Effects of Manganese Addition on Piezoelectric Properties of Pb(Zr_<0.5>Ti_<0.5>)O_3

概要

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The effects of MnO_2 addition on k_<31> and 〓_m were investigated for Pb(Zr_<0.5>Ti_<0.5>)O_3(PZT). The MnO_2 addition increased 〓_m and k_<31> in a low poling field. This result indicated that Mn-doped PZT possessed properties of 'soft' and 'hard' piezoelectrics simultaneously. Electron spin resonance measurement indicated that Mn^<2+>, Mn^<3+> and Mn^<4+> coexisted in PZT. The tetragonality of the PZT lattice and the Curie temperature decreased with MnO_2 content. From these results, it was found that the increase in k_<31> of Mn-doped PZT was due to the change of the crystal structure toward a cubic system, and the increase in 〓_m to Mn^<2+> and Mn^<3+>" ions working as acceptor dopants. The characteristic feature of Mn is that its addition to PZT decreases tetragonality, and various valence states coexist in proper ratio in Mn-doped PZT sintered in atmosphere.
社団法人応用物理学会の論文
1992-09-30