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Pyroelectric ceramic composition, pyroelectric element, and infrared detector

A technology of infrared detector and ceramic composition, which is applied to electric radiation detectors, electrical components, pyroelectric devices, etc., can solve the problems of reduced pyroelectric characteristics, inability to realize infrared detectors, etc., and achieves appropriate reduction in insulation resistance and stable sensor characteristics. , the effect of small fluctuations relative to temperature changes

Active Publication Date: 2009-05-20
MURATA MFG CO LTD
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0014] However, when a thermoelectric element using the pyroelectric ceramic composition of Patent Document 1 is mounted on a substrate by a reflow method, there is a problem that the thermoelectric characteristics are lowered.
Therefore, the current situation is that a surface mount type infrared detector that can be mounted on a substrate by a reflow process has not yet been realized.

Method used

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  • Pyroelectric ceramic composition, pyroelectric element, and infrared detector
  • Pyroelectric ceramic composition, pyroelectric element, and infrared detector
  • Pyroelectric ceramic composition, pyroelectric element, and infrared detector

Examples

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Embodiment

[0093] Next, examples of the present invention will be described in detail.

[0094] First, prepare Pb as a ceramic raw material 3 o 4 , CaCO 3 , NiO, Nb 2 o 5 、TiO 2 and MnCO 3 , so that the composition shown in Table 1 was weighed. Next, these ceramic raw materials, PSZ balls and water are put into a ball mill and fully mixed by wet method. The mixed raw material was calcined at a temperature of 900° C. for about 4 hours in an air atmosphere to produce a calcined product. Next, 2.5% by weight of an organic binder was added to the calcined product, wet pulverized by a ball mill for about 16 hours, and dried. Then, use a 40-mesh sieve to granulate the dried roasted product at 8.6×10 7 The obtained powder was press-molded under a pressure of Pa to form a plate-shaped compact having a length of 25 mm, a width of 40 mm, and a thickness of 1.2 mm.

[0095] Next, the above-mentioned plate-shaped molded body was accommodated in a sagger made of alumina, and after performin...

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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.

Description

technical field [0001] The present invention relates to a pyroelectric ceramic composition, a pyroelectric element formed from the pyroelectric ceramic composition, and an infrared detector having the pyroelectric element. Background technique [0002] When the temperature of the pyroelectric ceramic composition changes due to absorption of infrared radiation energy, charges are formed on the surface due to a change in spontaneous polarization. Taking advantage of this phenomenon, pyroelectric ceramic compositions are widely used in infrared detectors as pyroelectric elements of pyroelectric elements. [0003] Such a pyroelectric ceramic composition is required to have a change in spontaneous polarization in response to a temperature change of the pyroelectric body, that is, a large pyroelectric characteristic. When the relative permittivity of the pyroelectric body is too small, it is easily affected by the parasitic capacitance of the external circuit of the infrared dete...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/472H01B3/12G01J1/02H01L37/02
CPCC04B2235/81C04B2235/3251C04B2235/768C04B2235/85C04B2235/3279C04B35/472G01J5/34C04B2235/3262H01L37/025C04B2235/79C04B2235/3208H10N15/15
Inventor 石井秀树堀川胜弘林浩仁
Owner MURATA MFG CO LTD
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