Broadband dielectric spectroscopy of calcium modified BaZrTiO3 relaxor ceramics

Paulius Jankauskas; Agnieszka Wilk; Kamil Feliksik; Lucjan Kozielski; Jūras Banys; Šarūnas Svirskas

doi:10.3952/physics.2026.66.3.2

Paulius Jankauskas
Agnieszka Wilk
Kamil Feliksik
Lucjan Kozielski
Jūras Banys
Šarūnas Svirskas

DOI: https://doi.org/10.3952/physics.2026.66.3.2

Keywords: relaxors, broadband dielectric spectroscopy, perovskites

Abstract

In this work, we present the broadband dielectric spectroscopy results of Ca-modified BaZr_xTi_1–xO₃ (x = 0.5; 0.6). The goal of the work is to understand if the relaxor ferroelectric properties of BZT are affected by the calcium substitution at the A-site of the perovskite lattice. The tolerance factor of calcium ions is below 1 so they are supposed to introduce a larger lattice distortion.
Thus, we carefully investigate two BZT (BZT50 and BZT40) compositions with 10% of calcium. To assess the influence of the substitution, we analyze the dielectric spectra and Vogel–Fulcher behaviour of mean relaxation time. This data is compared with the data of parental compositions that are available in the literature.