a poor homogeneity and densification, with big non-percolated aggregates of NZF octahedral crystals and large pores for the method (i) and more homogeneous microstructures with good dispersion of BT perovskite grains and spinel NZF octahedral crystals and small pores were found in ceramics prepared by the method (ii) when the formation of NZF
hard aggregates is strongly inhibited.