Effect of B-site dopants Nb, Ta and W on microstructure and electrical properties of Ca0.85(Li, Ce)0.075Bi4Ti4O15-0.01MnCO3 piezoelectric ceramics
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(Li, Ce) and Mn modified CaBi4Ti4O15 (CBT) based ceramics were prepared by the solid state route, and were substituted by the equimolar ions of Nb5+, Ta5+ and W6+ in the B-site. The variations of crystalline structure, microstructure, piezoelectric properties and dielectric properties were investigated. The XRD patterns indicated that all compositions formed a single bismuth layered-structural phase with m = 4. The additions of Nb2O5, Ta2O5 and WO3 into CBT-based ceramics were found to affect the electrical properties and temperature stability of the ceramics. Compared with Ta2O5 and WO3, the Nb-substitued ceramics exhibited the optimum piezoelectric property and dielectric property (d 33 ~ 19.6 pC/N, ε r ~ 123.7 and tanδ ~ 0.1 %) among all of these samples, together with a high Curie-temperature (T C ~ 767.6 °C). Thermally activated depolarization behavior also demonstrated that the Nb5+ doped CBT-based ceramics possess outstanding thermal stability of piezoelectric properties. These results indicated that Nb2O5 has a substantial effect on the structure and properties of CBT-based ceramics compared to Ta2O5 and WO3.
KeywordsDielectric Property Dielectric Loss Nb2O5 Piezoelectric Property Piezoelectric Coefficient
This work was supported by the National Natural Science Foundation of China (NSFC Nos. 61201064 and 51332003).
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