A geometrical model for Mixed cyanide crystals

Details A geometrical model for Mixed cyanide crystals A geometrical model for Mixed cyanide crystals

1999-01-04

arxiv.org/abs/cond-mat/9901012v1

J. of Non-Crystalline Solids {235-237} (1998) 570-575

Physics

Condensed Matter

Disordered Systems and Neural Networks

10 pages, latex

Scientific paper

A model of diluted random field sustained by quenched volume deformations is shown to reproduce puzzling physical features found in X(CN)_{x}Y_{1-x} mixed cyanide crystals. X is an alkali metal (K, Na or Rb) and Y is a spherical halogen ion (Br, Cl or I). Critical thresholds x_c at which associated first order ferroelastic transitions disappear are calculated exactly. The diluted random field is shown to compete with compressibility in making the transition first order. Transitions are then found to remain first order down to x_c except in the case of bromine dilution where they become continuous. All the results are in excellent agreement with available experimental data.

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