Title: Zirconium Oxide
CAS Registry Number: 1314-23-4
Additional Names: Zirconia; zirconium dioxide; zirconic anhydride
Molecular Formula: O2Zr
Molecular Weight: 123.22
Percent Composition: O 25.97%, Zr 74.03%
Line Formula: ZrO2
Literature References: Occurs in nature as the mineral baddeleyite. Prepn: Clark, Reynolds, Ind. Eng. Chem. 29, 711 (1937); Henderson, Higbie, J. Am. Chem. Soc. 76, 5878 (1954).
Properties: White, heavy, amorphous, odorless, tasteless powder or monoclinic crystals. Also forms tetragonal crystals above ~1100°; cubic above ~1900°. d 5.85. mp 2680°. bp 4300°. Practically insol in water; slightly sol in HCl, HNO3; slowly sol in HF; dissolves on heating with a mixt of 2 parts H2SO4 and 1 part H2O. Fusion with sodium carbonate results in the formation of sodium zirconate which dec hydrolytically with water to form sodium hydroxide and practically insol zirconium hydroxide.
Melting point: mp 2680°
Boiling point: bp 4300°
Density: d 5.85
Use: Instead of lime for the oxyhydrogen light; with earths of the yttrium group in incandescent lighting (Nernst lamps); as pigment, abrasive; manuf enamels, white glass, refractory crucibles, and furnace linings.