2026-03-12T23:02:41Z https://nagoya.repo.nii.ac.jp/oai

oai:nagoya.repo.nii.ac.jp:00024933 2023-01-16T04:15:31Z 673:674:675

Fabrication and properties of nonreducible lead-free piezoelectric Mn-doped (Ba,Ca)TiO3 ceramics Sakamoto, Wataru Noritake, Kouta Ichikawa, Hiroki Hayashi, Koichiro Yogo, Toshinobu BaTiO3 and titanates Dielectric properties Piezoelectric properties Mn doping 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. journal article Wiley 2017-08 application/pdf CERAMICS INTERNATIONAL supplemet1 43 s166 s171 0272-8842 https://nagoya.repo.nii.ac.jp/record/24933/files/Final_Manuscript_Sakamoto_Ceram_Int_2017.pdf http://hdl.handle.net/2237/27155 https://nagoya.repo.nii.ac.jp/records/24933 eng https://doi.org/10.1016/j.ceramint.2017.05.291 © 2017. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/