(Bi1/2Na1/2)TiO3–Ba(Cu1/2W1/2)O3 Lead-Free Piezoelectric Ceramics |
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Authors: | Xiaoxing Wang Helen Lai-Wa Chan Chung-Loong Choy |
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Affiliation: | Department of Applied Physics and Materials Research Center, The Hong Kong Polytechnic University, Hunghom Kowloon, Hong Kong, China |
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Abstract: | (Bi1/2Na1/2)TiO3 with 0–6 mol% Ba(Cu1/2W1/2)O3 (BNT-BCW), a new member of the BNT-based group, has been prepared following the conventional mixed oxide route. The compacted bodies were sintered at 1130°C for 2 h to get dense ceramics. The addition of BCW into BNT ceramics facilitated the poling process because of a reduction in leakage current. 0.995BNT·0.005BCW ceramics exhibit a relatively high piezoelectric constant ( d 33= 80 × 10?12 C/N) and a relatively low dielectric loss (tan δ= 1.5%). Increased amount of BCW was found to increase the dielectric constant and loss of BNT-BCW ceramics and to suppress the grain growth. During sintering, some BCW diffuses into the lattice of BNT to form a solid solution and some remains on the grain boundaries. |
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Keywords: | bismuth titanates barium oxide piezoelectric materials/properties |
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