Order-disorder phase transition in potassium thiocyanate
1991; American Physical Society; Volume: 44; Issue: 17 Linguagem: Inglês
10.1103/physrevb.44.9159
ISSN1095-3795
AutoresO. Blaschko, W. Schwarz, W. Schranz, A. Fuith,
Tópico(s)Theoretical and Computational Physics
ResumoThe order-disorder phase transition in KSCN near 142 \ifmmode^\circ\else\textdegree\fi{}C, which is connected with the head-tail orientation of the linear SCN molecules, is investigated by diffuse-neutron-scattering techniques. The results show a transition from a long-range-ordered structure to a short-range-ordered state which persists up to temperatures near the melting point. Above ${\mathit{T}}_{\mathit{c}}$ near the (100) superlattice point, a Lorentzian intensity distribution is observed whose temperature dependence shows a mean-field behavior. The short-range-ordered state is described by an ensemble of ordered microdomains.
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