Purity wt%

Impurity: wt%

> 99.99

Mg: <.0005 Al: < .0030 Si: 0.0030 Ti: .0010 Cu: < .0030 Fe: < 0.005 Ca: <.0005 Ag: < .0002

Crystal Structure

Hexagonal: a= 3.252Å, c = 5.313Å

Growth Method

Hydrothermal

Hardness

4 moh scale

Density

5.7 g/cm³

Melt Point

1975 ^oC

Specific Heat

0.125 cal/gm

Thermoelectric Constant

1200 mV /^oK @ 300 ^oC

Thermal Conductivity

0.006 cal/cm/ ^oK

Thermal Expansion

2.90 x 10-6/^oK

Transmission Range

0.4 - 0.6 m > 50% at 2 mm

Dislocation Density

<0001> plane <100 / cm²