Identification and Effect of Secondary Phase in MnO 2 ‐Doped 0.8Pb(Zr 0.52 Ti 0.48 )O 3 –0.2Pb(Zn 1/3 Nb 2/3 )O 3 Piezoelectric Ceramics

0.8 Pb(Zr 0.52 Ti 0.48 )O 3 –0.2 Pb(Zn 1/3 Nb 2/3 )O 3 (PZT–PZN) and 2 mol% Mn‐doped PZT–PZN ceramics were investigated to deterministically identify the presence and effect of the secondary phase in controlling electrical properties. On the basis of the X‐ray diffraction and energy dispersive spectroscopy analysis, we show that secondary phase in Mn‐doped PZT–PZN is not MnO 2 precipitate, but it is related to the formation of ZnO. This result was found to be consistent with the grain growth observed in the Mn‐doped sintered ceramics and changes in ferroelectric behavior. We propose that Mn 3+ substitution on Ti and Zr site induces hardening effect, whereas Mn 2+ substitution on Zn‐site stabilizes the perovskite phase in synthesis of PZT–PZN.