Coated spherical tetragonal barium titanate particles and...

Chemistry of inorganic compounds – With additive – Coating or binder

Reexamination Certificate

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C501S126000, C501S133000, C501S137000, C501S139000, C427S215000, C428S403000, C428S404000, C361S321200

Reexamination Certificate

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07431908

ABSTRACT:
Spherical tetragonal barium titanate particles of the present invention have a perovskite crystal structure, an average particle diameter of 0.05 to 0.5 μm, a particle size distribution σg of not less than 0.70, and a ratio of Ba to Ti of 0.99:1 to 1.01:1. The spherical tetragonal barium titanate particles exhibit an excellent dispersibility as well as a high denseness, a high purity and excellent permittivity properties.

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patent: 6169049 (2001-01-01), Witham et al.
patent: 5-330824 (1993-12-01), None
Uchino et al: “Dependence of the Crystal Structure on Particle Size in Barium Titanate,” pp. 1555-1558,J. Am. Ceram. Soc., 72 1555-58 (1989).
Vivekanandan et al: “Characterization of Barium Titanate Fine Powders Formed From Hydrothermal Crystallization,” Powder Technology, 57 (1989) pp. 181-19.
Begg et al: “Effect of Particle Size on the Room-Temperature Crystal Structure of Barium Titanate,” pp. 3186-3192,J. Am. Ceram. Soc., 77 3186-92 (1994).
Ikawa et al: “Size Effect on Low Temperature Phase Transformations in BaTiO3Fine Powders Analyzed by Heat Capacity,” Dept. of App. Chemistry Book 1 pp. 447-450, date unknown.

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