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Tellurium (52Te127.60)
[13494-80-9]

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Elemental Form

Occasionally found native, tellurium is more often found in combination with other metals. It is silvery-white, lustrous, brittle, and crystalline. (Amorphous tellurium is dark gray to brown and has metal characteristics.) As a p-type semiconductor, it shows greater conductivity in certain directions. Tellurium is used to improve the machinability of copper and stainless steel. When combined with lead, tellurium increases resistance to sulfuric acid while improving strength and hardness.
Melting Point449.5°CBoiling Point989.8°C
Density6.24g/cm3Themal Conductivity0.014cal/cm2/cm/s/°C
Specific Heat @ 25°C0.047cal/g°CHeat of Fusion4.27k-cal/g-atom
Heat of Vaporization11.9k-cal/g-atomAtomic Volume20.5W/D
First Ionization Energy208K-cal/g-moleElectronegativity2.1Pauling's
Covalent Radius1.36AngstromsMohs Hardness @ 20°C2.0-2.5
Electrical Resistivity1.6x105µΩ-cmCrystal StructureHexagonal
Modulus of Elasticity6x106psiPoisson Ratio0.33