1981 年 50 巻 6 号 p. 2091-2094
X-ray diffuse scattering due to the orientational disorder of NO3− ions is observed in cubic RbNO3 of the CsCl type (phase III) with photographic and counter methods. The observed diffuse scattering is essentially identical to that observed previously in cubic NH4NO3 by the present authors. The temperature dependence of its intensity suggests that the orientational disorder of NO3− ions does not show an anomaly associated with the dielectric anomaly in the vicinity of the transition to the higher temperature phase II, but shows the pre-transformation effect towards the lower temperature phase IV.
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