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8 Cards in this Set
- Front
- Back
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What is a Brillouin Zone? |
A Brillouin Zone is the boundary in the reciprocal lattice where scattering will occur. |
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In Ewald Construction, what equation links the Incident wave vector to the reciprocal lattice? And where does this equation only apply? |
KCos(theta) = G/2 |
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How is the diffraction Condition satisfied. |
If K lies in the plane that perpendicularly bisects G |
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What is the primitive unit cell in Reciprocal Space? |
A Brillouin Zone |
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What is the primitive unit cell in Real Space? |
A Wigner-Seitz Cell |
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How do Replusive Forces come about? |
-> Caused by the overlapping of the electron clouds -> Pauli exclusion principle states "no two fermions with the same spin can occupy the same state -> Repulsive foces vary quickly with distance, represented by the high power law. F ∝ 1/r^13 |
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Name all 'Primary' bonds and describe them |
Covalent - Electrons are shred between neighbouring atoms Ionic - Complete transfer of an electron from one atom to a neighbouring atom Metallic - Electrons are de-localised |
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Name all 'Secondary' bonds and describe them |
Van der Waals - No electron transfer (long range forces bond atoms Hydrogen Bonds - electrostatic attraction |
