Home
Compare Metals


Hafnium Iridium Comparison


Iridium Hafnium comparison


Periodic Table

Symbol
Hf   
Ir   

Group Number
4   
14
9   
9

Period Number
6   
6   

Block
d block   
d block   

Element Family
Transition Metal   
Transition Metal   

CAS Number
7440586   
30
7439885   
99+

Space Group Name
P63/mmc   
Fm_ 3m   

Space Group Number
194.00   
5
225.00   
2

Facts

Interesting Facts
  • Hafnium metal is highly reactive, hence not found free in nature.
  • Hafnium metal as predicated after Mendeleev finished his periodic table.
  
  • Iridium element occurs as natural alloys of Platinum and Osmium.
  • Iridium element is known as the most corrosion resistance metal .
  

Sources
By-product Zirconium Refining   
Found in Minerals, Mining, Ores of Minerals   

History
  
  

Who Discovered
Dirk Coster and George de Hevesy   
Smithson Tennant   

Discovery
In 1922   
In 1803   

Abundance
  
  

Abundance In Universe
7 * 10-8 %   
25
2 * 10-7 %   
22

Abundance In Sun
~0.0000001 %   
26
~0.0000002 %   
25

Abundance In Meteorites
0.00 %   
37
0.00 %   
29

Abundance In Earth's Crust
0.00 %   
31
0.00 %   
99+

Abundance In Oceans
0.00 %   
27
Not Available   

Uses

Uses & Benefits
  • It has an ability to absorb neutrons and hence it is used to make control rods in nuclear submarines. And this metal is also used in Plasma welding torches.
  • It alloys with iron, titanium and niobium are very useful.
  
  • Iridium has an anti corrosion properties and it is used in special alloy with Osmium metal and that alloy is used in pen tips and compass bearings.
  

Industrial Uses
Ammunition Industry   
Automobile Industry, Electrical Industry, Electronic Industry   

Medical Uses
NA   
NA   

Other Uses
Alloys, In Nuclear Reactors, Nuclear Research, Research Purposes   
Alloys   

Biological Properties
  
  

Toxicity
Toxic   
Toxic   

Present in Human Body
No   
Yes   

Physical Properties

Melting Point
2,150.00 °C   
10
2,410.00 °C   
7

Boiling Point
5,400.00 °C   
5
4,527.00 °C   
10

Appearance
  
  

Physical State
Solid   
Solid   

Color
Gray   
Silvery White   

Luster
Metallic   
Metallic   

Hardness
  
  

Mohs Hardness
5.50   
7
6.50   
5

Brinell Hardness
1,450.00 MPa   
6
1,670.00 MPa   
5

Vickers Hardness
1,520.00 MPa   
5
1,760.00 MPa   
3

Speed of Sound
3,010.00 m/s   
27
4,825.00 m/s   
13

Optical Properties
  
  

Reflectivity
Not Available   
78.00 %   
6

Allotropes
No   
No   

α Allotropes
Not Available   
Not Available   

β Allotropes
Not Available   
Not Available   

γ Allotropes
Not Available   
Not Available   

Chemical Properties

Chemical Formula
Hf   
Ir   

Isotopes
  
  

Known Isotopes
32   
7
34   
5

Electronegativity
  
  

Pauling Electronegativity
1.30   
32
2.20   
4

Allred Rochow Electronegativity
1.23   
25
1.55   
11

Allen Electronegativity
1.16   
37
1.68   
17

Electropositivity
  
  

Pauling Electropositivity
2.70   
22
1.80   
99+

Ionization Energies
  
  

1st Energy Level
658.50 kJ/mol   
40
880.00 kJ/mol   
9

2nd Energy Level
1,440.00 kJ/mol   
99+
1,600.00 kJ/mol   
35

3rd Energy Level
2,250.00 kJ/mol   
99+
Not Available   

4th Energy Level
3,216.00 kJ/mol   
99+
Not Available   

Electrochemical Equivalent
1.66 g/amp-hr   
99+
1.14 g/amp-hr   
99+

Electron Work Function
3.90 eV   
27
4.55 eV   
13

Other Chemical Properties
Anti Corrosion, Ionization, Radioactive Isotopes, Solubility   
Flammable, Ionization, Radioactive Isotopes, Radioactivity   

