Analysis of the Raman frequencies close to the lambda-phase transition in NH4Cl

Yurtseven H., Tuzer T. U.

JOURNAL OF MOLECULAR STRUCTURE, cilt.834, ss.426-429, 2007 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 834
  • Basım Tarihi: 2007
  • Doi Numarası: 10.1016/j.molstruc.2006.10.062
  • Dergi Adı: JOURNAL OF MOLECULAR STRUCTURE
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.426-429
  • Orta Doğu Teknik Üniversitesi Adresli: Evet

Özet

This study gives our analysis of the Raman frequencies for the lattice modes of v(5)TO(174 cm(-1)), v(5)TO(144 cm(-1)) and v(7)TA(93 cm(-1)), and an internal mode of v(2)(1708 cm(-1)) as functions of temperature in NH4Cl close to its lambda-phase transition (T-lambda = 241.2 K, P = 0). This analysis is performed using a power-law formula with the critical exponent beta for the order parameter according to the soft mode-hard mode coupling model.