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Titolo:
LOW-TEMPERATURE SPECIFIC-HEATS OF LANTHANUM AND YTTRIUM PHOSPHATE-GLASSES
Autore:
CARINI G; DANGELO G; TRIPODO G; SAUNDERS GA;
Indirizzi:
UNIV MESSINA,DIPARTIMENTO FIS,CONTRADA PAPARDO,SALITA SPERONE 31 I-98166 MESSINA ITALY UNIV BATH,SCH PHYS BATH BA2 7AY AVON ENGLAND
Titolo Testata:
Nuovo cimento della Societa italiana di fisica. D, Condensed matter,atomic, molecular and chemical physics, biophysics
fascicolo: 8, volume: 16, anno: 1994,
pagine: 1277 - 1284
SICI:
0392-6737(1994)16:8<1277:LSOLAY>2.0.ZU;2-1
Fonte:
ISI
Lingua:
ENG
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
15
Recensione:
Indirizzi per estratti:
Citazione:
G. Carini et al., "LOW-TEMPERATURE SPECIFIC-HEATS OF LANTHANUM AND YTTRIUM PHOSPHATE-GLASSES", Nuovo cimento della Societa italiana di fisica. D, Condensed matter,atomic, molecular and chemical physics, biophysics, 16(8), 1994, pp. 1277-1284

Abstract

The specific heats of (R(2)O(3))(x)(P2O5)(1-x) glasses containing high concentrations of La3+ and Y3+ ions have been measured between 1.5 Kand 30 K. It is shown that, in addition to the usual Debye contribution, there is an excess specific heat arising from localized vibrational states which has been discussed in terms of two distinct models. Thefirst predicts a maximum in the temperature dependence of the excess specific heat associated with the crossover frequency from phonon to fracton behaviour. The phonon-fracton density of states used to fit theexcess specific heat gives rise to model parameters having the same magnitudes as those found previously for other glasses including samarium phosphates. The second model, formulated on the basis of soft vibrations in glasses, predicts a minimum in the excess specific heat, which is also observed.

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Documento generato il 25/11/20 alle ore 10:19:16