New Barium Rare-Earth Nickel Oxides:  Synthesis, Crystal Structure, and Magnetic Order

• Published in: Chemistry of materials Vol. 10; no. 11; pp. 3405 - 3409
• Main Authors: Gutiérrez-Puebla, E, Ruiz-Valero, C, Campá, J. A
• Format: Journal Article
• Language: English
• Published: Washington, DC American Chemical Society 16-11-1998
• Subjects: Condensed matter: electronic structure, electrical, magnetic, and optical properties; Condensed matter: structure, mechanical and thermal properties; Exact sciences and technology; Inorganic compounds; Magnetic properties and materials; Magnetically ordered materials: other intrinsic properties; Physics; Saturation moments and magnetic susceptibilities; Structure of solids and liquids; crystallography; Structure of specific crystalline solids; Antiferromagnetism; Nickel oxides; Inorganic compounds; Rare earths Oxides; Transition element compounds; XRD; Ionic radius; Rare earth compounds; Experimental study; Magnetic susceptibility; Barium oxides; Chemical preparation; Solid state reaction; Property structure relationship; Quaternary compounds; Exchange interactions; Crystal structure
• DOI: 10.1021/cm980126j
• EISSN: 1520-5002
• ISSN: 0897-4756

Crystals of isostructural R8Ba5Ni4O21 (R = Y, Er, Tm, Yb, and Lu) have been obtained. Conditions for synthesis and stability are reported. The crystal structures of these materials have been established by single-crystal X-ray diffraction:  space group I4/m with cell-parameters a =13.713(1) and 13.666(3) Å, c = 5.692(1) and 5.673(2) Å for R = Y and Er, respectively. The compounds contain square NiO5 pyramids, trigonal RO7 prisms capped on one rectangular face, tetragonal bicapped Ba(1)O10 prisms, and irregular Ba(2)O10 polyhedra. A comparison is made between this structure type and those of R2BaNiO5 and R2BaCuO5. Their structure and properties show close relations. The temperature dependence of the magnetic susceptibility from 350 to 1.8 K, measured for R = Y, Yb, and Er, shows the presence of antiferromagnetic ordering for the Yb and Er compounds.