PHASES AND PHASE-TRANSITIONS IN THE MIXED MOLECULAR-SYSTEM (NACN)1-X(KCN)X

The phase diagram of (NaCN)1-x(KCN)x was examined by neutron powder diffraction in the temperature range 5K ≦T≦300 K. Several non-cubic low-temperature phases were identified for concentrations x<xc1=0.15 and x≧xc2=0.89. Lattice parameters and ferroelastic deformations were determined from the observed powder patterns. The phase transformations were characterized following the temperature dependence of the appropriate order parameters. © 1990 Springer-Verlag.