Why does grain size increase with increasing dopant concentration in case of Fe doped BaTiO3 ceramics ?

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Aleksander Recnik

Do you observe (111) twins in BaTiO3 grains? They could form on doping with 3+ cations and trigger exaggerated grain growth. Check you microstructures for twins.

Ali Sari

It could be that the presence of iron (Fe3+, Fe2+) promotes the formation of a second phase which is formed in the matrix of BaTiO3.