Zirconium silicate

Zirconium(IV) silicate

Names
Preferred IUPAC name Zirconium(IV) silicate
Systematic IUPAC name Zirconium(4+) silicate
Other names Zircon Zirconium(4+) orthosilicate Zirconium(IV) orthosilicate
Identifiers
CAS Number	10101-52-7 Y
3D model (JSmol)	Interactive image
ChemSpider	55663 N
ECHA InfoCard	100.030.216
EC Number	233-252-7
MeSH	Zircon
PubChem CID	61775
UNII	4SY8H89134 N
InChI InChI=1S/O4Si.Zr/c1-5(2,3)4;/q-4;+4 N Key: GFQYVLUOOAAOGM-UHFFFAOYSA-N N
SMILES [Zr+4].[O-][Si]([O-])([O-])[O-]
Properties
Chemical formula	O4SiZr
Molar mass	183.31 g·mol−1
Appearance	Colourless crystals
Density	4.56 g cm−3
Melting point	2,550 °C (4,620 °F; 2,820 K) (decomposes)
Structure
Crystal structure	tetragonal
Thermochemistry
Specific heat capacity (C)	98.3 J/mol K
Std enthalpy of formation (ΔfHo298)	-2044 kJ/mol
Hazards
Safety data sheet	MSDS
NFPA 704	0 1 1
Flash point	Non-flammable
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
N  (what is YN ?)
Infobox references

Zirconium(4+) orthosilicate

Zirconium silicate, also zirconium orthosilicate, (Zr Si O₄) is a chemical compound, a silicate of zirconium. It occurs in nature as zircon, a silicate mineral. Zirconium silicate is also sometimes known as zircon flour.

Zirconium silicate is usually colorless, but impurities induce various colorations. It is insoluble in water, acids, alkali and aqua regia. Hardness is 7.5 on the Mohs scale.

Zirconium silicate occurs in nature as mineral zircon. Ore is mined from natural deposits and concentrated by various techniques. It is separated from sand by electrostatic and electromagnetic methods.

Also, the compound can be made by fusion of SiO₂ and ZrO₂ in an arc furnace, or by reacting a zirconium salt with sodium silicate in an aqueous solution.

Zirconium silicate is used for manufacturing refractory materials for applications where resistance to corrosion by alkali materials is required. It is also used in production of some ceramics, enamels, and ceramic glazes. In enamels and glazes it serves as an opacifier. It can be also present in some cements. Another use of zirconium silicate is as beads for milling and grinding. Thin films of zirconium silicate and hafnium silicate produced by chemical vapor deposition, most often MOCVD, can be used as a high-k dielectric as a replacement for silicon dioxide in semiconductors.