Dielectric and ferroelectric properties of Pb(Fe_1/2 Nb_1/2)O₃ modification on Pb(Zr_0.52Ti_0.48)O₃ ceramics

ABSTRACT

Lead-based relaxor ferroelectric materials surged a favorable interest owing to their remarkable dielectric properties. Ferroelectric materials are sensitive to temperature changes. Dielectric properties are known to decrease when the temperature is higher than the temperature of the maximum dielectric constant. The objective of this research is to study the phase transition which was investigated by XRD, microstructure by SEM, the chemical bonds of samples identified by FTIR and the temperature dependent dielectric constants and loss tangents investigated as functions of temperature and frequency of (1 – x)Pb(Zr_0.52Ti_0.48)O₃-xPb(Fe_1/2 Nb_1/2)O₃ when x = 0, 10, and 30 mol%. A phase transition from morphotropic phase boundary (MPB) to tetragonal phase was observed. Grain size increased with increasing PFN was in the range of 0.99 to 3.61 µm. The shoulder of 0.7PZT52/48-0.3 PFN tend to disappear, the maximum absorbance around 419 cm^–1 in FTIR according to the harmonic oscillator. The dielectric dispersion increased slightly as well as the dielectric maximum temperature decreased while dielectric constant at room temperature increased when added-PFN into PZT52/48 indicating ferroelectric nature. Meanwhile, the d₃₃ and k_p initially increase for x = 0 to 0.1 then decrease with the increase of the PFN contents for x = 0.3 due to amount of exceeded Fe³⁺/Nb⁵⁺ ion.

KEYWORDS:

• Morphotropic phase boundary
• dielectric properties
• ferroelectric
• piezoelectric

Acknowledgments

This work was partly supported by grants from National Research Council of Thailand. The authors wish to acknowledge program of Chemistry, Faculty of Science and Technology, Sakon Nakhon Rajabhat University for Fourier transform infrared spectra to analyzing.

Additional information

Funding

National Research Council of Thailand.