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

Observation on meta-stability of thulium nitrate crystal by using electric measurements

“…1, the values of s 0 ðTÞ in cooling and heating cycles of run (1) show appreciable temperature variation of s 0 ðTÞ with thermal hysteresis in the region between 283.15 and 203.15 K. The temperature variation of s 0 ðTÞ as found in the following runs (2) and (3) was attributed to an existence of meta-stable phase in the crystal. In the subsequent measuring runs (4) and (5), the behaviors of s 0 ðTÞ were unable to be observed in the temperature range, and corresponded to the disappearance of meta-stable phase.…”

“…4 at several temperatures in cooling (1) and (5). Larger semicircles are observed in the diagrams at all temperatures in the measuring cycles, and smaller circle at 273.15 and 233.15 K in cooling (1).…”

“…The relaxation processes are related to the characteristic structure of the rare-earth nitrate [5,19].…”

“…The rare-earth nitrate crystals R(NO 3 ) 3 6H 2 O where R is rare-earth element, are triclinic symmetry with the space group P % 1; and the crystal symmetry independent of temperature above 193 K [5]. We have measured successively the electric properties between 203.15 K and room temperature in rare-earth nitrate crystals, and found meta-stable phenomena having non-ergodic nonlinear property [6].…”

Electrical properties of lead nitrate single crystals

“…Many of the meta-stabilities were seen in competition between different coexisting phases near the first-order phase transition point or in slow structural relaxation processes. Rare earth nitrate crystals R(NO 3 ) 3 6H 2 O (R = rare earth element) are of triclinic symmetry with the space group P 1 , and the crystal symmetry is independent of temperature above 193 K [8]. Kawashima et al [9] measured the electrical properties of rare earth nitrate crystals between 203.15 K and room temperature.…”