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Saturday, April 17, 2021

Pervoskite (ABO3) type structure:

ABQ3 is a proto type solid where A is a divalent cation  and B is a tetravalent cation.

A+2 = Divalent cations

B+4 =Tetravalent cations

In Pervoskite structure:

A+2 = placed at corner of cubic unit cell

O-2 = placed at all the face centre

That means A+2 and O-2 ions combinelly form CCP/FCC like structure  and

B+4 = Tetravalent cations occupy the central octahedral voids (25% of total OV) i.e centre of the centre of the unit cell so general formula is ABO3

Other examples are BaTiO3, SrTiO3

Related Questions:

What are the normal spinel structures?

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