Hierarchical microstructure in structural phase transitions

Ferroelastic phase transitions: structure and microstructure.

Landau-type theories describe the observed behaviour of phase transitions in ferroelastic and co-elastic minerals and materials with a high degree of accuracy. In this review, the derivation of the Landau potential G=1/2AthetaS [coth(thetaS/T)-coth(thetaS/TC)]Q2 + 1/4BQ4 + ... is derived as a solution of the general phi4 model. The coupling between the order parameter and spontaneous strain of ...

Structural phase transitions

Structural phase transitions can be studied by a variety of techniques; macroscopic fields, X-ray, light and neutron diffraction, and resonance methods. The information which can be obtained by these different techniques about the order parameter and susceptibility at structural phase transitions is described and compared. Landau theory coupled with the 'sot~ mode' concept provides a simple pic...

Distributional Similarity, Phase Transitions and Hierarchical Clustering

We describe a method for automatically clustering words according to their distribution in particular syntactic contexts. Words are represented by the relative frequency distributions of contexts in which they appear, and relative entropy is used to measure the dissimilarity of those distributions. Clusters are represented by "typical" context distributions averaged from the given words accordi...

Structural Phase Transitions in Ag2Se (Naumannite)

Structural phase transitions in multipole traps