Abstract
LiK1-xRbxSO4 (x0.50) mixed crystals have been investigated by neutron powder thermodiffractometry. The temperature evolutions of the lattice parameters of the crystals x = 0.10, 0.20 and 0.50 are presented for the first time, in the temperature range 320 to 800 K. The main effects produced by the random substitution of the rubidium ions in the potassium sites are the variations of the critical temperatures and the smearing of the first order transitions presented by these compounds. A qualitative model based upon lattice parameter and steric repulsion changes is proposed to explain our results. The temperature variations of the c/a ratio show characteristic behaviours for each phase, being almost independent of the particular rubidium concentration.
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