISI
Lingua:
ENG
Soggetto:
TEMPERATURE THERMAL-PROPERTIES; LIGHT-SCATTERING; CONDUCTIVITY; CAPACITY;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
24
Recensione:
Indirizzi per estratti:
Citazione:
G. Carini et al., "SPECIFIC-HEAT AND LOW-ENERGY EXCITATIONS OF SAMARIUM PHOSPHATE-GLASSES", Philosophical magazine. B. Physics of condensed matter. Structural, electronic, optical and magnetic properties, 71(4), 1995, pp. 539-545

Abstract

The specific heats of (Sm2O3)(0.19)(P2O5)(0.81) and (Sm2O3)(0.25)(P2O5)(0.75) glasses have been measured between 1.5 and 30 K using a calorimeter based on the thermal relaxation method. The results show an additional specific heat over that predicted from the Debye theory, whichhas been interpreted in terms of an excess of localized vibrational modes. To provide a basis for preliminary data analysis in terms of localized states, a phonon-fracton density of states has been used. The fit to the excess specific heat gives model parameters having the same magnitudes as those found previously for a wide range of glasses. The cross-over temperature from phonon to fracton behaviour estimated fromthe excess specific heat is similar to that obtained from recent low-frequency Raman scattering measurements.

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Documento generato il 02/12/20 alle ore 18:14:39