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Periodic Table
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Silicon
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| Atomic # |
14 |
28.1 |
Weight |
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Si
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1410 |
Melting Pt, °C 1 atm |
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2355 |
Boiling Pt, °C 1 atm |
| Electro-
negativity |
1.9 |
1.5 |
2.3 |
Density, g/cm3 |
| 1st Ionizn
Potential |
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8.15 |
0.4 |
1.49 |
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Th Cond, W, 25°C |
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Atomic/
Ionic Rad |
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Pictures of a crystal
model |
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Estimates
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Model: |
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Real: |
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Distance
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001 spacing (sp) = 1 |
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Lattice constant of 0.5431 nm |
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Time
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Mass
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mass = 1 |
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4.7 10(-26) kg/atom |
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Force & Energy
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Heat Capacity
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Speed of Sound
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Estimated sound speed of 0.012 sp/iter, or 6.6
pm/iter |
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Sound speed of 940 or 8000 m/s implies 0.8 - 7.0
fs/iteration |
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Elastic Moduli
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very rough estimate: Strain 1.25, Shear
0.57, ratio 2.2. Units of ma/(sp it2) gives strain 2200
GPa, shear 1000 GPa (7.0 fs/iter). |
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Strain modulus of 155.8 GPa, Shear Modulus of
64.1 GPa, ratio of 2.4. |
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Physical Properties
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¡¡¡ These values must be double
checked !!!
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| Atomic Weight |
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28.0855 |
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| Isotopes |
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28 |
-92.23% |
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29 |
-4.67% |
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30 |
-3.10% |
| Atomic Number |
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14 |
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| Atomic Radius (covalent bond) |
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177 |
pm |
| Ionic Radius |
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40 |
pm |
| Density (solid) |
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2.33 |
g/cm**3 |
| Density (liquid) |
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2.53 |
g/cm**3 |
| Atomic density |
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5.00E+22 |
atoms/cm**3 |
| Atoms per unit cell |
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8 |
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| crystal structure: |
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diamond |
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| surface density |
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| -100 |
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6.78E+14 |
/cm**2 |
| -110 |
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9.59E+14 |
/cm**2 |
| -111 |
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7.83E+14 |
/cm**2 |
| Lattice Constant |
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5.431 |
angstrom |
| Bond Length |
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2.36 |
angstrom |
| Thermal Cond (solid) |
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1.412 |
W/cm-K |
| Thermal Cond (liquid) |
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4.3 |
W/cm-K |
| Specific Heat |
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0.7 |
J/g-K |
| Thermal Diffusivity |
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0.9 |
cm**2/s |
| Melting Point |
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1683 |
K |
| Boiling Point |
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2628 |
K |
| Critical Temperature |
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5159 |
K |
| Density (solid) |
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2.33 |
g/cm**3 |
| Density (liquid) |
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2.53 |
g/cm**3 |
| Vapor pressure |
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| at 1050C |
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1e-7 Torr |
| at 1250C |
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1e-5 Torr |
| Molar heat capacity |
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20 |
J/mol-K |
| Coefficient of Thermal |
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| Linear Expansion |
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2.60E-06 |
/K |
| C11 = |
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165.7 |
GPa |
| C12 = |
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63.9 |
GPa |
| C44 = |
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79.6 |
GPa |
| Young's Modulus (E) = |
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155.8 |
GPa |
| Poisson's Ratio |
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0.2152 |
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| Shear Modulus |
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64.1 |
GPa |
| Speed of Sound |
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940 |
m/s |
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Calculated ( sqrt(E/p) )
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8177 |
m/s |
| Molar heat capacity |
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20 |
J/mol-K |
| Average energy loss |
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| per phonon scattering |
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0.063 |
eV |
| Optical phonon |
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| free path |
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| electrons |
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6.2 |
nm |
| holes |
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4.5 |
nm |
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| Many values
taken from Tom Knight's
page |
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2-D Triangular Lattice
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