Atomic Properties

Atomic Number
72   
99+
77   
39

Electron Configuration
[Xe] 4f14 5d2 6s2   
[Xe] 4f14 5d7 6s2   

Crystal Structure
Hexagonal Close Packed (HCP)   
Face Centered Cubic (FCC)   

Crystal Lattice
BCC-Crystal-Structure-.jpg#100   
FCC-Crystal-Structure-of-Iridium.jpg#100   

Atom
  
  

Number of Protons
72   
99+
74   
99+

Number of Neutrons
106   
29
110   
27

Number of Electrons
72   
99+
74   
99+

Radius of an Atom
  
  

Atomic Radius
159.00 pm   
28
136.00 pm   
99+

Covalent Radius
175.00 pm   
23
141.00 pm   
99+

Van der Waals Radius
200.00 pm   
28
202.00 pm   
27

Atomic Weight
178.49 amu   
39
192.22 amu   
34

Atomic Volume
13.60 cm3/mol   
38
9.53 cm3/mol   
99+

Adjacent Atomic Numbers
  
  

Previous Element
Lutetium
  
Osmium
  

Next Element
Tantalum
  
Platinum
  

Valence Electron Potential
81.00 (-eV)   
16
140.00 (-eV)   
5

Lattice Constant
319.64 pm   
99+
383.90 pm   
26

Lattice Angles
π/2, π/2, 2 π/3   
π/2, π/2, π/2   

Lattice C/A Ratio
1.58   
12
Not Available   

Mechanical Properties

Density
  
  

Density At Room Temperature
13.31 g/cm3   
26
22.56 g/cm3   
10

Density When Liquid (at m.p.)
12.00 g/cm3   
12
19.00 g/cm3   
3

Tensile Strength
445.00 MPa   
8
2,000.00 MPa   
2

Viscosity
Not Available   
Not Available   

Vapor Pressure
  
  

Vapor Pressure at 2000 K
0.00 (Pa)   
24
0.00 (Pa)   
25

Elasticity properties
  
  

Shear Modulus
30.00 GPa   
23
210.00 GPa   
2

Bulk Modulus
110.00 GPa   
15
320.00 GPa   
3

Young's Modulus
78.00 GPa   
25
528.00 GPa   
1

Poisson Ratio
0.37   
7
0.26   
22

Other Mechanical Properties
Ductile, Malleable   
NA   

Magnetic Properties

Magnetic Characteristics
  
  

Specific Gravity
13.31   
18
21.78   
3

Magnetic Ordering
Paramagnetic   
Paramagnetic   

Electrical Properties
  
  

Electrical Property
Conductor   
Conductor   

Resistivity
331.00 nΩ·m   
14
47.10 nΩ·m   
99+

Electrical Conductivity
0.03 106/cm Ω   
39
0.19 106/cm Ω   
10

Electron Affinity
0.00 kJ/mol   
40
151.00 kJ/mol   
4

Thermal Properties

Specific Heat
0.14 J/(kg K)   
37
0.13 J/(kg K)   
39

Molar Heat Capacity
25.73 J/mol·K   
36
25.10 J/mol·K   
99+

Thermal Conductivity
23.00 W/m·K   
99+
147.00 W/m·K   
10

Critical Temperature
Not Available   
Not Available   

Thermal Expansion
5.90 µm/(m·K)   
99+
6.40 µm/(m·K)   
99+

Enthalpy
  
  

Enthalpy of Vaporization
661.10 kJ/mol   
5
799.10 kJ/mol   
1

Enthalpy of Fusion
25.10 kJ/mol   
8
35.23 kJ/mol   
1

Enthalpy of Atomization
703.00 kJ/mol   
5
837.00 kJ/mol   
1

Standard Molar Entropy
43.60 J/mol.K   
34
35.50 J/mol.K   
99+

Summary >>
<< Thermal

Compare Transition Metals

Transition Metals

Transition Metals

» More Transition Metals

Compare Transition Metals

» More Compare Transition Metals