PARTIALLY SINTERED LEAD-FREE CERAMICS FROM PIEZOELECTRIC POWDERS PREPARED VIA CONVENTIONAL FIRING AND SPARK PLASMA SINTERING (SPS) – – CHARACTERIZATION OF MICROSTRUCTURE AND DIELECTRIC PROPERTIES
Identifikátory výsledku
Kód výsledku v IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21230%2F21%3A00354666" target="_blank" >RIV/68407700:21230/21:00354666 - isvavai.cz</a>
Výsledek na webu
<a href="https://doi.org/10.13168/cs.2020.0039" target="_blank" >https://doi.org/10.13168/cs.2020.0039</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.13168/cs.2020.0039" target="_blank" >10.13168/cs.2020.0039</a>
Alternativní jazyky
Jazyk výsledku
angličtina
Název v původním jazyce
PARTIALLY SINTERED LEAD-FREE CERAMICS FROM PIEZOELECTRIC POWDERS PREPARED VIA CONVENTIONAL FIRING AND SPARK PLASMA SINTERING (SPS) – – CHARACTERIZATION OF MICROSTRUCTURE AND DIELECTRIC PROPERTIES
Popis výsledku v původním jazyce
This work deals with dielectric properties of lead-free ceramics from piezoelectric powders and focuses on the preparation and characterization of potassium-sodium niobate (K0.5Na0.5NbO3, KNN) and barium titanate (BaTiO3, BT) ceramics. Ceramic samples with different porosity were prepared from commercial KNN and BT powders by conventional firing in air or spark plasma sintering (SPS) at temperatures 600 - 1000 °C for KNN and 900 - 1300 °C for BT, resulting in partially or fully sintered microstructures. Bulk density, apparent density and open porosity were determined using the Archimedes method and closed and total porosities were calculated on the basis of theoretical densities. For both types of ceramics, the porosity decreases with increasing sintering temperature, and for identical temperatures the porosity of SPS samples is lower than for conventional firing, because the pressure applied during SPS promotes densification. For KNN the influence of SPS on the porosity is much larger than for BT. With increasing SPS temperature KNN exhibits a moderate decrease of the alkali content. The results of dielectric property measurements and their frequency dependence via impedance spectroscopy in the range from 10 or 100 Hz to 1 MHz show that the relative permittivity decreases in all cases with frequency and is usually higher for ceramics prepared via SPS than for conventional firing. This can be explained by the lower porosity and smaller grain size. The absolute values of the relative permittivity at 1 kHz are 134 - 532 (conventional firing) and 148 - 3780 (SPS) for KNN, and 753 - 1801 (conventional firing) and 923 - 10 380 (SPS) for BT ceramics.
Název v anglickém jazyce
PARTIALLY SINTERED LEAD-FREE CERAMICS FROM PIEZOELECTRIC POWDERS PREPARED VIA CONVENTIONAL FIRING AND SPARK PLASMA SINTERING (SPS) – – CHARACTERIZATION OF MICROSTRUCTURE AND DIELECTRIC PROPERTIES
Popis výsledku anglicky
This work deals with dielectric properties of lead-free ceramics from piezoelectric powders and focuses on the preparation and characterization of potassium-sodium niobate (K0.5Na0.5NbO3, KNN) and barium titanate (BaTiO3, BT) ceramics. Ceramic samples with different porosity were prepared from commercial KNN and BT powders by conventional firing in air or spark plasma sintering (SPS) at temperatures 600 - 1000 °C for KNN and 900 - 1300 °C for BT, resulting in partially or fully sintered microstructures. Bulk density, apparent density and open porosity were determined using the Archimedes method and closed and total porosities were calculated on the basis of theoretical densities. For both types of ceramics, the porosity decreases with increasing sintering temperature, and for identical temperatures the porosity of SPS samples is lower than for conventional firing, because the pressure applied during SPS promotes densification. For KNN the influence of SPS on the porosity is much larger than for BT. With increasing SPS temperature KNN exhibits a moderate decrease of the alkali content. The results of dielectric property measurements and their frequency dependence via impedance spectroscopy in the range from 10 or 100 Hz to 1 MHz show that the relative permittivity decreases in all cases with frequency and is usually higher for ceramics prepared via SPS than for conventional firing. This can be explained by the lower porosity and smaller grain size. The absolute values of the relative permittivity at 1 kHz are 134 - 532 (conventional firing) and 148 - 3780 (SPS) for KNN, and 753 - 1801 (conventional firing) and 923 - 10 380 (SPS) for BT ceramics.
Klasifikace
Druh
J<sub>imp</sub> - Článek v periodiku v databázi Web of Science
CEP obor
—
OECD FORD obor
20504 - Ceramics
Návaznosti výsledku
Projekt
—
Návaznosti
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
Ostatní
Rok uplatnění
2021
Kód důvěrnosti údajů
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Údaje specifické pro druh výsledku
Název periodika
Ceramics-Silikáty
ISSN
0862-5468
e-ISSN
1804-5847
Svazek periodika
65
Číslo periodika v rámci svazku
1
Stát vydavatele periodika
CZ - Česká republika
Počet stran výsledku
8
Strana od-do
30-37
Kód UT WoS článku
000646825800002
EID výsledku v databázi Scopus
2-s2.0-85111562690