Invention Grant
- Patent Title: Semiconductor ceramic composition and PTC thermistor
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Application No.: US15222050Application Date: 2016-07-28
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Publication No.: US10014097B2Publication Date: 2018-07-03
- Inventor: Kazutaka Fujita , Kazuhiko Itoh , Yoshikazu Shimura
- Applicant: TDK CORPORATION
- Applicant Address: JP Tokyo
- Assignee: TDK CORPORATION
- Current Assignee: TDK CORPORATION
- Current Assignee Address: JP Tokyo
- Agency: Oliff PLC
- Priority: JP2015-153786 20150804
- Main IPC: H01C7/02
- IPC: H01C7/02 ; C04B35/468 ; C04B35/626 ; C04B35/64 ; H01C1/14

Abstract:
A semiconductor ceramic composition including a compound represented by the following general formula (1) as a main component. (BavBixAyREw)m(TiuTMz)O3 (1) (wherein, A represents both elements of Na and K; RE is at least one element selected from the group consisting of Y, La, Ce, Pr, Nd, Sm, Gd, Dy and Er; and TM is at least one element selected from the group consisting of V, Nb and Ta.) 0.01≤x≤0.15 (2) x≤y≤0.3 (3) 0≤(w+z)≤0.01 (4) v+x+y+w=1 (5) u+z=1 (6) 0.950≤m≤1.050 (7) further, 0.001 mol to 0.055 mol of Ca is included and the ratio of Na/(Na+K) is 0.1 or more and less than 1.
Public/Granted literature
- US20170040092A1 SEMICONDUCTOR CERAMIC COMPOSITION AND PTC THERMISTOR Public/Granted day:2017-02-09
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