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Published in:
05-02-2019
Electrical and photoluminescence properties of (Bi0.5−x/0.94Erx/0.94Na0.5)0.94Ba0.06TiO3 lead-free ceramics
Published in: Journal of Materials Science: Materials in Electronics | Issue 5/2019
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Abstract
In this paper, electrical and photoluminescence properties of the (Bi0.5−x/0.94Erx/0.94Na0.5)0.94Ba0.06TiO3 lead-free ceramics with x ≤ 0.02 were investigated. All ceramics have pure perovskite phase. Lattice distortion induced by the doping of Er3+ was observed. The ceramics show average grain sizes around 0.6–1.0 µm. The doped ceramics exhibit decreased dielectric constant, which are still higher than 1200 at room temperature. Curie temperatures of the samples do not fluctuate dramatically with changing the doping amounts, which are around 250 °C. The piezoelectric constant d33 is closely related to the Er3+ content. Under an excitation of 487 nm, the ceramics exhibit visible luminescent emissions at 528 nm (green), 548 nm (green), and 670 nm (red).