Synthesis and Dielectric Properties of Mn-Doped BaTi₂O₅ Ceramics

• Yukikuni Akishige

• Kazuo Honda

• Shinya Tsukada

抄録

High-density ceramics of BaTi 2 O 5 have been fabricated by a conventional sintering method using both sol–gel-derived BaTi 2 O 5 powders and MnO 2 additives of 0.2–0.8 wt %. The effects of sintering conditions on the densification, microstructural evolution and dielectric properties are investigated. As the effect of Mn addition, the BaTi 2 O 5 phase becomes stable at least up to 1250 °C, and a significant densification is achieved at temperatures as low as 1200–1250 °C. The dielectric constant ε' vs temperature T curve of the MnO 2 -added ceramics exhibits a broad maximum ε' max at the ferroelectric phase transition temperature T C , which is 140 °C lower than that of the nondoped ceramics. Among the ceramics with different Mn contents, the 0.2 wt % MnO 2 -added ceramics have the largest ε' max of 470 at 328 °C and the smallest tan δ of <0.05 at a high temperature of around 520 °C at 1 MHz. We observed a ferroelectric D – E hysteresis loop for the first time in the polycrystalline form of BaTi 2 O 5 .

収録刊行物

• Japanese Journal of Applied Physics

  Japanese Journal of Applied Physics 50 (9S2), 09NC10-, 2011-09-01

  IOP Publishing

キーワード

• General Physics and Astronomy
• General Engineering

詳細情報

• CRID: 1360284921833238400
• NII論文ID: 210000071282
• DOI: 10.1143/jjap.50.09nc10
• ISSN: 13474065
• ISSN: 00214922
• ISSN: http://id.crossref.org/issn/13474065
• Web Site: https://iopscience.iop.org/article/10.1143/JJAP.50.09NC10
• Web Site: https://iopscience.iop.org/article/10.1143/JJAP.50.09NC10/pdf
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