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Titolo:
Ultrasonic frequencies calculated for the q[100] mode in the first-order, tricritical and the second-order phase transitions of NH4Cl
Autore:
Yurtseven, H; Bas, M;
Indirizzi:
Istanbul Tech Univ, Dept Phys, TR-80626 Istanbul, Turkey Istanbul Tech Univ Istanbul Turkey TR-80626 s, TR-80626 Istanbul, Turkey
Titolo Testata:
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
fascicolo: 7, volume: 57, anno: 2001,
pagine: 1347 - 1359
SICI:
1386-1425(200106)57:7<1347:UFCFTQ>2.0.ZU;2-6
Fonte:
ISI
Lingua:
ENG
Soggetto:
AMMONIUM HALIDES; CRYSTALS;
Keywords:
ultrasonic frequencies; phase transitions; NH4Cl;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
11
Recensione:
Indirizzi per estratti:
Indirizzo: Yurtseven, H Istanbul Tech Univ, Dept Phys, TR-80626 Istanbul, Turkey Istanbul Tech Univ Istanbul Turkey TR-80626 stanbul, Turkey
Citazione:
H. Yurtseven e M. Bas, "Ultrasonic frequencies calculated for the q[100] mode in the first-order, tricritical and the second-order phase transitions of NH4Cl", SPECT ACT A, 57(7), 2001, pp. 1347-1359

Abstract

This study correlates the volume changes to the ultrasonic frequencies of the q[100] mode of NH4Cl for the first-order, tricritical and the second-order phase transitions in this crystal. Using these correlations we were able to calculate the ultrasonic frequencies of this mode at the pressures of 0, 0.6 and 1.1 kbar (first-order), 1.6 kbar (tricritical) and 2.15 kbar (second-order) by means of the volume change data from the literature. Our calculated frequencies are in good agreement with the observed data for the phase region below the critical temperature T-C for the first-order, tricritical and the second-order phase transitions in NH4Cl. Above T-C our calculated frequencies do not agree satisfactorily for the q[100] mode and it is incapable of explaining the observed behaviour of NH4Cl. Our method of calculating the ultrasonic frequencies is presented. (C) 2001 Elsevier Science B.V. All rights reserved.

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Documento generato il 11/07/20 alle ore 16:21:45