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1. INTRODUCTION Table 1.3: Sintering conditions, delta, TMI, lattice parameters and Ni-O-Ni bond angles for various NdNiO3−δ. As presented in (91). Sintering atmosphere 7 d, in O2 2 d, in air + 5d, in O2 4 d, in air + 3 d, in O2 7 d, in air 7 d, in N2 lattice parameters δ TMI,K a, ̊A b , ̊A 5.431 5.430 5.429 5.428 5.426 c, ̊A 7.556 7.604 7.611 7.620 7.628 Ni-O-Ni bond angles θ, (deg.) 157.82 155.55 155.49 155.37 155.26 φ, (deg.) 159.86 158.47 157.40 156.36 155.51 0.08 0.12 0.15 0.20 0.22 180 190 210 > 300 > 300 5.432 5.392 5.390 5.387 5.383 Figure 1.7: The crystal structure of NdNiO3. - The structure of NdNiO3 with distinguished NiO6 octahedra. The deviation from perovskite structure is small enough to keep octahedral environment of Ni ions, but with Ni-O-Ni bond angles θ and φ different from 180◦ (91) Such possible change in crystal structure had a clear influence on the electronic properties of the compounds. 1.2.2 Electronic structure Conductivity of rare earth nickelates has been for a long time the source of interest due to the ’difficult’ nature of the so-called metal-insulator transition. This, more of a semiconductor rather than insulator to metal, transition was investigated early by plain resistivity measurements. They have shown a drop in resistance of a few orders of magnitude. A sharply decreasing semiconductor-like resistivity at the MIT is inflected to exhibit the metallic-like character. 12PDF Image | Investigation of metal-insulator transition in magnetron sputtered samarium nickelate thin films
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