Title:
PYROELECTRIC CERAMIC COMPOSITION, PYROELECTRIC ELEMENT, AND INFRARED DETECTOR
Document Type and Number:
WIPO Patent Application WO/2007/125664
Kind Code:
A1
Abstract:
This invention provides a pyroelectric ceramic composition comprising a compound
represented by general formula (Pb1-xCax)(1+a){(Ni1/3Nb2/3)yTi(1-y)}O3,
wherein x, y and a are 0.20 ≤ x ≤ 0.27, 0.01 ≤ y ≤ 0.06
and 0.001 ≤ a ≤ 0.02, respectively, as a main component and containing
0.3 to 2.5 moles of Mn based on 100 moles of the main component. A segregation product
containing Ni, Ti and Mn is contained in an amount of not more than 1.0 vol% (including
0 vol%) in a fired sinter. The above constitution can realize a pyroelectric ceramic
composition that has a properly low insulating resistance and, at the same time,
has good pyroelectric properties while having a high Curie temperature. Since
the composition has a high Curie temperature, a thin-layer and small-size pyroelectric
element, which can be subjected to reflow treatment, can be provided. Since the
composition has low insulating resistance, in an infrared detector comprising
a pyroelectric element using the above composition, there is no need to provide
any load resistor parallel to the pyroelectric element. Accordingly, a size
reduction can be realized.
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Inventors:
ISHII HIDEKI (JP)
HORIKAWA KATSUHIRO (JP)
HAYASHI KOJI (JP)
HORIKAWA KATSUHIRO (JP)
HAYASHI KOJI (JP)
Application Number:
PCT/JP2007/052349
Publication Date:
November 08, 2007
Filing Date:
February 09, 2007
Export Citation:
Assignee:
MURATA MANUFACTURING CO (JP)
ISHII HIDEKI (JP)
HORIKAWA KATSUHIRO (JP)
HAYASHI KOJI (JP)
ISHII HIDEKI (JP)
HORIKAWA KATSUHIRO (JP)
HAYASHI KOJI (JP)
International Classes:
C04B35/472; G01J1/02; H01B3/12; H01L37/02
Foreign References:
| JPH01261876A | 1989-10-18 | |||
| JPH09159524A | 1997-06-20 | |||
| JPH02246274A | 1990-10-02 | |||
| JPH01261876A | 1989-10-18 |
Other References:
See also references of EP 2017239A4
Attorney, Agent or Firm:
KUNIHIRO, Yasutoshi (14-10 Nishinakajima 5-chome,,Yodogawaku, Osaka-shi, Osaka11, JP)
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