Dielectric properties of (Eu,Ca)Cu3Ti4O12 ceramics prepared by a sol-gel method

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60461373%3A22310%2F23%3A43927042" target="_blank" >RIV/60461373:22310/23:43927042 - isvavai.cz</a>

Výsledek na webu

<a href="https://www.sciencedirect.com/science/article/pii/S0022369723001245?via%3Dihub" target="_blank" >https://www.sciencedirect.com/science/article/pii/S0022369723001245?via%3Dihub</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.jpcs.2023.111334" target="_blank" >10.1016/j.jpcs.2023.111334</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Dielectric properties of (Eu,Ca)Cu3Ti4O12 ceramics prepared by a sol-gel method

Popis výsledku v původním jazyce

CaCu3Ti4O12 perovskite-type phase possesses promising dielectric properties; however, the giant permittivity phenomenon in this material has not been satisfactorily described yet. Eu with similar electronegativity and ionic radius as Ca was selected for testing of partly and completely substituted materials. Here, we prepared a series with a composition of CaCu3Ti4O12, Eu0.4Ca0.6Cu3Ti4O12 and EuCu3Ti4O12. A sol-gel method was used to synthetize precursors, followed by sintering in a temperature range of 1000 °C-1120 °C. Europium was substituted in full stoichiometry of CaII with the aim to observe whether i) EuII is stabilized in the perovskite structure and/or ii) possible secondary phases induced by the excess of EuIII positively affect the dielectric characteristics. Samples were characterized by XPS, XRD, SEM. Influence of the microstructure and phase composition on the dielectric properties of the samples (also in relation to the sintering temperature) is discussed. Secondary phases and microstructure played an important role in improving the permittivity values. The obtained values of permittivity measured at room temperature are giant up to higher frequencies, but differ significantly for some individual compositions.

Název v anglickém jazyce

Dielectric properties of (Eu,Ca)Cu3Ti4O12 ceramics prepared by a sol-gel method

Popis výsledku anglicky

CaCu3Ti4O12 perovskite-type phase possesses promising dielectric properties; however, the giant permittivity phenomenon in this material has not been satisfactorily described yet. Eu with similar electronegativity and ionic radius as Ca was selected for testing of partly and completely substituted materials. Here, we prepared a series with a composition of CaCu3Ti4O12, Eu0.4Ca0.6Cu3Ti4O12 and EuCu3Ti4O12. A sol-gel method was used to synthetize precursors, followed by sintering in a temperature range of 1000 °C-1120 °C. Europium was substituted in full stoichiometry of CaII with the aim to observe whether i) EuII is stabilized in the perovskite structure and/or ii) possible secondary phases induced by the excess of EuIII positively affect the dielectric characteristics. Samples were characterized by XPS, XRD, SEM. Influence of the microstructure and phase composition on the dielectric properties of the samples (also in relation to the sintering temperature) is discussed. Secondary phases and microstructure played an important role in improving the permittivity values. The obtained values of permittivity measured at room temperature are giant up to higher frequencies, but differ significantly for some individual compositions.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10402 - Inorganic and nuclear chemistry

Projekt

<a href="/cs/project/GA20-03253S" target="_blank" >GA20-03253S: Fázové rovnováhy, proměnlivá stechiometrie a fyzikální vlastnosti oxidů přechodných kovů</a><br>

Návaznosti

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

Rok uplatnění

2023

Kód důvěrnosti údajů

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

Název periodika

Journal of Physics and Chemistry of Solids

ISSN

0022-3697

e-ISSN

—

Svazek periodika

178

Číslo periodika v rámci svazku

July 2023

Stát vydavatele periodika

NL - Nizozemsko

Počet stran výsledku

8

Strana od-do

111334

Kód UT WoS článku

000959941100001

EID výsledku v databázi Scopus

2-s2.0-85150795691