CRITICAL-VALUES FOR SPECIFIC-HEAT FROM RAMAN DATA

SHERMAN W., YURTSEVEN H. H.

JOURNAL OF MOLECULAR STRUCTURE, cilt.247, ss.61-71, 1991 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 247
  • Basım Tarihi: 1991
  • Doi Numarası: 10.1016/0022-2860(91)87063-n
  • Dergi Adı: JOURNAL OF MOLECULAR STRUCTURE
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.61-71
  • Orta Doğu Teknik Üniversitesi Adresli: Hayır

Özet

The use of Raman frequency shifts of non-soft modes to provide detailed predictions of the critical behaviour of specific heat up to within a fraction of a degree of a second order (or weakly first order) phase transition is illustrated. As an example, the lambda-transition of ammonium chloride under ambient pressure has been studied, and values of critical exponents of a- almost-equal-to 0.76 and a+ almost-equal-to 0.82 have been derived for C(p) from the Raman data. This approach is believed to be valid for a wide range of systems showing second-order or weakly first-order phase transitions and it is possible to use it for relatively inaccessible samples such as those within high pressure enclosures.