|
IRIDIUM
ROD (Ir)
MATERIAL
OVERVIEW
Characteristics: Silver-white. Low ductility. Does not tarnish in
air. On heating strongly, a slightly volatile oxide is
formed. Insoluble in acid, slowly soluble in aqua
regia and in fused alkalies. Most corrosion-resistant
element, modulus of elasticity is one of the highest.
Highly resistant to chemical attack. Toxicity is
probably low.
GENERAL
PROPERTIES
|
Symbol:
|
Ir
|
|
Atomic
Number:
|
77
|
|
Atomic
Weight:
|
192.22
|
|
Density:
|
22.42 gm/cc
|
|
Melting
Point:
|
2410 oC
|
|
Boiling
Point:
|
4130 oC
|
|
Thermal
Conductivity:
|
1.47 W/cm/oK @ 298.2 oK
|
|
Electrical
Resistivity:
|
5.3 microhm-cm @ 20 oC
|
|
Electronegativity:
|
2.2 Paulings
|
|
Specific
Heat:
|
0.0317 Cal/g/oK @ 25 oC
|
|
Heat
of Vaporization:
|
152 K-cal/gm atom at 4130 oC
|
|
Heat
of Fusion:
|
6.6 Cal/gm mole
|
TYPICAL
ANALYSES
Impurities
in ppm
|
Material
/ Purity:
|
3N5
|
4N
|
|
Pt
|
185
|
-
|
|
B
|
<5
|
-
|
|
Mg
|
<10
|
10
|
|
Ni
|
<5
|
-
|
|
Zn
|
<10
|
-
|
|
Pb
|
10
|
-
|
|
Cr
|
10
|
-
|
|
Mn
|
<10
|
-
|
|
Fe
|
<10
|
20
|
|
Pd
|
<10
|
-
|
|
Co
|
<1
|
-
|
|
Sn
|
<5
|
-
|
|
As
|
<20
|
-
|
|
Sb
|
<10
|
-
|
|
Bi
|
<1
|
-
|
|
Te
|
<20
|
-
|
|
Ag
|
-
|
10
|
|
Ca
|
-
|
10
|
|
Cu
|
-
|
10
|
|
Na
|
-
|
10
|
|
Si
|
-
|
20
|
IRIDIUM
ROD
|
Material
|
Purity
|
|
Iridium
rod .250"
|
3N5,
4N
|
|
 |
