Journal of the Ceramic Society of Japan, Supplement
Online ISSN : 1349-2756
ISSN-L : 1349-2756
Journal of the Ceramic Society of Japan, Supplement 112-1, PacRim5 Special Issue
Session ID : 8
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Review
Hot Spot in LnBa2Cu3O7-δ Ceramics and Its Applications
Tomoichiro OKAMOTOYasuhiro IBARAKIMasasuke TAKATA
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CONFERENCE PROCEEDINGS FREE ACCESS

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Abstract
A hot spot, which is a local area glowing orange, appears in a LnBa2Cu3O7-δ (Ln: rare earth element) ceramic rod when a voltage exceeding a certain value is applied to the rod at room temperature. The rod with the hot spot shows various functional characteristics that give rise to applications in devices such as a constant-current generator, an oxygen sensor, a flowmeter and a low-frequency oscillator. In this paper, general features of the hot spot and various applications are reviewed. The hot spot is considered to appear in ceramics with a positive temperature coefficient of resistivity. New application fields may be created from the related researches.
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© 2004 The Ceramic Society of Japan
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