Correlations of the thermodynamic quantities with the frequency shifts of a lattice mode close to the I-II transition in NH4Br

YURTSEVEN H. H., ÖZDEMİR M.

RADIATION PHYSICS AND CHEMISTRY, cilt.79, sa.6, ss.692-695, 2010 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 79 Sayı: 6
  • Basım Tarihi: 2010
  • Doi Numarası: 10.1016/j.radphyschem.2010.01.004
  • Dergi Adı: RADIATION PHYSICS AND CHEMISTRY
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.692-695
  • Orta Doğu Teknik Üniversitesi Adresli: Evet

Özet

We correlate here the specific heat C-p with the frequency shifts (1/V) (partial derivative V/partial derivative T) and the thermal expansivity alpha(p) with the (1/v) (partial derivative V/partial derivative P)(T) close to the I-II transition in NH4Br. This correlation is performed for the Raman mode of vs (140 cm(-1)) using the molar volume data for NH4Br. 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 NH4Br. (C) 2010 Elsevier Ltd. All rights reserved.