Fabrication and properties of nonreducible lead-free piezoelectric Mn-doped (Ba,Ca)TiO3 ceramics

Wataru Sakamoto; Kouta Noritake; Hiroki Ichikawa; Koichiro Hayashi; Toshinobu Yogo

doi:10.1016/j.ceramint.2017.05.291

Fabrication and properties of nonreducible lead-free piezoelectric Mn-doped (Ba,Ca)TiO₃ ceramics

Wataru Sakamoto, Kouta Noritake, Hiroki Ichikawa, Koichiro Hayashi, Toshinobu Yogo

Research output: Contribution to journal › Article › peer-review

17 Citations (Scopus)

Abstract

Nonreducible lead-free (Ba,Ca)TiO₃ piezoceramics were fabricated by controlling the level of Mn doping. Similar to Mn-doped (Ba_0.85Ca_0.15)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 (Ba_0.85Ca_0.15)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 (Ba_0.85Ca_0.15)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 (Ba_0.85Ca_0.15)TiO₃ ceramics sintered in the reducing atmosphere were comparable with those of (Ba_0.85Ca_0.15)TiO₃ samples sintered in air.

Original language	English
Pages (from-to)	S166-S171
Journal	Ceramics International
Volume	43
DOIs	https://doi.org/10.1016/j.ceramint.2017.05.291
Publication status	Published - Aug 2017
Externally published	Yes

All Science Journal Classification (ASJC) codes

Electronic, Optical and Magnetic Materials
Ceramics and Composites
Process Chemistry and Technology
Surfaces, Coatings and Films
Materials Chemistry

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10.1016/j.ceramint.2017.05.291

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title = "Fabrication and properties of nonreducible lead-free piezoelectric Mn-doped (Ba,Ca)TiO3 ceramics",

abstract = "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.",

author = "Wataru Sakamoto and Kouta Noritake and Hiroki Ichikawa and Koichiro Hayashi and Toshinobu Yogo",

note = "Publisher Copyright: {\textcopyright} 2017 Elsevier Ltd and Techna Group S.r.l.",

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T1 - Fabrication and properties of nonreducible lead-free piezoelectric Mn-doped (Ba,Ca)TiO3 ceramics

AU - Sakamoto, Wataru

AU - Noritake, Kouta

AU - Ichikawa, Hiroki

AU - Hayashi, Koichiro

AU - Yogo, Toshinobu

PY - 2017/8

Y1 - 2017/8

N2 - 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.

AB - 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.

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JO - Ceramics International

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Fabrication and properties of nonreducible lead-free piezoelectric Mn-doped (Ba,Ca)TiO₃ ceramics

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