Orientational glasses. I. A random compressible model for KCN-KBr

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Abstract
The full phase diagram of K(CN)xBr1-x mixtures is obtained using a mean-field treatment of a dilute random anharmonic compressible ferroelastic model. Integration of elastic degrees of freedom leads to a non-linear percolating problem. No random competing interactions are found. In parallel a simple linear hypothesis for an effective density of cyanides is assumed to account for the asymmetric shape of the cyanide versus the spherical bromide shape. Site percolation of cyanides is thus discriminated from the corresponding orientational percolation. Three characteristic values of cyanide concentration x=0.2, 0.5 and 0.6 are obtained. For x<0.6 the ferroelastic transition is lost. In the range 0.

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