Landau mean-field model with the cubic term for the alpha-beta transition in quartz

Ates S., Yurtseven H.

BULLETIN OF MATERIALS SCIENCE, cilt.43, sa.1, 2020 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 43 Sayı: 1
  • Basım Tarihi: 2020
  • Doi Numarası: 10.1007/s12034-020-02127-1
  • Dergi Adı: BULLETIN OF MATERIALS SCIENCE
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, Aerospace Database, Chemical Abstracts Core, Communication Abstracts, Compendex, INSPEC, Metadex, Civil Engineering Abstracts
  • Anahtar Kelimeler: Landau model, alpha-beta transition, quartz, INCOMMENSURATE PHASE, TEMPERATURE-DEPENDENCE, MOLECULAR-DYNAMICS, ELASTIC-CONSTANTS, HEAT-CAPACITY, INSTABILITY, FREQUENCY, PHONON, RANGE
  • Orta Doğu Teknik Üniversitesi Adresli: Evet

Özet

Thermodynamic quantities are calculated as a function of temperature by using Landau mean-field model for the alpha-beta transition in quartz. By expanding the Gibbs free energy in terms of the order parameter (Q) with the cubic term (Q(3)), the temperature dependence of the relevant thermodynamic quantities are predicted using the heat capacity (C-P), which is fitted to the experimental data from the literature for the alpha-beta transition in quartz. Our results indicate that the Landau mean-field model is adequate to describe the first-order alpha-beta transition in quartz.