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Bismuth layer-structured ferroelectric ceramics of Na0.5Bi4.5-x(Nd0.5Ce0.5)xTi4O15 (NBT-x, 0.0 ≤ x ≤ 0.4) were synthesized by a traditional solid-state reaction. The effect of (Nd,Ce) substitution for A-site on the microstructure and electrical properties of Na0.5Bi4.5Ti4O15 (NBT)-based piezoelectric ceramics was investigated. X-ray diffraction (XRD) analysis revealed that the (Nd,Ce)-modified NBT ceramics have a pure four-layer Aurivillius type structure. The piezoelectric properties of NBT ceramics were significantly improved by the modification of neodymium and cerium. The Curie temperature TC gradually decreased from 638 ℃ to 618 ℃ with increasing the (Nd,Ce) modification. The piezoelectric constant d33, mechanical quality factor Qm, dielectric loss tanδ and Curie temperature TC of the Na0.5Bi4.3(Nd0.5Ce0.5)0.2Ti4O15 ceramic were found to be 28 pC/N, 3239, 0.0032 and 630 ℃, respectively. Thermal annealing studies indicated that the (Nd,Ce)-modified NBT ceramics possess stable piezoelectric properties, demonstrating that the Na0.5Bi4.3(Nd0.5Ce0.5)0.2Ti4O15 ceramic is a promising candidate for high temperature applications.
Bismuth layer-structured ferroelectric ceramics of Na0.5Bi4.5-x(Nd0.5Ce0.5)xTi4O15 (NBT-x, 0.0 ≤ x ≤ 0.4) were synthesized by a traditional solid-state reaction. The effect of (Nd,Ce) substitution for A-site on the microstructure and electrical properties of Na0.5Bi4.5Ti4O15 (NBT)-based piezoelectric ceramics was investigated. X-ray diffraction (XRD) analysis revealed that the (Nd,Ce)-modified NBT ceramics have a pure four-layer Aurivillius type structure. The piezoelectric properties of NBT ceramics were significantly improved by the modification of neodymium and cerium. The Curie temperature TC gradually decreased from 638 ℃ to 618 ℃ with increasing the (Nd,Ce) modification. The piezoelectric constant d33, mechanical quality factor Qm, dielectric loss tanδ and Curie temperature TC of the Na0.5Bi4.3(Nd0.5Ce0.5)0.2Ti4O15 ceramic were found to be 28 pC/N, 3239, 0.0032 and 630 ℃, respectively. Thermal annealing studies indicated that the (Nd,Ce)-modified NBT ceramics possess stable piezoelectric properties, demonstrating that the Na0.5Bi4.3(Nd0.5Ce0.5)0.2Ti4O15 ceramic is a promising candidate for high temperature applications.
This work was supported by the National Natural Science Foundation of China (No. 51262009), Natural Science Foundation of Jiangxi (Nos. 20132BAB202002, 20122BAB202001 and 20122BAB203019), Foundation of Training Academic and Technical Leaders for Main Majors of Jiangxi (No. 2010DD00800), Colleges and Universities “Advanced Ceramics” Scientific and Technological Innovation Team of Jiangxi, and Foundation of Jiangxi Provincial Department of Education (Nos. GJJ3629 and GJJ3630).
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