| |
 |
| PHYSICAL
PROPERTIES OF NIOBIUM |
| AtomicNumber |
41 |
| Atomic Weight |
92.91 |
| Atomic Radius |
1.47 |
| Atomic Volume (cc/g-atom) |
10.83 |
| Density (g/cc @20°C) |
8.55 |
| (lbs./in3) |
0.310 |
| Crystal Structure |
Body-centered cubic |
| Lattice constant,
@ 20°C |
3.294 |
| Isotope, natural |
93 |
| Melting point |
4474°F |
| |
2468°C |
| Specific Heat (cal/gm
@ 0°C) |
0.0647 |
| Thermal conductivity
(cal/cmsec/°C @ 0-100°C) |
0.13 |
| Coefficient of linear
expansion per °C |
6.8-7.0 x 10-6 |
| Heat of sublimation
(K cal/g-atom @ 20°C) |
170.9 |
| Heat of combustion
(cal/gm @ 20°C) |
2379 |
| Electrical resistivity
(microhmcm @ 20°C) |
13.2-14.8 |
| Temperature coefficient
of electrical resistivity per °C |
0.00395 |
| Ionization potential,
volts |
6.77 |
| Positive ion emission,
e.v |
5.52 |
| Electron work flinction,
e.v |
4.01 |
| Electrochemical
equivalent, mg/coulomb |
0.1926 |
|
| MECHANICAL
PROPERTIES |
| Tensile
strength, (psi) sheet, annealed Grade I |
30,000 |
| Yield
strength, (psi) 0.2% offset, sheet, annealed |
15,000 |
| Elongation,
%, annealed |
30 |
| Young's
Modulus, (psi) |
15.2 x 106 |
| Hardness,
(500 kg) Brinell, arc cast |
60 to 75 |
| electron
beam cast |
45 to 65 |
Page
34 of 34
INDEX •
CORROSION RESISTANCE
PROPERTIES • FABRICATION
NIOBIUM
PRODUCTS • SPECIFICATIONS
of NIOBIUM
NIOBIUM ELECTRONICS APPLICATIONS
|
|
|
