Dielectric properties of fine-grained barium titanate ceramics

• G. Arlt

  Institut für Werkstoffe der Elektrotechnik, Technical University Aachen, Federal Republic of Germany

• D. Hennings

  Philips Research Laboratory Aachen, 5100 Aachen, Federal Republic of Germany

• G. de With

  Philips Research Laboratories POB 8000, 5600 JA Eindhoven, The Netherlands

抄録

Dielectric properties, lattice- and microstructure of ceramic BaTiO3 showing grain sizes of 0.3–100 μm were studied. At grain sizes <10 μm the width of ferroelectric 90° domains decreases proportionally to the square root of the grain diameter. The decreasing width of the domains can be theoretically explained by the equilibrium of elastic field energy and domain wall energy. The smaller the grains, the more the dielectric and the elastic constants are determined by the contribution of 90° domain walls. The permittivity below the Curie point shows a pronounced maximum εr ≊5000 at grain sizes 0.8–1 μm. At grain sizes <0.7 μm the permittivity strongly decreases and the lattice gradually changes from tetragonal to pseudocubic.

収録刊行物

• Journal of Applied Physics

  Journal of Applied Physics 58 (4), 1619-1625, 1985-08-15

  AIP Publishing

キーワード

• General Physics and Astronomy

詳細情報

• CRID: 1362825893451698944
• NII論文ID: 80002603622
• NII書誌ID: AA00693547
• DOI: 10.1063/1.336051
• ISSN: 10897550
• ISSN: 00218979
• Web Site: https://pubs.aip.org/aip/jap/article-pdf/58/4/1619/18412389/1619_1_online.pdf
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