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Hafnium vs Niobium

Hafnium
Niobium
Niobium vs Hafnium


Periodic Table
Symbol
Hf  
Nb  
Group Number
4  
14
5  
13
Period Number
6  
5  
Block
d block  
d block  
Element Family
Transition Metal  
Transition Metal  
CAS Number
7440586  
30
7440031  
99+
Space Group Name
P63/mmc  
Im_ 3m  
Space Group Number
194.00  
5
229.00  
1
Facts
Interesting Facts
  • Hafnium metal is highly reactive, hence not found free in nature.
  • Hafnium metal as predicated after Mendeleev finished his periodic table.
  
  • Niobium metal was used to get called Columbium in past.
  • Niobium metal found freely in nature (abundance).
  
Sources
By-product Zirconium Refining  
By-product of Tin Extraction, Found in Minerals, Mining, Ores of Minerals  
History
  
  
Who Discovered
Dirk Coster and George de Hevesy  
Charles Hatchett  
Discovery
In 1922  
In 1801  
Abundance
  
  
Abundance In Universe
7 * 10-8 %  
25
2 * 10-7 %  
22
Abundance In Sun
~0.0000001 %  
26
~0.0000004 %  
23
Abundance In Meteorites
0.00 %  
37
0.00 %  
35
Abundance In Earth's Crust
0.00 %  
31
0.00 %  
25
Abundance In Oceans
0.00 %  
27
0.00 %  
34
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.
  
  • Niobium alloys are used in jet engines and rockets and spacecraft, beams and girders for buildings and oil and gas pipelines.
  • It is used superconducting magnets in particles accelerators, NMR and MRI equipment.
  
Industrial Uses
Ammunition Industry  
Aerospace Industry, Ammunition Industry, Electrical Industry, Electronic Industry  
Medical Uses
NA  
NA  
Other Uses
Alloys, In Nuclear Reactors, Nuclear Research, Research Purposes  
Alloys  
Biological Properties
  
  
Toxicity
Toxic  
Low Toxic  
Present in Human Body
No  
Yes  
In Blood
Not Available  
0.01 Blood/mg dm-3  
25
In Bone
Not Available  
0.07 p.p.m.  
25
Physical Properties
Melting Point
2,150.00 °C  
10
2,468.00 °C  
6
Boiling Point
5,400.00 °C  
5
2,468.00 °C  
99+
Appearance
  
  
Physical State
Solid  
Solid  
Color
Gray  
Gray  
Luster
Metallic  
Metallic  
Hardness
  
  
Mohs Hardness
5.50  
7
6.00  
6
Brinell Hardness
1,450.00 MPa  
6
735.00 MPa  
14
Vickers Hardness
1,520.00 MPa  
5
870.00 MPa  
12
Speed of Sound
3,010.00 m/s  
27
3,480.00 m/s  
21
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
Hf  
Nb  
Isotopes
  
  
Known Isotopes
32  
7
17  
22
Electronegativity
  
  
Pauling Electronegativity
1.30  
32
1.60  
23
Sanderson Electronegativity
Not Available  
1.42  
16
Allred Rochow Electronegativity
1.23  
25
1.23  
25
Allen Electronegativity
1.16  
37
1.41  
31
Electropositivity
  
