Title:
DIELECTRIC CERAMIC AND ITS MANUFACTURE AND LAMINATED CERAMIC ELECTRONIC PART AND ITS MANUFACTURE
Document Type and Number:
Japanese Patent JP3391269
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a dielectric ceramic suitable for constituting a dielectric layer for a laminated ceramic capacitor or the like in which the temperature characteristic of an electrostatic capacity are satisfactory, and base metal such as nickel can be used as inside conductive materials, and burning can be attained in reducing atmosphere.
SOLUTION: This dielectric ceramic can be obtained by burning barium titanate-based powder in which the ratio of (c) axis/(a) axis of a perovskite structure is 1.003-1.010, and OH group quantity in a crystal lattice is 1 wt.% or less. It is desired that the barium titanate powder as raw material has the maximum grain size of 0.5 μm or less, and the mean grain size of 0.1-0.3 μm, and one power grain is constituted of a low crystalline part 21 and a high crystalline part 23 and the diameter of the low crystalline part 21 is 0.65 of the powder grain size or less. Moreover, conspicuous grain growth is suppressed so that a ratio R of (the mean grain size of the dielectric ceramic after burning)/(the mean grain size of the barium titanate powder of the raw material) may be in the range from 0.90-1.2 at the time of burning.
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Inventors:
Nobuyuki Wada
Jun Ikeda
Takashi Hiramatsu
Yukio Hamachi
Jun Ikeda
Takashi Hiramatsu
Yukio Hamachi
Application Number:
JP23673698A
Publication Date:
March 31, 2003
Filing Date:
August 24, 1998
Export Citation:
Assignee:
MURATA MANUFACTURING CO.,LTD.
International Classes:
C04B35/46; C04B35/468; H01G4/12; (IPC1-7): H01G4/12; C04B35/46
Domestic Patent References:
| JP4349168A | ||||
| JP660721A |
Attorney, Agent or Firm:
Masaaki Koshiba (1 outside)