Abstract
The use of additives as a sintering aid for promoting densification is well-known in processing structural ceramics. In leaky ferroelectric ceramics (e.g., BiFeO3-based systems), additives are also used to reduce the leakage current, improve the poling efficiency and the piezoelectric response of a material. A less investigated aspect is how additives affect the multiferroic (ferroelectric and magnetic) features of BiFeO3-based ceramics. In this work, we report a systematic study of the effect of different additives viz, MnO2, CuO, K2CO3 and KMnO4 on the microstructural, electromechanical, and magnetic properties of Dy-modified BiFeO3–PbTiO3. We found that all the additives help in the precipitation of the ferrimagnetic dysprosium iron garnet phase. The additives containing potassium (K) tend to suppress the grain size. We found that the best combination of ferroelectric and ferromagnetic behaviour was found in a mixture of additives.
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