Tin, Sn

Tin is a chemical element with the symbol Sn (Latin: stannum) and atomic number 50. This silvery, malleable poor metal that is not easily oxidized in air and resists corrosion, is found in many alloys and is used to coat other metals to prevent corrosion. Tin is obtained chiefly from the mineral cassiterite, where it occurs as an oxide. It can be alloyed with copper to make bronze. Pewter alloys contain from 85% up to 99% tin.

Tin is a malleable, ductile, highly crystalline, silvery-white metal; when a bar of tin is bent, a strange crackling sound known as the tin cry can be heard due to the breaking of the crystals. This metal resists corrosion from distilled, sea and soft tap water, but can be attacked by strong acids, alkalis, and by acid salts. Tin acts as a catalyst when oxygen is in solution and helps accelerate chemical attack. Tin forms the dioxide SnO2 when it is heated in the presence of air. SnO2, in turn, is feebly acidic and forms stannate (SnO32) salts with basic oxides. Tin can be highly polished and is used as a protective coat for other metals in order to prevent corrosion or other chemical action. This metal combines directly with chlorine and oxygen and displaces hydrogen from dilute acids. Tin is malleable at ordinary temperatures but is brittle when it is cooled.

Technical Data
Symbol Sn Density (20°C)/gcm-3 a5.769
Atomic number 50 Density (20°C)/gcm-3 ß7.265
No. of naturally occurring isotopes 10 Melting point /°C 232
Atomic weight 118.69(+/-3) Boiling point /°C 2623
Electronic configuration [Kr]4d'° ΔHfus/kJmol-1 7.07
rIV (covalent)/pm 140.5 ΔHvap/kJmol-1 296
rIV (ionic, 6-coordinate)/pm 69 ΔHf(monoatomic gas)/kJmol-1 300.7
rIV (ionic, 6-coordinate)/pm 118 Ionization energy/kJmol-1 I 708.4
Electronegativity χ 1.8 Ionization energy/kJmol-1 II 1411.4
Electrical resistivity (20°C)/μohm cm ßllx 10-6 Ionization energy/kJmol-1 III 2942.2
Band gap Eg/kJ mol-1 α7.7, ß0 Ionization energy/kJmol-1 IV 3929.3
Evaporation Techniques
Temperature (oC) @Vap. Pressure Techniques Remarks
10-8 Torr 10-6 Torr 10-4 Torr Electron Beam Crucible Coil Boat
682 807 997 Excellent Al2O3 Tungsten Molybdenum Wets Molybdenum; use Ta liner in EB guns

Evaporation Materials
T7-5001-M pellets 6mm diameter x 3mm long
T7-5002-M pellets 6mm diameter x 6mm long
T7-5003-M pieces 3mm
T7-5017-M pellets 2mm diameter x 2mm long

The foils are available in either rectangular or circular shape. Please enter width and length or diameter of the required foil.

Foil
T7-3003-F 0.004" (0.1mm)
T7-3007-F 0.008" (0.2mm)
Powder
T7-10001-P -200 mesh
T7-10002-P -325 mesh
Rods
T7-2000-R 0.125" (3.175mm)
T7-2001-R 0.250" (6.35mm)
T7-2002-R 0.500" (12.7mm)
T7-2003-R 0.625" (15.88mm)
T7-2004-R 0.750" (19.05mm)
T7-2005-R 1" (25.4mm)
Sheet
T7-4001-S 0.015" (0.38mm)
T7-4002-S 0.020" (0.5mm)
T7-4003-S 0.030" (0.76mm)
T7-4004-S 0.040" (1mm)
T7-4006-S 0.060" (1.5mm)
T7-4008-S 0.125" (3.175mm)
T7-4009-S 0.250" (6.35mm)
T7-4010-S 0.375" (9.525mm)
T7-4011-S 0.500" (12.7mm)
T7-4012-S 0.750" (19.05mm)
T7-4013-S 1" (25.4mm)
Wire
T7-1000-W 0.005" (0.127mm)
T7-1003-W 0.008" (0.203mm)
T7-1007-W 0.020" (0.5mm)
T7-1009-W 0.040" (1.0mm)
T7-1011-W 0.060" (1.5mm)
T7-1014-W 0.080" (2.0mm)