Enhanced structural and electrical properties of furnace-cooled SrZrO3-modified BFBT lead-free piezoceramics for high-temperature applications

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61989100%3A27240%2F25%3A10259017" target="_blank" >RIV/61989100:27240/25:10259017 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/61989100:27730/25:10259017

Výsledek na webu

<a href="https://www.nature.com/articles/s41598-025-24037-0" target="_blank" >https://www.nature.com/articles/s41598-025-24037-0</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1038/s41598-025-24037-0" target="_blank" >10.1038/s41598-025-24037-0</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Enhanced structural and electrical properties of furnace-cooled SrZrO3-modified BFBT lead-free piezoceramics for high-temperature applications

Popis výsledku v původním jazyce

Lead-free SrZrO3 (SZ)-modified BiFeO3-BaTiO3 ceramics (BFBT-SZx, x = 0, 0.02, and 0.04 mol%) were synthesized via a conventional solid-state reaction route followed by furnace cooling. X-ray diffraction (XRD) confirmed a single-phase pseudocubic perovskite structure with no secondary phases, while energy-dispersive X-ray spectroscopy (EDS) verified the presence of all intended elements, including Sr and Zr. Field emission scanning electron microscopy (FESEM) revealed enhanced grain uniformity and densification, with average powder particle size decreasing from 1.68 mu m to 0.98 mu m. The bulk absolute density increased from 3.35 g/cm(3) (undoped) to 5.75 g/cm(3) (SZ-0.04), corresponding to a relative density increase from similar to 90% (undoped) to similar to 92.5% (SZ-0.02) and similar to 94% (SZ-0.04). Fourier transform infrared spectroscopy (FTIR) confirmed the formation of metal-oxygen bonds characteristic of the perovskite lattice. Dielectric measurements showed improved thermal stability and reduced loss upon doping. The dielectric constant (epsilon(r)) decreased with increasing SZ content from similar to 7200 (x = 0) to similar to 2550 (x = 0.04) at 1 MHz, while the temperature of the epsilon(r) peak shifted from similar to 350 degrees C (undoped) to &gt; 400 degrees C (4% SZ) at 1 kHz. Doped samples maintained epsilon(r) variation within +/- 5% over a broad 20-510 degrees C range, and the dielectric loss (tan delta) was significantly reduced with low dielectric loss values on the order of 10(-3) at 1 kHz, indicating diminished conduction losses. Increasing diffuseness parameter (gamma = 1.69-1.89) confirmed relaxor behavior and enhanced polar disorder. Impedance spectroscopy revealed grain and grain boundary contributions in doped samples, while AC conductivity analysis indicated improved charge transport with temperature. Activation energy calculations showed a decrease from similar to 0.80 eV (x = 0) to similar to 0.20 eV (x = 0.04), confirming improved transport charge. The novelty of this work lies in demonstrating that low-level SZ doping simultaneously stabilizes the perovskite lattice, suppresses conduction loss, tunes relaxor-type response, and improves high-temperature dielectric reliability. These unique features make BFBT-SZ ceramics strong candidates not only for high-temperature dielectric and piezoelectric devices, as well as energy-related applications, including high-energy-density capacitors, energy storage systems, and thermally stable energy conversion modules.

Název v anglickém jazyce

Enhanced structural and electrical properties of furnace-cooled SrZrO3-modified BFBT lead-free piezoceramics for high-temperature applications

Popis výsledku anglicky

Lead-free SrZrO3 (SZ)-modified BiFeO3-BaTiO3 ceramics (BFBT-SZx, x = 0, 0.02, and 0.04 mol%) were synthesized via a conventional solid-state reaction route followed by furnace cooling. X-ray diffraction (XRD) confirmed a single-phase pseudocubic perovskite structure with no secondary phases, while energy-dispersive X-ray spectroscopy (EDS) verified the presence of all intended elements, including Sr and Zr. Field emission scanning electron microscopy (FESEM) revealed enhanced grain uniformity and densification, with average powder particle size decreasing from 1.68 mu m to 0.98 mu m. The bulk absolute density increased from 3.35 g/cm(3) (undoped) to 5.75 g/cm(3) (SZ-0.04), corresponding to a relative density increase from similar to 90% (undoped) to similar to 92.5% (SZ-0.02) and similar to 94% (SZ-0.04). Fourier transform infrared spectroscopy (FTIR) confirmed the formation of metal-oxygen bonds characteristic of the perovskite lattice. Dielectric measurements showed improved thermal stability and reduced loss upon doping. The dielectric constant (epsilon(r)) decreased with increasing SZ content from similar to 7200 (x = 0) to similar to 2550 (x = 0.04) at 1 MHz, while the temperature of the epsilon(r) peak shifted from similar to 350 degrees C (undoped) to &gt; 400 degrees C (4% SZ) at 1 kHz. Doped samples maintained epsilon(r) variation within +/- 5% over a broad 20-510 degrees C range, and the dielectric loss (tan delta) was significantly reduced with low dielectric loss values on the order of 10(-3) at 1 kHz, indicating diminished conduction losses. Increasing diffuseness parameter (gamma = 1.69-1.89) confirmed relaxor behavior and enhanced polar disorder. Impedance spectroscopy revealed grain and grain boundary contributions in doped samples, while AC conductivity analysis indicated improved charge transport with temperature. Activation energy calculations showed a decrease from similar to 0.80 eV (x = 0) to similar to 0.20 eV (x = 0.04), confirming improved transport charge. The novelty of this work lies in demonstrating that low-level SZ doping simultaneously stabilizes the perovskite lattice, suppresses conduction loss, tunes relaxor-type response, and improves high-temperature dielectric reliability. These unique features make BFBT-SZ ceramics strong candidates not only for high-temperature dielectric and piezoelectric devices, as well as energy-related applications, including high-energy-density capacitors, energy storage systems, and thermally stable energy conversion modules.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10700 - Other natural sciences

Projekt

<a href="/cs/project/TN02000025" target="_blank" >TN02000025: Národní centrum pro energetiku II</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2025

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Scientific Reports

ISSN

2045-2322

e-ISSN

—

Svazek periodika

15

Číslo periodika v rámci svazku

1

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

18

Strana od-do

1-18

Kód UT WoS článku

001618234300032

EID výsledku v databázi Scopus

—