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1.2 Physical properties of the RNiO3 system Figure 1.6: Phase diagram of rare earth nickelates - Phase diagram for the RNiO3 family compounds showing Insulator-metal-antiferromagnetic phases as a function of the tolerance factor (or ionic radius) and the temperature (92) dependence of the transition temperature from applied pressure, regardless of rare earth ion. He suggested a common structural and electronic parameter to control this evolution. With respect to the phase diagram of nickelates one can derive that a similar relation appears between transition temperature and tilting angle of NiO6 octahedra. This suggests a significant influence of the arrangement of these octahedra. They have also noticed that R-O bond is more compressive than Ni-O bond which influences the tilting angle (82) and therefore its pressure dependence. Before, a decrease of the tilting angle with increasing temperature had been found. Alonso et al. during their investigation of EuNiO3 structure noted that the distortion of SmNiO3 measured by tilting angle is fairly similar (3). They have also compared the tilting angles of nickelates with respect to the rare earth ion and noted a direct correspondence of the angle with the rare earth ion size. Tilting angle was calculated as in (84) as follows - the tilting angle for rhombohedral LaNiO3 √√ φ = arctg[x(O) 12 − - the tilting angle for orthorhombic RNiO3 φ = arctg[z(O2) 48], 3], (1.4) (1.5) 9 √PDF Image | Investigation of metal-insulator transition in magnetron sputtered samarium nickelate thin films
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