Synthesis of sub-micron spherical monoclinic stabilized Al/zirconia, Al-Ni/zirconia and Al-Ni-Cu/zirconia solid solutions

摘要

A series of monodisperse sub-micron spherical zirconia solid solutions were prepared by hydrolysis of zirconium, aluminum, nickel and copper salts in ethanol. The heat-treatment process of the as-prepared amorphous materials in air atmosphere at 500 degrees C leaded to the production of the zirconia solid solutions in tetragonal phase. Further heating from 800-1400 degrees C resulted in the formation of stabilized monoclinic zirconia solid solutions. X-ray diffraction, Fourier transform infrared spectroscopy and scanning electron microscopy confirmed the formation of pure phase nanocrystalline zirconia solid solutions with spherical shape even at 1000 degrees C. Optical studies of the nanostructured solid solutions showed the decreases in band gaps with increasing the heat-treatment temperature due to grain growth. (C) 2015 Elsevier Ltd and Techna Group S.r.l. All rights reserved.