Table of Optical Crystal Characteristics 2

Material name	Magnesium Oxide (MgO)	Cesium Iodide (CsI)	Calcite (CaCO₃)	Thallium-Bromide Chloride(KRS-6)	Thallium-Bromide lodide(KRS-5)
Transmission range ()	0.258.5	0.2470.0	0.35.5	0.4134.0	0.540.0
Crystal system	Cubic	Cubic	Trigonal	Cubic	Cubic
Crystal structure	Rock salt	Cesium chioride	Sodium nitrate	Cesium chioride	Cesium chioride
Cleavage plane	100	None	1011	None	None
Color	Colorless	Colorless	Colorless	Colorless	Deep red
Density	3.576(25)	4.526	2.7102(20)	7.192(16)	7.371(16)
Melting point()	2800	621	1339 (under 102.5 atmospheric pressure decomposes at 834.4)	423.5	414.5
Reflection loss (for 2 surfaces)	11.6%(4)	13.6%(10)	10.6%(2)	24.2%(10)	28.4%(10)
Solubility index (number of grams for 100g of water)	Insoluble	0 44.0 60 160.0	8.7 1.0X10^-3 25 1.4X10^-3 75 1.8X10^-3 100 2.1X10^-3	20 0.32	10 0.02 25 0.05
Hardness (Knoop Number)	692.0		99.8	29.9<110> 38.5<100>	33.2<110> 39.8<100>
Thermal conductivity (cal/cm sec)	6X10^-2 (20)	2.7X10^-3 (25)	1.32X10^-2 (Parallel to C axis) 1.11X10^-2 (Vertical to C axis)	1.71X10^-3 (56)	1.3X10^-3 (20)
Specific heat (cal/g)	0.209(0)	0.048(20)	0.203(0)	0.0482(20)
Thermal expansion (/)	13.8X10^-6 (201000)	50X10^-6 (2550)	26.31X10^-6 (Parallel to C axis) 5.44X10^-6 (Vertical to C axis)	50X10^-6 (20100)	58X10^-6 (20100)
MaxX.diameterheight(mm)	50X50	100X100	60X60	80X100	80X100

Material name	Silicon (Si)	Germanium (Ge)	Zinc Selenide (ZnSe)	Zinc Sulfide (ZnS)
Transmission range ()	1.215.0	1.823.0	0.522.0	0.3714.0
Crystal system	Cubic	Cubic	Amorphous	Amorphous
Crystal structure	Diamond	Diamond
Cleavage plane	111	111
Color	Metallic luster	Metallic luster	Light yellow	Colorless
Density	2.329(25)	5.327(25)	5.27	4.09
Melting point()	1420	942	1700	1800
Reflection loss (for 2 surfaces)	46.1%(10)	52.8%(10)
Solubility index (number of grams for 100g of water)	Insoluble	Insoluble
Hardness (Knoop Number)	1150	692	110	160
Thermal conductivity (cal/cm sec)	0.39(40)	0.14(20)	4.3X10^-2 (25)	6.2X10^-3 (27)
Specific heat (cal/g)	0.168(25)	0.074(0100)	0.081
Thermal expansion (/)	4.15X10^-6 (1050)	5.5X10^-6 (0100)	7.57X10^-6 (20170)	6.5X10^-6
Max.diameterXheight(mm)	150X100	150X100	500X25 (500X1000X25)	500X25 (500X1000X25)