Formability of metastable tetragonal solid solution in nanocrystalline NiO-ZrO2 powders

• Published in: Materials letters Vol. 44; no. 3-4; pp. 203 - 207
• Main Authors: CHANDRA BOSE, A, RAMAMOORTHY, R, RAMASAMY, S
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier 01.06.2000
• Subjects: Chemistry; Clusters, nanoparticles, and nanocrystalline materials; Colloidal state and disperse state; Condensed matter: structure, mechanical and thermal properties; Cross-disciplinary physics: materials science; rheology; Disperse systems; Exact sciences and technology; General and physical chemistry; General, apparatus, technics of preparation; Materials science; Nanoscale materials and structures: fabrication and characterization; Nanoscale materials: clusters, nanoparticles, nanotubes, and nanocrystals; Physics; Structure of solids and liquids; crystallography; Nickel oxides; Particle size; Powders; Inorganic compounds; Crystal lattices; Lattice distortion; Chemical precipitation; Transition element compounds; Crystallization; Crystal chemistry; Experimental study; Solid solutions; Zirconium oxides; Chemical preparation; Chemical composition; Thermal annealing; Nanocrystal
• ISSN: 0167-577X; 1873-4979
• DOI: 10.1016/S0167-577X(00)00028-8

Nanocrystalline ZrO2 powders doped with 10, 20, and 30 mol% NiO were prepared by chemical precipitation. XRD analysis reveals that the concentration of dopant NiO influences the grain size and the variation in grain size seems to influence the formation of the metastable tetragonal solid solution of NiO-ZrO2. Irrespective of the dopant concentration, the as-prepared powders show only a monoclinic phase even though the average grain size is less than the critical size for the tetragonal phase. This may be due to the dominance of the effect of lattice defects such as lattice strain. 12 refs.