材料科学
电介质
复合数
陶瓷
复合材料
陶瓷复合材料
工程物理
光电子学
工程类
作者
Dandan Yang,Yan Wang,Xihu Wang,Cheng Chen,Lijie Li,Minggang Yao,Lei Miao,Rong Ma,Hualei Cheng,Dengwei Hu
标识
DOI:10.1016/j.ceramint.2022.10.288
摘要
NaNbO 3 (NN) crystals with preferential growth of the [101] crystal axis were prepared by the molten salt method. Based on use of the prepared [101]-oriented NN powder as the raw material, BT/NN composite ceramics were prepared by the conventional solid-state reaction method. The effects of the amount of NN and sintering temperature on the microstructure and dielectric properties of the BT/NN composite ceramics were systematically studied. The optimal component ratio for the preparation of composite ceramics was explored by adjusting the contents of BT and NN. When BT: NN is 5 : 5, the dielectric constant of the BT/NN composite is 1112, which is higher than the dielectric constant of the single-component BT of 658 and NN of 550. Simultaneously, the phase transition temperature of composite ceramics is approximately 416 °C, which is significantly higher than the phase transition temperature of pure NN of 338 °C, further improving the phase stability of the NN structure. The preparation of BT/NN composite ceramics provides important guidance for the design of the ferroelectric-antiferroelectric composites and improvement of lead-free piezoelectric ceramics. • NaNbO 3 crystals with [101] crystal axis were prepared by the molten salt method. • BT/NN ceramics were prepared by solid-state reaction method from NaNbO 3 crystals. • BT/NN composite ceramics further improving the phase stability of the NN structure. • The dielectric properties of BT/NN composite ceramics were systematically studied.
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