Correlations of the thermodynamic quantities with the frequency shifts of a lattice mode close to the I-II transition in NH sub(4)Br

Correlations of the thermodynamic quantities with the frequency shifts of a lattice mode close to the I-II transition in NH sub(4)Br

We correlate here the specific heat C sub(p) with the frequency shifts (1/V) ( delta V/ delta T) sub(p) and the thermal expansivity alpha sub(p) with the (1/[nu]) ( delta V/ delta P) sub(T) close to the I-II transition in NH sub(4)Br. This correlation is performed for the Raman mode of [nu] sub(s) (...

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Veröffentlicht in:Radiation physics and chemistry (Oxford, England : 1993) England : 1993), 2010-06, Vol.79 (6), p.692-695
Hauptverfasser: Yurtseven, H, Oezdemir, M
Format: Artikel
Sprache:eng
Schlagworte:
Correlation
Expansion
Frequency shift
Lattice vibration
Lattices
Phase transformations
Specific heat
Spectroscopy
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Zusammenfassung:We correlate here the specific heat C sub(p) with the frequency shifts (1/V) ( delta V/ delta T) sub(p) and the thermal expansivity alpha sub(p) with the (1/[nu]) ( delta V/ delta P) sub(T) close to the I-II transition in NH sub(4)Br. This correlation is performed for the Raman mode of [nu] sub(s) (140 cm super(-1)) using the molar volume data for NH sub(4)Br. It is shown here that spectroscopic modifications of the Pippard relations are applied satisfactorily to the I-II phase transition by using a lattice mode of NH sub(4)Br.
ISSN:0969-806X
DOI:10.1016/j.radphyschem.2010.01.004