Tungsten has the highest melting point and lowest vapor pressure of all metals, and at the temperatures over 1650°C has the highest tensile strength. It has excellent corrosion resistance and is attacked only slightly by most mineral acids.
Tungsten is the most useful material used in vacuum evaporation technique, due to its special properties and cost factor.
Properties of Tungsten
| Chemical symbol: |
W |
| Atomic Radius: |
2.02Å |
| Atomic Volume, cm3/mol: |
9.53 |
| Covalent Radius: |
1.3Å |
| Crystal Structure: |
Body centered cube |
| Number of Electron (with no charge): |
74 |
| Atomic Number of Protons: |
74 |
| Number of Neutrons (most common/stable nuclide): |
110 |
| Ionic Radius: |
0.62Å |
| Cross Section: |
18.5 barns ± 0.5 |
Tungsten Boat B1:
Thickness of tungsten foil is 0.05 mm (0.002").
The overall length is 32 mm (1¼").
Trough: 12.7 mm (L) x 9.5 mm (W) x 3.2 mm (D) (½" x ⅝" x 1/32")
Tungsten Boat B2:
Thickness of tungsten foil is 0.25 mm (0.010").
The overall length is 101.6 mm x 19.05 mm (4" x ¾").
Trough: 39.37 mm (L) x 2.79 mm Deep, 0.92 ml
Tungsten Boat B3:
Thickness of tungsten foil is 0.25 mm (0.010").
The overall length is 101.6 mm x 19.05 mm (4" x ¾").
Trough: 39.1 mm (L) x 6.35 mm (W) x 3.3 mmm Deep, 0.5 ml
Tungsten Boat B4:
Thickness of tungsten foil is 0.25 mm (0.010").
The overall length is 100.5 mm x 19.05 mm (3½" x ¾").
Trough: 28.19 mm (L) x 15.87 mm (W) x 3.3 mm Deep, 0.99 ml
Tungsten Boat B5:
Thickness of tungsten foil is 0.25 mm (0.010").
The overall length is 101.6 mm x 12.7 mm (4" x ½").
Trough: 9.65 mm Diameter x 3.81 mm Deep, 0.18 ml
Tungsten Boat B6:
Thickness of tungsten foil is 0.25 mm (0.010").
The overall length is 101.6 mm x 39.1 mm (4" x ½")
Trough: 39.1 mm (L) x 12 mm (W) x 3.55 mm Deep, 1.0 ml
Tungsten Boat B7:
Thickness of tungsten foil is 0.25 mm (0.010").
Overall length is 101.6 mm x 25.4 mm x (4" x 1")
Trough: 53.84 mm (L) x 25 mm (W) x2.28 mm Deep, 2.43 ml