Question

BaTiO3 has perovskite structure with Ba2+ ions at the corners, O2– ions at the center of each face and Ti4+ ions at the center of a cubic unit cell. What is the number of Ti4+ ions nearest to Ba2+

Answer 1

Explanation:

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Answer 2

Ti4+ ion occupy 25% of octahedral holes

Explanation:

Given: BaTiO3 has perovskite structure with Ba2+ ions at the corners, O2– ions at the center of each face and Ti4+ ions at the center of a cubic unit cell.

Find: What is the number of Ti4+ ions nearest to Ba2+?

Solution:  

Ti4+ ion is present in the octahedral void. The octahedral void forms the centre of the FCC unit cell. There are 4 octahedral voids in every FCC unit cell. Since only one of the four voids are captured, there is only 1/4 occupancy = 25% occupancy.