High-density barium titanate of high permittivity

Plastic and nonmetallic article shaping or treating: processes – Direct application of electrical or wave energy to work – Producing or treating inorganic material – not as pigments,...

Reexamination Certificate

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C264S455000, C264S483000, C501S137000

Reexamination Certificate

active

06905649

ABSTRACT:
A nano-sized powder of barium titanate is compacted and sintered by spark plasma sintering under conditions creating a high heating rate to achieve a densified material that demonstrates superior permittivity.

REFERENCES:
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patent: 6395214 (2002-05-01), Kear et al.
patent: 0992468 (2000-12-01), None
Takeuchi et al., “Spark-plasma-sintering of fine BaTiO3powder prepared by a sol-crystal method”,Journal of Materials Science36:2329-2334 (2001), no month provided.
Takeuchi et al., “Preparation of fine-grained BaTiO3ceramics by spark plasma sintering”,J. Mater. Res.,17:3: 575-581 (2002), no month provided.
Takeuchi et al., “Preparation of Dense BaTiO3Ceramics with Submicrometer Grains by Spark Plasma Sintering”,J. Am. Ceram. Soc.82:4: 939-943 (1999), no month provided.
Xu et al., “Tetragonal Nanocrystalline Barlum Titanate Powder: Preparation, Characterization, and Dielectric Properties”,J. Am. Ceram. Soc.86:1: 203-205 (2003), no month provided.
Choi et al., “Hydrothermal Synthesis of Spherical Perovskite Oxide Powders Using Spherical Gel Powders”,J. Am. Ceram. Soc.81:5: 1353-1356 (1998), no month provided.
Hu et al., Wet-chemical synthesis of monodispersed barium titanate particles-hydrothermal conversion of TiO2microspheres to nanocrystalline BaTiO3Powder Technology110: 2-14 (2000), no month provided.
Wang et al., “Densification of Al2O3powder using spark plasma sintering”, J. Mater. Res., 15:4:982-987 (2000), no month provided.

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