The Ni(III) perovskites: synthesis under high oxygen pressures and physico-chemical properties

• Published in: Solid state communications Vol. 117; no. 2; pp. 113 - 115
• Main Authors: Kim, S.J, Demazeau, G, Alonso, J.A, Largeteau, A, Martinez-Lope, J.M, Presniakov, I, Choy, J.-H
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01.12.2000
• Subjects: A. Thallium(III) nickel(III) oxide; D. High oxygen pressure; E. Structural distortion in perovskite; 71.35.Cc; D. High oxygen pressure; E. Structural distortion in perovskite; A. Thallium(III) nickel(III) oxide
• ISSN: 0038-1098; 1879-2766
• DOI: 10.1016/S0038-1098(00)00419-1

The synthesis of new perovskite TlNiO 3 and a comparative study with TNiO 3 (T=rare earth or yttrium) have been performed. TlNiO 3 was synthesized under high pressure. The domain of pressure and temperature conditions required for obtaining pure TlNiO 3 is very narrow (8 GPa≤ P, 650≤ T≤700°C). The unit cell volume of TlNiO 3 shows a large deviation from the relationship between effective ionic radii and unit cell volume for TNiO 3 (T=rare earth or yttrium). Temperature dependence of magnetic susceptibility of TlNiO 3 underlines an antiferromagnetic behavior with T N=100 K. The structural and magnetic behavior are attributed to the strong covalency of Tl(III)–O bond.