Order-disorder phase transition in NH4AlF4


Yurtseven H., Yanik A.

JOURNAL OF PHASE EQUILIBRIA, cilt.23, sa.6, ss.502-505, 2002 (SCI İndekslerine Giren Dergi) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 23 Konu: 6
  • Basım Tarihi: 2002
  • Doi Numarası: 10.1361/105497102770331190
  • Dergi Adı: JOURNAL OF PHASE EQUILIBRIA
  • Sayfa Sayıları: ss.502-505

Özet

In this study we calculate the specific heat C-VI for NH4AlF4 due to the nearest-neighbor interactions between the NH4+ tetrahedra using an Ising model superimposed on an Einstein and/or Debye model. The specific beat C-VI calculated using a power-law formula is in good agreement with the observed C-P for the NH4AlF4 system. This is an indication that NH4AlF4 undergoes a weak first-order or a nearly second-order phase transition as predicted by our model.