See all entries for this property (20 total)
| Initial crystal system | orthorhombic |
| Final crystal system | tetragonal |
| Initial space group | Unknown |
| Final space group | Unknown |
| Direction | Unknown |
| Phase transition temperature | 162.0 K |
Hysteresis: Unknown
Description: Refer to experimental from J. Lumin. 1994, 60&61, 269−274.
Method: Absorption spectra
Description: Experimental data taken from J. Lumin. 1994, 60&61, 269−274 recorded at 159 K (black line) and 212 K (blue line) and computed spectra for bound and continuum pair states, considering two-particle wave function and effective mass equations for electron and hole (expression 3 with γ = 0.03 eV and μ = 0.16me). Structural phase transition occurs at Tc = 162 K (black dashed line). Refer to Fig. 3 and plots from J. Lumin. 1994, 60&61, 269−274.