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Please explain Niggli notation -- specifically for Al2O3 (corundum). How do you you write the com...

Please explain Niggli notation -- specifically for Al2O3 (corundum). How do you you write the composition of corundum in Niggli notation?

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Answer #1

The Niggli-notation of Al2O3 can be written as follows.

3 C) 3 5-The explanation is provided in the right of the Curly brackets in the above notation.

Al2O3 = 2Al + 3O

= 1Al + (3/2)O

= 1Al + (3/2 + 1)O (If you increase the number of oxygens by 1, then the charge on the whole species increases by -2)

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