Report on Temperature Dependence of Crystal Structure
for Samarium Nitrate Having Metastable Phenomena

Abstract

The crystal structures of samarium nitrate Sm(NO₃)₃6H₂O at temperatures 297, 253 and 193 K± 1 K were investigated by single crystal X ray diffraction technique. The crystal symmetry at the temperatures was triclinic with space group P1. The structures were solved by using Fourier techniques. The full matrix least-squares refinement for the structure at 297 K led to the residual factors R=0.016 and R_w=0.026 for 213 variables and 5078 observed independent reflections. The structures at 253 K and 193 K were solved by using the same methods. The influence of the metastable phenomena on the structures was examined in detail.