| Autor: |
Bao GC; Department of Electrical and Electronic Engineering, The Hong Kong Polytechnic University, Hong Kong, China., Shi DL; Department of Electrical and Electronic Engineering, The Hong Kong Polytechnic University, Hong Kong, China., Zhang JM; Department of Applied Physics, The Hong Kong Polytechnic University, Hong Kong, China., Yang F; Department of Electrical and Electronic Engineering, The Hong Kong Polytechnic University, Hong Kong, China., Yang G; School of Petrochemical Engineering, Changzhou University, Changzhou 213164, China., Li K; School of Materials Science and Engineering, Changzhou University, Changzhou 213164, China., Fang BJ; School of Materials Science and Engineering, Changzhou University, Changzhou 213164, China., Lam KH; Department of Electrical and Electronic Engineering, The Hong Kong Polytechnic University, Hong Kong, China.; Centre for Medical and Industrial Ultrasonics, James Watt School of Engineering, University of Glasgow, Glasgow G12 8QQ, UK. |
| Abstrakt: |
The fabrication method plays a key role in the performance of lead magnesium niobate-lead titanate-based ceramics. (1 - w )[Pb(Mg 1/3 Nb 2/3 ) 0.67 Ti 0.33 O 3 ]- w [Pb 1-1.5 x Sm x (Mg 1/3 Nb 2/3 ) y Ti 1- y O 3 ] piezoelectric ceramics were prepared by sintering the mixture of two different crystalline phases in which two pre-sintered precursor powders were mixed and co-fired at designated ratios ( w = 0.3, 0.4, 0.5, 0.6). The X-ray diffraction results show that all the ceramics presented a pure perovskite structure. The grains were closely packed and the average size was ~5.18 μm based on observations from scanning electron microscopy images, making the ceramics have a high density that is 97.8% of the theoretical one. The piezoelectric, dielectric, and ferroelectric properties of the ceramics were investigated systematically. It was found that the properties of the ceramics were significantly enhanced when compared to the ceramics fabricated using the conventional one-step approach. An outstanding piezoelectric coefficient d 33 of 1103 pC/N and relative dielectric permittivity ε 33 / ε 0 of 9154 was achieved for the ceramics with w = 0.5. |
