Dielectric and piezoelectric properties of (Pb_0.985-xBi_2x/3La_0.01)(Nb_0.95Ti_0.0625)₂O₆ ceramics

ABSTRACT

(Pb_0.985-xBi_2x/3La_0.01)(Nb_0.95Ti_0.0625)₂O₆ with 2 wt% excess PbO (x = 0, 0.01, 0.04, 0.06, 0.1) piezoelectric ceramics with high Curie temperature were fabricated via a conventional solid-state reaction method. Dielectric and piezoelectric properties of the ceramics were studied. The Curie temperatures of the ceramics decrease with the increase in the Bi³⁺ amount. The values of dielectric constant remain nearly unchanged from room temperature up to about 400 °C for the ceramics with x = 0, 0.01, 0.04 and 0.06. The ceramic with x = 0.04 possesses high piezoelectric charge constant (87 pC/N), low mechanical quality factor (22.60), low dielectric loss (0.024), and high Curie temperature (494 °C).

KEYWORDS:

• Piezoelectric ceramic
• X-ray diffraction
• dielectric properties
• piezoelectric properties

Funding

This work was supported by the National Natural Science Foundation of China (No. 51372147), Shaanxi Province Science and Technology Foundation (No. 2012KJXX-30), Fundamental Research Funds for the Central Universities (No. GK201502005, GK201401003).