... @ 41°CSpecific heat1562J/(kg·K)Thermal conductivity37·10-6/°C @ 0°C---100°CHardness (Mohs)102-113 (Indenter load: 600g)Young ... C12=45.6; C44=63.2GPaDielectric constants9.0@25°C, f=100...109HzWater-solubility0.27g/100g @ 18°CMaterial typeSingle crystal, ... structureCubic, NaCl type structure, a0=4.026ÅCleavage plane(100)Size145mm, 200mmApplicationX-ray monochromator plates; Optical material for VUV ...