Thermal conductivity of germanium ingots

Ge content ≥ 99.999%, resistivity ≥ 50Ω • cm (20 ± 0.5 ℃). Silver gray metallic luster, cuboid bar shape, hard and brittle,melting point of 937.4 ℃, boiling point of 2800 ℃, density of 5.325g/cm3.Each ingot is about 100 ~ 500mm long, sealed in a polyethylene film bag, then packed in a polystyrene box, packed in an outer wooden box, and the net weight of each box is about 25kg.