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Zirconium vs Hafnium

Zirconium
Hafnium
Hafnium vs Zirconium


Periodic Table
Symbol
Zr   
Hf   
Group Number
4   
14
4   
14
Period Number
5   
6   
Block
d block   
d block   
Element Family
Transition Metal   
Transition Metal   
CAS Number
7440677   
23
7440586   
30
Space Group Name
P63/mmc   
P63/mmc   
Space Group Number
194.00   
5
194.00   
5
Facts
Interesting Facts
  • Zirconium metal can resist to weak acids.
  • Zirconium metal reacts with oxygen and nitrogen in the atmosphere.
  
  • Hafnium metal is highly reactive, hence not found free in nature.
  • Hafnium metal as predicated after Mendeleev finished his periodic table.
  
Sources
Found in Minerals, Mining, Ores of Minerals   
By-product Zirconium Refining   
History
  
  
Who Discovered
Martin Heinrich Klaproth   
Dirk Coster and George de Hevesy   
Discovery
In 1789   
In 1922   
Abundance
  
  
Abundance In Universe
5 * 10-6 %   
13
7 * 10-8 %   
25
Abundance In Sun
~0.000004 %   
16
~0.0000001 %   
26
Abundance In Meteorites
0.00 %   
17
0.00 %   
37
Abundance In Earth's Crust
0.01 %   
14
0.00 %   
31
Abundance In Oceans
0.00 %   
23
0.00 %   
27
Abundance In Humans
0.00 %   
15
Not Available   
Uses
Uses & Benefits
  • As this metal does not absorb neutrons; It is used in nuclear power stations.
  • Its oxide is used in ultra strong ceramics. It is also used in manufacturing Crucibles.
  
  • 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.
  
Industrial Uses
Aerospace Industry, Ammunition Industry   
Ammunition Industry   
Medical Uses
NA   
NA   
Other Uses
Alloys, Nuclear Research, Research Purposes   
Alloys, In Nuclear Reactors, Nuclear Research, Research Purposes   
Biological Properties
  
  
Toxicity
NA   
Toxic   
Present in Human Body
Yes   
No   
In Blood
0.01 Blood/mg dm-3   
21
Not Available   
In Bone
0.10 p.p.m.   
23
Not Available   
Physical Properties
Melting Point
1,852.00 °C   
15
2,150.00 °C   
10
Boiling Point
4,377.00 °C   
11
5,400.00 °C   
5
Appearance
  
  
Physical State
Solid   
Solid   
Color
Silvery White   
Gray   
Luster
Lustrous   
Metallic   
Hardness
  
  
Mohs Hardness
5.00   
8
5.50   
7
Brinell Hardness
638.00 MPa   
19
1,450.00 MPa   
6
Vickers Hardness
820.00 MPa   
15
1,520.00 MPa   
5
Speed of Sound
3,800.00 m/s   
20
3,010.00 m/s   
27
Optical Properties
  
  
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
Zr   
Hf   
Isotopes
  
  
Known Isotopes
24   
15
32   
7
Electronegativity
  
  
Pauling Electronegativity
1.33   
30
1.30   
32
Sanderson Electronegativity
0.90   
25
Not Available   
Allred Rochow Electronegativity
1.22   
26
1.23   
25
Allen Electronegativity
1.32   
34
1.16   
37
Electropositivity
  
