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Barium titanate semiconductor ceramic, barium titanate semiconductor ceramic composition, and PTC thermistor for temperature detection

A ceramic composition and semiconductor technology, applied in the direction of resistors with positive temperature coefficients, etc., can solve the problems of low room temperature resistance, difficulty in taking into account the low temperature of detection temperature, and high resistance of room temperature resistance, etc., to achieve low detection temperature and room temperature resistance The effect of small size and high detection accuracy

Active Publication Date: 2017-08-01
MURATA MFG CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] However, although any method is helpful for lowering the detection temperature, there is room temperature resistance (ρ 25 ) has the disadvantage of high resistance, therefore, it is difficult to take into account the effect of lowering the detection temperature and keeping the room temperature resistance lower

Method used

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  • Barium titanate semiconductor ceramic, barium titanate semiconductor ceramic composition, and PTC thermistor for temperature detection
  • Barium titanate semiconductor ceramic, barium titanate semiconductor ceramic composition, and PTC thermistor for temperature detection
  • Barium titanate semiconductor ceramic, barium titanate semiconductor ceramic composition, and PTC thermistor for temperature detection

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Effect test

experiment example

[0073] In order to confirm the effectiveness of the present invention, the following experiments were performed.

[0074] (Experiment 1)

[0075] By the method of the above-mentioned embodiment, barium titanate-based semiconducting ceramics such as 102 having different compositions were fabricated. Then, using these semiconducting ceramics to fabricate as figure 1 The so-called bulk type positive characteristic thermistor shown is used as the sample of this experiment.

[0076] Specifically, using semiconductor ceramics such as 102 described in Tables 1 to 5, positive characteristic thermistors of samples were produced.

[0077] [Table 1]

[0078] Table 1

[0079] In the case of containing 0.005 mole parts of Mn

[0080]

[0081] (Sample numbers marked with ※ are outside the scope of the invention)

[0082] [Table 2]

[0083] Table 2

[0084] In the case of containing 0.01 mole parts of Mn

[0085]

[0086] (Sample numbers marked with ※ are outside the scope of ...

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Abstract

A PTC thermistor for temperature detection is provided which has low room-temperature resistance, a low detection temperature, and high detection accuracy. As the semiconductor ceramic (1), a barium titanate semiconductor ceramic is used which contains a Perovskite-type compound containing Ba, Ca, Sr and Ti as the main component, and which further contains R (R is at least one of Y, La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb and Lu), Mn and Si. Setting the amount of Ti to 100 parts by mole, the barium titanate semiconductor ceramic in a melted state has x parts by mole of Ca, y parts by mole of Sr and z parts by mole of Mn, with 20<=x<=25, 19<=y<=25, and 0.01<= z<=0.03, and further, y>=-0.8x+37 holds when 0.01<=z<0.019 and y<=-x+48 holds when 0.021<z<=0.03.

Description

technical field [0001] The invention relates to a barium titanate semiconductor ceramic, a barium titanate semiconductor ceramic composition and a positive characteristic thermistor for temperature detection. More specifically, the present invention relates to a positive characteristic thermistor for temperature detection having a small room temperature resistance, a low detection temperature, and high detection accuracy, and a barium titanate-based semiconductor suitable for manufacturing such a positive characteristic thermistor for temperature detection Ceramics, barium titanate semiconductor ceramic composition. Background technique [0002] In electronic devices such as laptop personal computers and tablet terminals, positive characteristic thermistors (PTC thermistors) are used as temperature detection elements to detect abnormal internal heat generation. [0003] The resistance value of the positive characteristic thermistor is almost constant from room temperature (...

Claims

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Application Information

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IPC IPC(8): C04B35/468H01C7/02
CPCC04B35/4682C04B2235/3208C04B2235/3213C04B2235/3224C04B2235/3225C04B2235/3227C04B2235/3229C04B2235/3262C04B2235/3418H01C7/02
Inventor 阿部直晃松永达也
Owner MURATA MFG CO LTD
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