Lead-free compound ferroelectric ceramic composed of potassium-bismuth titanate and zinc oxide and preparation thereof
A technology of ferroelectric ceramics and composite ceramics, applied in the field of ferroelectric ceramics, can solve problems such as limiting the application range and temperature stability of KBT-based systems, and achieve the effects of improving various properties and inhibiting phase transitions
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Embodiment 1
[0023] Recipe: 0.8K 0.5 Bi 0.5 TiO 3 :0.2ZnO
[0024] K 0.5 Bi 0.5 TiO 3 Preparation of powders for analytically pure K 2 CO 3 (99.99%), Na 2 CO 3 (99.99%) and Bi 2 o 3 (99.99%) as raw material, according to K 0.5 Bi 0.5 TiO 3 Weigh the raw materials according to the elemental ratio, ball mill them in absolute ethanol for 12 hours, dry them, calcinate them at 800°C for 2 hours, ball mill them again for 12 hours, and dry them to obtain the pure perovskite phase structure K 0.5 Bi 0.5 TiO 3 Powder. To improve K 0.5 Bi 0.5 TiO 3 phase stability, the K obtained by calcination 0.5 Bi 0.5 TiO 3 The powder was pre-sintered at 980°C for 2 hours, ball milled for 12 hours, and dried for K 0.5 Bi 0.5 TiO 3 : Preparation of ZnO composite ceramics.
[0025] 0.8K 0.5 Bi 0.5 TiO 3 : Preparation of 0.2ZnO composite ceramic sample Weigh the K obtained by pre-sintering in molar ratio 0.5 Bi 0.5 TiO 3 Powder and ZnO nanopowder (particle size about 30nm), ball mill...
Embodiment 2
[0027] Recipe: 0.75K 0.5 Bi 0.5 TiO 3 :0.25ZnO
[0028] K 0.5 Bi 0.5 TiO 3 The powder calcining temperature is 840°C, hold for 4 hours, the pre-calcination temperature is 1010°C, hold for 3 hours, K 0.5 Bi 0.5 TiO 3 : The sintering temperature of ZnO multiphase ceramics is 1030°C, and the temperature is kept for 2h. Others are with embodiment 1.
Embodiment 3
[0030] Recipe: 0.75K 0.5 Bi 0.5 TiO 3 :0.25ZnO
[0031] K 0.5 Bi 0.5 TiO 3 The powder calcining temperature is 820°C, hold for 3 hours, the pre-calcination temperature is 1000°C, hold for 2.5h, K 0.5 Bi 0.5 TiO 3 : The sintering temperature of ZnO multiphase ceramics is 1020°C, and the temperature is kept for 2.5h. Others are with embodiment 1.
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