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BT-BKT lead-free PTCR ceramic material with high curie temperature and preparation and application of BT-BKT lead-free PTCR ceramic material
The invention discloses a BT-BKT lead-free PTCR ceramic material with a high curie temperature. The material is prepared from barium titanate, potassium-bismuth titanate, manganous nitrate, aluminum nitrate, silicon dioxide and lanthanum nitrate; the chemical formula of the material is (1-x)BaTiO3-x(Bi0.5K0.5)TiO3, wherein x is smaller than 0.05 and greater than or equal to 0; and each 1mol of (1-x)BaTiO3-x(Bi0.5K0.5)TiO3 is doped with 0.00034-0.00038mol of manganous nitrate, 0.0015-0.0025mol of aluminum nitrate, 0.0075-0.0085mol of silicon dioxide and 0.001-0.0015mol of lanthanum nitrate. The BT-BKT lead-free PTCR ceramic material is prepared by adopting a sol-gel method; when the content of BKT (potassium-bismuth titanate) is 4mol%, the ceramic material still has good PTC property when being sintered in air, and the curie temperature is obviously improved; according to a thermistor prepared from the material, the room-temperature electrical resistivity is 25-1.1*10<4>ohm.cm, the curie temperature is 114-143 DEG C, and the lift-drag ratio is 3.07-3.76.
BT-BKT lead-free PTCR ceramic material with high curie temperature and preparation and application of BT-BKT lead-free PTCR ceramic material
The invention discloses a BT-BKT lead-free PTCR ceramic material with a high curie temperature. The material is prepared from barium titanate, potassium-bismuth titanate, manganous nitrate, aluminum nitrate, silicon dioxide and lanthanum nitrate; the chemical formula of the material is (1-x)BaTiO3-x(Bi0.5K0.5)TiO3, wherein x is smaller than 0.05 and greater than or equal to 0; and each 1mol of (1-x)BaTiO3-x(Bi0.5K0.5)TiO3 is doped with 0.00034-0.00038mol of manganous nitrate, 0.0015-0.0025mol of aluminum nitrate, 0.0075-0.0085mol of silicon dioxide and 0.001-0.0015mol of lanthanum nitrate. The BT-BKT lead-free PTCR ceramic material is prepared by adopting a sol-gel method; when the content of BKT (potassium-bismuth titanate) is 4mol%, the ceramic material still has good PTC property when being sintered in air, and the curie temperature is obviously improved; according to a thermistor prepared from the material, the room-temperature electrical resistivity is 25-1.1*10<4>ohm.cm, the curie temperature is 114-143 DEG C, and the lift-drag ratio is 3.07-3.76.
BT-BKT lead-free PTCR ceramic material with high curie temperature and preparation and application of BT-BKT lead-free PTCR ceramic material
YANG DEAN (Autor:in) / ZHANG CHI (Autor:in) / LU LIXIA (Autor:in) / DING CHUNHUI (Autor:in) / ZHAI TONG (Autor:in)
08.04.2015
Patent
Elektronische Ressource
Englisch
IPC:
C04B
Kalk
,
LIME
Preparation of Bi-Based High Curie Temperature PTCR Ceramic
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