摘要:
A semiconductive porcelain composition/electrode assembly which is low in room temperature resistivity of 100 Ω·cm or less and is reduced in change with the passage of time due to energization with regard to the semiconductive porcelain composition in which a part of Ba of BaTiO3 is substituted with Bi—Na and which has a P-type semiconductive component at a crystal grain boundary. Also, there is a process for producing a semiconductive porcelain composition/electrode assembly wherein an electrode is joined to a semiconductive porcelain composition in which a part of Ba of BaTiO3 is substituted with Bi—Na and which has a P-type semiconductive component at a crystal grain boundary, the process including joining the electrode to the semiconductive porcelain composition, followed by conducting a heat treatment at a temperature of from 100° C. to 600° C. for 0.5 hour to 24 hours.
摘要:
To improve jump characteristic of BaTiO3—(Bi1/2Na1/2)TiO3 material.There is provided a process for producing a semiconductive porcelain composition in which a part of Ba is substituted with Bi—Na, the process including a step of preparing a (BaQ)TiO3 calcined powder (in which Q is a semiconductor dopant), a step of preparing a (BiNa)TiO3 calcined powder, a step of mixing the (BaQ)TiO3 calcined powder and the (BiNa)TiO3 calcined powder, a step of molding and sintering the mixed calcined powder, and a step of heat-treating the obtained sintered body at 600° C. or lower; and a PCT heater employing the element prepared by the above steps.
摘要:
To improve jump characteristic of BaTiO3—(Bi1/2Na1/2)TiO3 material.There is provided a process for producing a semiconductive porcelain composition in which a part of Ba is substituted with Bi—Na, the process including a step of preparing a (BaQ)TiO3 calcined powder (in which Q is a semiconductor dopant), a step of preparing a (BiNa)TiO3 calcined powder, a step of mixing the (BaQ)TiO3 calcined powder and the (BiNa)TiO3 calcined powder, a step of molding and sintering the mixed calcined powder, and a step of heat-treating the obtained sintered body at 600° C. or lower; and a PCT heater employing the element prepared by the above steps.
摘要:
There is provided a semiconductor ceramic composition in which a portion of Ba of BaTiO3 is substituted by Bi—Na, which exhibits an excellent jump characteristic while reducing room temperature resistivity and which also reduces room temperature resistivity and exhibits small change with time.A semiconductor ceramic composition which is represented by a composition formula of [(Biθ—Naδ)x(Ba1-yRy)1-x]TiO3 (where R is at least one kind of rare earth elements), in which x, y, θ and δ satisfy 0
摘要:
An object is to provide a PTC element that can be made thinner, using a Pb-free semiconductor ceramic composition.The object is achieved with a PTC element including at least two metal electrodes and a BaTiO3 system semiconductor ceramic composition arranged between the electrodes, in which, in the semiconductor ceramic composition, a portion of Ba in the BaTiO3 system is substituted by Bi—Na and a semiconductorizing element, vacancies are formed on Bi sites by depleting at least a portion of Bi, and oxygen defects are formed on a crystal thereof. Since the PTCR characteristic at the inside of the semiconductor ceramic composition is negligibly weak in comparison with the PTCR characteristic at the interface between the semiconductor ceramic composition and the electrodes, the PTC element can be made thinner.
摘要:
A semiconductive porcelain composition/electrode assembly which is low in room temperature resistivity of 100 Ω·cm or less and is reduced in change with the passage of time due to energization with regard to the semiconductive porcelain composition in which a part of Ba of BaTiO3 is substituted with Bi—Na and which has a P-type semiconductive component at a crystal grain boundary. Also, there is a process for producing a semiconductive porcelain composition/electrode assembly wherein an electrode is joined to a semiconductive porcelain composition in which a part of Ba of BaTiO3 is substituted with Bi—Na and which has a P-type semiconductive component at a crystal grain boundary, the process including joining the electrode to the semiconductive porcelain composition, followed by conducting a heat treatment at a temperature of from 100° C. to 600° C. for 0.5 hour to 24 hours.
摘要:
An object is to provide a PTC element that can be made thinner, using a Pb-free semiconductor ceramic composition.The object is achieved with a PTC element including at least two metal electrodes and a BaTiO3 system semiconductor ceramic composition arranged between the electrodes, in which, in the semiconductor ceramic composition, a portion of Ba in the BaTiO3 system is substituted by Bi—Na and a semiconductorizing element, vacancies are formed on Bi sites by depleting at least a portion of Bi, and oxygen defects are formed on a crystal thereof. Since the PTCR characteristic at the inside of the semiconductor ceramic composition is negligibly weak in comparison with the PTCR characteristic at the interface between the semiconductor ceramic composition and the electrodes, the PTC element can be made thinner.