Barium titanate-based semiconductor ceramics, barium titanate-based semiconductor ceramic composition, and positive characteristic thermistor for temperature detection
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A semiconductor and barium titanate technology, which is applied in the field of barium titanate semiconductor ceramics, can solve the problems of low temperature detection, high resistance at room temperature, and low resistance at room temperature, and achieve small room temperature resistance, low detection temperature, The effect of high detection accuracy
Active Publication Date: 2020-03-03
MURATA MFG CO LTD
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[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
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[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 fabricated.
[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 o...
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Abstract
Provided is a positive temperature coefficient thermistor for temperature detection, which has a low room-temperature resistance, a low detection temperature, and a high degree of detection accuracy. For a semiconductor ceramic 1, a barium titanate semiconductor ceramic is used which contains, as its main constituent, a perovskite-type compound containing Ba, Ca, Sr, and Ti, and further contains R (R represents at least one selected from Y, La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, and Lu), Mn, and Si, where when the barium titanate semiconductor ceramic is dissolved, the Ca content x in parts by mol, the Sr content y in parts by mol, and the Mn content z in parts by mol in a case of Ti regarded as 100 parts by mol respectively meet 20 ‰¤ x ‰¤ 25, 19 ‰¤ y ‰¤ 25, and 0.01 ‰¤ z ‰¤ 0.03, and meet y ‰¥ -0.8x + 37 in a case of 0.01 ‰¤ z < 0.019, and y ‰¤ -x+48 in a case of 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 (...
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