Electron microscopy
 
Bonding Energies and Melting Temperatures of Substances
- Practical Electron Microscopy and Database -
- An Online Book -
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This book (Practical Electron Microscopy and Database) is a reference for TEM and SEM students, operators, engineers, technicians, managers, and researchers.
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As listed in Table 3239, substances with large bonding energies usually have high melting temperatures.

Table 3239. Bonding energies and melting temperatures of different substances*.

Bonding type

Substance
Bonding energy
Melting point (°C)
kJ/mol kcal/mol eV/Atom, Ion, or Molecule
Typical value 50-1000      
NaCl 640 153 3.3 801
MgO 1000 239 5.2 2800
 
Typical value 200-1000      
Si 450 108 4.7 1410
Diamond C 713 170 7.4 >3550
 
Typical value 50-1000      
Hg 68 16 0.7 -39
Al 324 77 3.4 660
Fe 406 97 4.2 1538
W 849 203 8.8 3410
 
Typical value 0.1-35      
Ar 7.7 1.8 0.08 -189
Cl2 31 7.4 0.32 -101
 
Typical value 10-55      
NH3 35 8.4 0.36 -78
H2O 51 12.2 0.52 0

           * The one which has the largest bonding energy and highest melting point in the same bond-type of substances is colored in red, while the lowest is colored in green.

Figure 3239 shows the melting point plotted against the bonding energy for different interatomic bonds.

Melting point plotted against bonding energy for different interatomic bonds

Figure 3239. Melting point plotted against bonding energy for different interatomic bonds.

 

 

 

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