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Multisite doped positive temperature coefficient (PTC) thermosensitive ceramic and preparation method thereof
The invention discloses a preparation method of a multisite doped positive temperature coefficient (PTC) thermosensitive ceramic, belonging to the technical field of ceramic materials. The preparation method has the advantages that compared with single doping or double doping, doping at sites A, B and O at the same time has the advantages that bigger distortion happens to a lattice structure and a ferroelectric tetragonal phase below a Curie temperature generates high spontaneous polarization intensity Ps; a grain boundary barrier under the Curie temperature is reduced or disappears as the higher spontaneous polarization space variation rate partially or wholly offsets the space charge effects, so that the resistivity at room temperature is further reduced; therefore, a PTC thermistor (PTCR) with ultralow resistivity at room temperature can be prepared and the resistivity at room temperature of the PTC ceramic material is reduced below 2 omega.cm; on the other hand, the ceramic material mixed quite uniformly can be prepared and the aim of uniform doping can be achieved by proportionally and uniformly mixing all the components in a solution form at the atomic/molecular level, so that the material repeatability is good and the product is uniform while the resistivity of the material is reduced.
Multisite doped positive temperature coefficient (PTC) thermosensitive ceramic and preparation method thereof
The invention discloses a preparation method of a multisite doped positive temperature coefficient (PTC) thermosensitive ceramic, belonging to the technical field of ceramic materials. The preparation method has the advantages that compared with single doping or double doping, doping at sites A, B and O at the same time has the advantages that bigger distortion happens to a lattice structure and a ferroelectric tetragonal phase below a Curie temperature generates high spontaneous polarization intensity Ps; a grain boundary barrier under the Curie temperature is reduced or disappears as the higher spontaneous polarization space variation rate partially or wholly offsets the space charge effects, so that the resistivity at room temperature is further reduced; therefore, a PTC thermistor (PTCR) with ultralow resistivity at room temperature can be prepared and the resistivity at room temperature of the PTC ceramic material is reduced below 2 omega.cm; on the other hand, the ceramic material mixed quite uniformly can be prepared and the aim of uniform doping can be achieved by proportionally and uniformly mixing all the components in a solution form at the atomic/molecular level, so that the material repeatability is good and the product is uniform while the resistivity of the material is reduced.
Multisite doped positive temperature coefficient (PTC) thermosensitive ceramic and preparation method thereof
FU QIUYUN (author) / ZHENG ZHIPING (author) / ZHOU DONGXIANG (author) / HU YUNXIANG (author) / LUO WEI (author)
2016-02-10
Patent
Electronic Resource
English
IPC:
C04B
Kalk
,
LIME
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