GOLD
|
PROPERTY |
@ 300K |
UNITS |
REFERENCES |
|
Density |
19.3 |
G/cm3 |
Au1 Au2 Au3 |
|
Specific Heat |
0.03088 |
Cal/g-K |
Au4 Au5 Au6 |
|
Thermal Conductivity |
0.753 |
Cal/cm-s-K |
Au7 Au8 Au9 |
|
Thermal Exp Coef |
14.2x10-6 |
1/K |
Au10 Au11 Au12 |
|
Melting Point |
1337.58 |
K |
Au13 |
|
Resistivity 1 |
2.249x10-6 |
Ohm-cm |
Au14 Au15 Au16 |
|
TCR (218K to 398K) |
3670 |
Ppm/K |
Au14 Au15 Au16 |
|
Young’s Modulus |
1.12x107 |
psi |
Au17 Au18 Au19 |
|
Poisson’s Ratio |
0.425 |
----- |
Au17 Au18 Au20 |
|
Yield Strength |
250 |
psi |
Au21 Au24 Au27 |
|
Ult Tensile strength |
17,000 |
psi |
Au21 Au22 Au23 |
|
Elongation at Break |
50 |
% |
Au21 Au22 Au23 |
|
Hardness |
18.5 |
Brinell |
Au23 Au25 Au26 |
1: The resistivity of sputtered gold films onto bismuth oxide shows resistivities in the range of 7 to 16 micro ohm-cm. Resistivity is dependent on thickness and substrate temperature. Annealed films with thickness > 200 angstroms deposited on substrates held at –183C provides resistivities nearest the bulk values.
Mechanical properties listed are for fully annealed, bulk material. 60% cold work producing 0.05 inch dia wire will increase strength to 30,000 psi and decrease elongation to 4%. [Au30] polycrystalline films demonstrate strengths on the order of 70,000 psi with 2 to 3% elongation. [Au29] Heating cold worked material above 150C causes recovery and recrystalization erasing the effects of cold work.
The mechanical properties for very thin wires differ considerably from the values listed above. Recent work indicates room temperature properties for 0.001 inch(25 micron) wire are: yield strength = 25,000 psi; tensile strength = 30,000 psi; elongation = 4%. [Au30]