Local molecular order in the glassy crystalline phase of cyanoadamantane : diffuse X-ray scattering analysis

Abstract
This Letter presents the results of X-ray scattering experiments performed on cyanoadamantane in its plastic phase (I) and its « glassy crystal » state (Ig) obtained by the quenching of phase (I). The patterns associated with this latter phase are more structured and are characterized by the presence of narrow spots at the X boundary points. An interpretation is proposed in terms of geared antiferroelectric domains. The coherence length is ξ ≃ 20 A