DOI: 10.18150/y97mia
title: Critical Insight into Pretransitional Behavior and Dielectric Tunability of Relaxor Ceramics

description: The results of experimental studies of Ba0.65Sr0.35TiO3 relaxor ceramics focused on glassy dynamics, tunability, and critical-like behavior in near paraelectric-ferroelectric phase transition region. The assessment of the sample properties included analysis of such parameters as the real part of dielectric permittivity and its reciprocal, the imaginary part of dielectric permittivity, loss tangent, relaxation times, and the maxima of loss curves. The sensitivity of the dielectric properties, in particular the dielectric constant, to the external electric field was also tested.The dataset contains the results of:the average particle size measurements (carried out using a Laser Scattering Particle Size Distribution Analyzer LA-950, HORIBA) of synthesized Ba0.65Sr0.35TiO3 powder;microstructure analysis of the sintered Ba0.65Sr0.35TiO3 sample performed with scanning electron microscope Prisma E (Thermo Scientific);broadband dielectric spectroscopy (BDS) measurements (carried out using Novocontrol Alpha-A analyzer) of the sintered Ba0.65Sr0.35TiO3 sample; data collected on cooling from 373 K to 123 K (251 temperature points) in the frequency range from 1 Hz to 10 MHz.The names of the individual files correspond to the numbering of the figures in the paper: Rzoska, S. J., Drozd-Rzoska, A., Bulejak, W., Łoś, J., Starzonek, S., Szafran, M., & Gao, F. (2023). Critical insight into pretransitional behavior and dielectric tunability of relaxor ceramics. Materials, 16(24), 7634.Files included in this collection:A1 - BDS spectra - complex dielectric permittivity vs frequency. Complete dataset (all 251 temperature points) measured in sintered Ba0.65Sr0.35TiO3 sample.A2 – BDS spectra – loss tangent vs frequency. Complete dataset (all 251 temperature points) measured in sintered Ba0.65Sr0.35TiO3 sample.Fig01 - Results of particle size distribution analysis carried out in Ba0.65Sr0.35TiO3 powder. Intensity (%) vs diameter (μm).Fig02 - Scanning electron microscope picture of the sintered Ba0.65Sr0.35TiO3 sample.Fig03 - Dielectric spectra – complex dielectric permittivity vs frequency. Data collected at the following temperatures: 373 K, 353 K, 333 K, 313 K, 293 K, 273 K, 253 K, 233 K, 213 K, 193 K, 173 K, 153 K, 133 K, and 123 K for sintered Ba0.65Sr0.35TiO3 sample.Fig04 - Temperature evolutions of the real part of dielectric permittivity measured in sintered Ba0.65Sr0.35TiO3 sample. Data was collected at the following frequencies: 1 Hz, 10 Hz, 100 Hz, 1 kHz, 10 kHz, 100 kHz, and 1 MHz.Fig05 - Temperature changes in the real part of dielectric permittivity, related to the so-called dielectric constant (ε'(T, f=10 kHz)) and its reciprocal (1/ε'(T, f=10 kHz)) measured in sintered Ba0.65Sr0.35TiO3 sample.Fig06 - The dielectric constant reciprocal derivative versus temperature, data collected for Ba0.65Sr0.35TiO3 ceramics sample.Fig07 - Temperature changes in the logarithm of the dielectric constant and the reciprocal of its derivative (data collected for Ba0.65Sr0.35TiO3 ceramics sample).Fig08 - Temperature changes in the derivative of dielectric constant (𝜀′(𝑓=10 kHz) ) logarithm (dln𝜀′/dT) in the surrounding of the paraelectric–ferroelectric transition (from 270 to 330 K), data collected for Ba0.65Sr0.35TiO3 ceramics sample.Fig09 - The imaginary part of dielectric permittivity (𝜀″(𝑓=10 kHz)) vs temperature and related loss tangent (𝑡𝑔δ ″(𝑓=10 kHz)) vs temperature collected for Ba0.65Sr0.35TiO3 ceramics sample.Fig10 - Temperature evolutions of loss tangent at selected frequencies (1 HZ, 10 HZ, 100 Hz, 1 kHz, 10 kHz, 100 kHz, 1 MHz) measured in Ba0.65Sr0.35TiO3 ceramics sample.Fig11 - Dielectric loss curves (𝜀'' vs frequency) at three selected temperatures (330K, 300K, 280 K) measured in Ba0.65Sr0.35TiO3 ceramics sample.Fig12 - Relaxation time vs reciprocal temperature (230 K - 370 K), data determined from loss curves measured in Ba0.65Sr0.35TiO3 ceramics sample.Fig12_inset - Relaxation time vs reciprocal temperature (120 K - 150 K), data determined from loss curves measured in Ba0.65Sr0.35TiO3 ceramics sample.Fig13 - The temperature dependence of the reciprocal of the apparent activation enthalpy measured in Ba0.65Sr0.35TiO3 ceramics sample.Fig14 - Temperature changes of the maxima of loss curves measured in Ba0.65Sr0.35TiO3 ceramics sample.Fig15 - Normalized dielectric loss versus normalized frequency, data determined from loss curves measured in Ba0.65Sr0.35TiO3 ceramics sample.Fig16 - Dielectric constant vs temperature measured when the following values of voltage were applied: 0, 200, 400, 600, 800, 1000, 1200 V to Ba0.65Sr0.35TiO3 ceramics sample.Fig17 - Relative changes in the dielectric constant (∆ε (E)=ε(E)-ε(0)) vs temperature. Scans collected under electric field 𝐸≠0 = are compared to the one collected at 𝐸=0. Data measured for Ba0.65Sr0.35TiO3 ceramics sample.Fig18 - Relative changes in the dielectric constant (∆ε (E)=ε(E)-ε(0)) versus the square of the applied voltage. Data measured for Ba0.65Sr0.35TiO3 ceramics sample.