Spectroscopic modifications of Pippard relations: first-order and second-order phase transitions in NH4Cl

Yurtseven H. H., Yanik A.

JOURNAL OF MOLECULAR STRUCTURE, cilt.560, ss.161-167, 2001 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 560
  • Basım Tarihi: 2001
  • Doi Numarası: 10.1016/s0022-2860(00)00753-5
  • Dergi Adı: JOURNAL OF MOLECULAR STRUCTURE
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.161-167
  • Orta Doğu Teknik Üniversitesi Adresli: Hayır

Özet

In this study we introduce the spectroscopic modifications of Pippard relations and apply them to the disorder-induced Raman modes of NH4Cl in the first-order (P = 0) and second-order (2.8 kbar) phase regions in this crystalline system. We obtain Linear variations of the specific heat C-p with out observed frequency shifts [(l/nu)(partial derivative nu/partial derivativeT)(p)] of those Raman modes studied for the first-order and second-order phase transitions in NH4Cl. This will be discussed in detail. (C) 2001 Elsevier Science B.V. All rights reserved.