  
Pauling Electropositivity
2.67   
24
2.70   
22
Ionization Energies
  
  
1st Energy Level
640.10 kJ/mol   
99+
658.50 kJ/mol   
40
2nd Energy Level
1,270.00 kJ/mol   
99+
1,440.00 kJ/mol   
99+
3rd Energy Level
2,218.00 kJ/mol   
99+
2,250.00 kJ/mol   
99+
4th Energy Level
3,313.00 kJ/mol   
99+
3,216.00 kJ/mol   
99+
5th Energy Level
7,752.00 kJ/mol   
10
Not Available   
6th Energy Level
9,500.00 kJ/mol   
15
Not Available   
Electrochemical Equivalent
0.85 g/amp-hr   
99+
1.66 g/amp-hr   
99+
Electron Work Function
4.05 eV   
26
3.90 eV   
27
Other Chemical Properties
Anti Corrosion, Flammable, Ionization, Radioactive Isotopes, Solubility   
Anti Corrosion, Ionization, Radioactive Isotopes, Solubility   
Atomic Properties
Atomic Number
40   
99+
72   
99+
Electron Configuration
[Kr] 4d2 5s2   
[Xe] 4f14 5d2 6s2   
Crystal Structure
Hexagonal Close Packed (HCP)   
Hexagonal Close Packed (HCP)   
Crystal Lattice
HCP-Crystal-Structure-of-Zirconium.jpg#100   
BCC-Crystal-Structure-.jpg#100   
Atom
  
  
Number of Protons
40   
99+
72   
99+
Number of Neutrons
51   
99+
106   
29
Number of Electrons
40   
99+
72   
99+
Radius of an Atom
  
  
Atomic Radius
160.00 pm   
27
159.00 pm   
28
Covalent Radius
175.00 pm   
23
175.00 pm   
23
Van der Waals Radius
200.00 pm   
28
200.00 pm   
28
Atomic Weight
91.22 amu   
99+
178.49 amu   
39
Atomic Volume
14.10 cm3/mol   
36
13.60 cm3/mol   
38
Adjacent Atomic Numbers
  
  
Previous Element
Yttrium
  
Lutetium
  
Next Element
Niobium
  
Tantalum
  
Valence Electron Potential
80.00 (-eV)   
18
81.00 (-eV)   
16
Lattice Constant
323.20 pm   
99+
319.64 pm   
99+
Lattice Angles
π/2, π/2, 2 π/3   
π/2, π/2, 2 π/3   
Lattice C/A Ratio
1.59   
8
1.58   
12
Mechanical Properties
Density
  
  
Density At Room Temperature
6.52 g/cm3   
99+
13.31 g/cm3   
26
Density When Liquid (at m.p.)
5.80 g/cm3   
99+
12.00 g/cm3   
12
Tensile Strength
330.00 MPa   
12
445.00 MPa   
8
Viscosity
Not Available   
Not Available   
Vapor Pressure
  
  
Vapor Pressure at 2000 K
0.00 (Pa)   
21
0.00 (Pa)   
24
Elasticity properties
  
  
Shear Modulus
33.00 GPa   
20
30.00 GPa   
23
Bulk Modulus
91.10 GPa   
17
110.00 GPa   
15
Young's Modulus
88.00 GPa   
22
78.00 GPa   
25
Poisson Ratio
0.34   
10
0.37   
7
Other Mechanical Properties
Ductile, Malleable   
Ductile, Malleable   
Magnetic Properties
Magnetic Characteristics
  
  
Specific Gravity
6.51   
99+
13.31   
18
Magnetic Ordering
Paramagnetic   
Paramagnetic   
Electrical Properties
  
  
Electrical Property
Conductor   
Conductor   
Resistivity
421.00 nΩ·m   
11
331.00 nΩ·m   
14
Electrical Conductivity
0.02 106/cm Ω   
99+
0.03 106/cm Ω   
39
Electron Affinity
41.10 kJ/mol   
27
0.00 kJ/mol   
40
Thermal Properties
Specific Heat
0.27 J/(kg K)   
19
0.14 J/(kg K)   
37
Molar Heat Capacity
25.36 J/mol·K   
99+
25.73 J/mol·K   
36
Thermal Conductivity
22.60 W/m·K   
99+
23.00 W/m·K   
99+
Critical Temperature
Not Available   
Not Available   
Thermal Expansion
5.70 µm/(m·K)   
99+
5.90 µm/(m·K)   
99+
Enthalpy
  
  
Enthalpy of Vaporization
581.60 kJ/mol   
9
661.10 kJ/mol   
5
Enthalpy of Fusion
20.90 kJ/mol   
11
25.10 kJ/mol   
8
Enthalpy of Atomization
598.00 kJ/mol   
10
703.00 kJ/mol   
5
Standard Molar Entropy
39.00 J/mol.K   
39
43.60 J/mol.K   
34
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