Phase transitions in mixed disordered crystals Rb1−xKxCaF3 (0 < x < 1) investigated by Raman spectroscopy Ph. Daniel, J. Toulouse and M. Rousseau Eur. Phys. J. AP, 5 1 (1999) 33-44 Published online: 15 January 1999 DOI: 10.1051/epjap:1999109