Synthesis and properties of NdNiO 3 prepared by low-temperature methods
Abstract
NdNiO 3 has been prepared with a rhombohedral perovskite structure by low-temperature methods, and its magnetic and electric properties have been studied between 4 and 300 K. The temperature coefficient of the resistivity changes at 130 K from positive (i.e., metal-like) to negative (i.e., semiconductor-like), with some thermal hysteresis at this "transition." The magnetic susceptibility shows Curie-Weiss behavior, modified by the changing thermal occupation of the Nd 3+ crystal field levels, over the whole temperature range. Differential thermal analysis and thermogravimetric analysis showed oxygen loss beginning at 900°C in an N 2 atmosphere. Subsequent X-ray analysis at room temperature showed the presence of Nd 2NiO 4 and NiO. The electrical resistivity of sintered polycrystalline samples (1.5 × 10 -2 ohm cm at 300 K) is somewhat above the expected minimum metallic conductivity, but the observation of a positive constant term in the susceptibility above 100 K suggests metallic band behavior. The hysteresis near 130 K suggests a structural distortion at low temperatures.
- Publication:
-
Journal of Solid State Chemistry France
- Pub Date:
- August 1989
- DOI:
- 10.1016/0022-4596(89)90008-X
- Bibcode:
- 1989JSSCh..81..208V