Properties of neodymium-doped Ca0.15Sr1.85Bi4Ti5O18 ferroelectric ceramics
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Bismuth-layered compound Ca0.15Sr1.85Bi4−xNdxTi5O18 (CSBNT, x = 0–0.25) ferroelectric ceramics samples were prepared by solid-state reaction method. The effects of Nd3+ doping on their ferroelectric and dielectric properties were investigated. The remnant polarization Pr of CSBNT ceramics increases at beginning then decreases with increasing of Nd3+ doping level, and a maximum Pr value of 9.6 μC/cm2 at x = 0.05 was detected with a coercive field Ec = 80.2 kV/cm. Nd3+ dopant not only decreases the Curie temperature linearly, but also the dielectric constant (εr) and dielectric loss tangent (tan δ). The magnitudes of εr and tan δ at the frequency of 100 kHz are estimated to be 164 and 0.0083 at room temperature, respectively.
KeywordsPerovskite Oxygen Vacancy Ceramic Sample Ferroelectric Property Structural Distortion
The work was jointly supported by National Natural Science Foundation of China (No.50872075). The authors are grateful to Y.S. Chai for helpful discussions.