@article{oai:nagoya.repo.nii.ac.jp:00024933, author = {Sakamoto, Wataru and Noritake, Kouta and Ichikawa, Hiroki and Hayashi, Koichiro and Yogo, Toshinobu}, issue = {supplemet1}, journal = {CERAMICS INTERNATIONAL}, month = {Aug}, note = {Nonreducible lead-free (Ba,Ca)TiO3 piezoceramics were fabricated by controlling the level of Mn doping. Similar to Mn-doped (Ba0.85Ca0.15)TiO3 ceramics sintered in air, stable dielectric properties with temperature change were achieved for the nonreducible sample by stabilizing the tetragonal phase of BaTiO3 over a wide temperature range. In addition, optimization of the level of Mn doping was very effective in improving the sintered density and electrical resistivity for (Ba0.85Ca0.15)TiO3 ceramics sintered under a low oxygen partial pressure. The valence state of doped Mn in nonreducible (Ba,Ca)TiO3 after sintering was confirmed to be Mn2+ or Mn3+ by electron spin resonance analysis. Sintered bodies of 1 mol% Ba excess and 1 mol% Mn-doped (Ba0.85Ca0.15)TiO3, which were sintered at 1350°C in a H2(0.3%)/Ar atmosphere, exhibited sufficient sintered density and resistivity to allow the characterization of several electrical properties. The ferroelectric, field-induced strain, and piezoelectric properties of the nonreducible (Ba0.85Ca0.15)TiO3 ceramics sintered in the reducing atmosphere were comparable with those of (Ba0.85Ca0.15)TiO3 samples sintered in air.}, pages = {s166--s171}, title = {Fabrication and properties of nonreducible lead-free piezoelectric Mn-doped (Ba,Ca)TiO3 ceramics}, volume = {43}, year = {2017} }