  
Pauling Electropositivity
2.70  
22
2.40  
31
Ionization Energies
  
  
1st Energy Level
658.50 kJ/mol  
40
652.10 kJ/mol  
99+
2nd Energy Level
1,440.00 kJ/mol  
99+
1,380.00 kJ/mol  
99+
3rd Energy Level
2,250.00 kJ/mol  
99+
2,416.00 kJ/mol  
99+
4th Energy Level
3,216.00 kJ/mol  
99+
3,700.00 kJ/mol  
99+
5th Energy Level
Not Available  
4,877.00 kJ/mol  
36
6th Energy Level
Not Available  
9,847.00 kJ/mol  
11
7th Energy level
Not Available  
12,100.00 kJ/mol  
14
Electrochemical Equivalent
1.66 g/amp-hr  
99+
0.69 g/amp-hr  
99+
Electron Work Function
3.90 eV  
27
4.30 eV  
18
Other Chemical Properties
Anti Corrosion, Ionization, Radioactive Isotopes, Solubility  
Anti Corrosion, Ionization, Radioactive Isotopes, Solubility  
Atomic Properties
Atomic Number
72  
99+
41  
99+
Electron Configuration
[Xe] 4f14 5d2 6s2  
[Kr] 4d4 5s1  
Crystal Structure
Hexagonal Close Packed (HCP)  
Body Centered Cubic (BCC)  
Crystal Lattice
BCC-Crystal-Structure-.jpg#100  
BCC-Crystal-Structure-.jpg#100  
Atom
  
  
Number of Protons
72  
99+
41  
99+
Number of Neutrons
106  
29
52  
99+
Number of Electrons
72  
99+
41  
99+
Radius of an Atom
  
  
Atomic Radius
159.00 pm  
28
146.00 pm  
35
Covalent Radius
175.00 pm  
23
164.00 pm  
28
Van der Waals Radius
200.00 pm  
28
200.00 pm  
28
Atomic Weight
178.49 amu  
39
92.91 amu  
99+
Atomic Volume
13.60 cm3/mol  
38
10.87 cm3/mol  
99+
Adjacent Atomic Numbers
  
  
Previous Element
Lutetium
  
Zirconium
  
Next Element
Tantalum
  
Molybdenum
  
Valence Electron Potential
81.00 (-eV)  
16
104.00 (-eV)  
8
Lattice Constant
319.64 pm  
99+
330.04 pm  
99+
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
8.57 g/cm3  
99+
Density When Liquid (at m.p.)
12.00 g/cm3  
12
Not Available  
Tensile Strength
445.00 MPa  
8
330.00 MPa  
12
Viscosity
Not Available  
Not Available  
Vapor Pressure
  
  
Vapor Pressure at 2000 K
0.00 (Pa)  
24
0.00 (Pa)  
27
Elasticity properties
  
  
Shear Modulus
30.00 GPa  
23
38.00 GPa  
19
Bulk Modulus
110.00 GPa  
15
170.00 GPa  
10
Young's Modulus
78.00 GPa  
25
105.00 GPa  
20
Poisson Ratio
0.37  
7
0.40  
4
Other Mechanical Properties
Ductile, Malleable  
Ductile, Malleable  
Magnetic Properties
Magnetic Characteristics
  
  
Specific Gravity
13.31  
18
8.57  
37
Magnetic Ordering
Paramagnetic  
Paramagnetic  
Electrical Properties
  
  
Electrical Property
Conductor  
Conductor  
Resistivity
331.00 nΩ·m  
14
152.00 nΩ·m  
23
Electrical Conductivity
0.03 106/cm Ω  
39
0.07 106/cm Ω  
28
Electron Affinity
0.00 kJ/mol  
40
86.10 kJ/mol  
12
Thermal Properties
Specific Heat
0.14 J/(kg K)  
37
0.26 J/(kg K)  
20
Molar Heat Capacity
25.73 J/mol·K  
36
24.60 J/mol·K  
99+
Thermal Conductivity
23.00 W/m·K  
99+
53.70 W/m·K  
29
Critical Temperature
Not Available  
Not Available  
Thermal Expansion
5.90 µm/(m·K)  
99+
7.30 µm/(m·K)  
99+
Enthalpy
  
  
Enthalpy of Vaporization
661.10 kJ/mol  
5
696.60 kJ/mol  
4
Enthalpy of Fusion
25.10 kJ/mol  
8
27.20 kJ/mol  
6
Enthalpy of Atomization
703.00 kJ/mol  
5
745.00 kJ/mol  
4
Standard Molar Entropy
43.60 J/mol.K  
34
36.40 J/mol.K  
99+
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