Nomenclature
CAS number: 1314-23-4
Zirconia; zirconium dioxide; zirconic anhydride.
O
2Zr; mol wt 123.22.
O 25.97%, Zr 74.03%.
ZrO
2.
Description and 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.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.
Therapeutic Category
Dermatologic.