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.