Title:
FERROELECTRIC GLASS COMPOSITION AND PROCESS FOR PRODUCING THE SAME
Document Type and Number:
WIPO Patent Application WO/2005/061403
Kind Code:
A1
Abstract:
A glass composition characterized in that in oxide form, BaO, SrO, TiO2, SiO2 and Al2O3 are contained and when the respective contents are expressed in terms of molecular concentration ratio, BaO+SrO+TiO2=0.2 to 0.8, SiO2=0.1 to 0.6 and Al2O3=0.05 to 0.25, provided that when the total amount of SrO and BaO is 1, (1-x)BaO+xSrO=1 in which x=0.1 to 0.7, and in that the Curie temperature thereof is in the range of -100 to 80°C. There is further provided a process for producing a ferroelectric glass composition as mentioned above, comprising, with the use of AlF3 as a raw material becoming Al2O3 in the glass composition, melting raw material powder at 1300 to 1400°C, quenching so as to obtain glass powder and firing the same at 900 to 1200°C. Thus, a ferroelectric glass composition capable of being fired at low temperature and facilitating control of Curie temperature for use in capacitor devices with capacity variable depending on applied voltage and a process for producing the same can be made available.
Inventors:
KAGEYAMA KEISUKE (JP)
TAKAHASHI JUNICHI (JP)
TAKAHASHI JUNICHI (JP)
Application Number:
PCT/JP2004/018902
Publication Date:
July 07, 2005
Filing Date:
December 17, 2004
Export Citation:
Assignee:
MURATA MANUFACTURING CO (JP)
KAGEYAMA KEISUKE (JP)
TAKAHASHI JUNICHI (JP)
KAGEYAMA KEISUKE (JP)
TAKAHASHI JUNICHI (JP)
International Classes:
C03C10/00; C03C10/02; H01B3/08; (IPC1-7): C03C10/02; H01B3/08
Foreign References:
| JP2003221277A | 2003-08-05 | |||
| JPH08109038A | 1996-04-30 |
Other References:
SAKUHANA S. ET AL: "f.Fukkabutsu (fluoride)", GLASS HANDBOOK, KABUSHIKI KAISHA ASAKURA SHOTEN, 3 September 1975 (1975-09-03), pages 297, XP002989379
Attorney, Agent or Firm:
Fukami, Hisao (Mitsui Sumitomo Bank Minamimorimachi Bldg.
1-29, Minamimorimachi 2-chome, Kita-ku, Osaka-sh, Osaka 54, JP)
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