Zirconium Silicate

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Chemical and Physical Properties:

Color (Powder): White

Crystal: Transparent

Crystal Parameters (Tetragonal): a = 6.60Ά, c = 5.88Ά

Density: 4.60 gm/cc

Dielectric Constant: 12.7

Entropy: 20.1 Kg Cal/Mole @ 298.16 K

Hardness (Mohs): 7.5

Melting Point: 1538 oC - 1677 oC (decomposes)

Molecular Weight: 183.1

Reflectance:   Infrared:      60 - 75%

                    Ultraviolet:      80 - 85%

Refractive Index: 2.00

Solubility: Insoluble in: H2O, dilute acids, cold dilute alkali solutions and hot concentrated H2SO4. Soluble in: HF (slightly) and hot concentrated alkali solutions.

Specific Heat: 25.53 Cal/oC/Mole

Thermal Conductivity at 100 oC: a = AXIS 0.0101, c = AXIS 0.0097 (Cal/Sec/cm/cm2/oC)

Thermal Expansion: 4.2 x 10-7 in/in/oF, 7.6 x 10-7 cm/cm/oC