Effect of attrition milling on the piezoelectric properties of Bi0.5Na0.5TiO3-based ceramics
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Bismith sodium titanate (BNT)-based powders were prepared by conventionally mixed-oxide method using Bi2O3, Na2CO3 and TiO2. The La2O3 was added as the modifier to the BNT composition for easily poling and reducing an abnormal dielectric loss at high temperatures. In this study, the investigated compositions were Bi0.5Na0.5TiO3 and Bi0.5Na0.485La0.005TiO3. The powders were calcined at 900 °C for 2 h by slow heating rate at 100 °C/h. The calcined BNT-based powders were then attrition-milled for 3 h with a high speed at 350 rpm. After drying, the fine powders were uniaxially pressed and then cold-isostatically pressed (CIP) at 240 MPa for 10 min. All pressed pellets were sintered at 1000–1100 °C for 2 h in air atmosphere. The microstructure of sintered pellets was investigated by SEM. Results of dielectric and piezoelectric property measurement were also reported.
KeywordsLead-free piezoelectric Bismuth sodium titanate Attrition milling Perovskite
This project is granted by National Metal and Materials Technology Center (MTEC), Thailand under the in-house project grant No. MT-B-47-CER-07-160-I. The authors would like to express gratitude to Powder Characterization Laboratory, SEM Laboratory and XRD/XRF Laboratory for their technical supports.
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