Energy Bands and Molecular Orbitals

  • #1

Main Question or Discussion Point

Hello, a newbie here. I need to understand the relationship between MO and Energy Bands.

Although i have searched and researched about this topic in Google, but i am yet to understand this part clearly.

It is said that Energy Bands occur as the number of MO increase due to the various atoms that are interlinked in a crystal structure.

But i can't help but wonder.
While K has its σ state fully filled and its σ* state empty, and yet behaves as a conductor
But Si has ∏px and ∏py states partially filled which means when bands form, Si should have some bands which are partially filled and hence should be good conductors while Na should behave more of a semiconductor way... but it is just the opposite. Why?
 

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Answers and Replies

  • #2
DrDu
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The diagram you show seems to be for diatomic molecules while the band structure refers to infinitely large crystals. Why do you think the two are comparable?
 
  • #3
The diagram you show seems to be for diatomic molecules while the band structure refers to infinitely large crystals. Why do you think the two are comparable?
Then what should i do to get a clearer picture of the MO and Energy Band conduction??
 
  • #4
DrDu
Science Advisor
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755

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