Influence of interfacial stresses on electrical properties of bismuth manganite-lead titanate-epoxy composite

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F62690094%3A18470%2F21%3A50018979" target="_blank" >RIV/62690094:18470/21:50018979 - isvavai.cz</a>

Výsledek na webu

<a href="https://www.sciencedirect.com/science/article/pii/S0272884221027796?via%3Dihub" target="_blank" >https://www.sciencedirect.com/science/article/pii/S0272884221027796?via%3Dihub</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.ceramint.2021.08.376" target="_blank" >10.1016/j.ceramint.2021.08.376</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Influence of interfacial stresses on electrical properties of bismuth manganite-lead titanate-epoxy composite

Popis výsledku v původním jazyce

This work compares the dielectric properties of two new materials. One was 0.88 bismuth manganite-0.12 lead titanate (noted BM-PT hereafter) ceramics composite obtained by standard high-temperature sintering. The second composite was obtained from powdered ceramics dispersed in epoxy glue (noted BM-PT-epoxy). The occurrence of four phases in the ceramics, using X-ray powder diffraction (XRD), was recognized: orthorhombic Pbam, cubic Pn3m, cubic Pm3m, and monoclinic P2/m phase. Pseudo-Voigt function fitting confirmed significant structural disorder in the BiMn2O5 crystal lattice. Analysis of broadband dielectric spectroscopy data confirmed the applicability of the small polaron model to explain detected relaxation processes. Involvement of oxygen vacancies in relaxation and their correspondence to ordered, uniform potential wells in crystal lattices was deduced. Electric conductivity relaxation times behavior proved the sensitivity of the ceramics&apos; electrical features to hydrostatic pressure. BM-PT-epoxy composite exhibited dielectric permittivity and losses two orders of magnitude lower than those of BM-PT ceramics that opened new prospects to application. One relaxation process in BM-PT-epoxy composite related to the ceramics fill contribution. Other induced relaxation, observed only in this composite, was attributed to interactions at interfaces between the introduced powdered ceramics and the epoxy glue matrix. We showed that stresses generated either by hydrostatic pressure or through the interfacial interaction of epoxy matrix led to the same results: relaxation times shortening.

Název v anglickém jazyce

Influence of interfacial stresses on electrical properties of bismuth manganite-lead titanate-epoxy composite

Popis výsledku anglicky

This work compares the dielectric properties of two new materials. One was 0.88 bismuth manganite-0.12 lead titanate (noted BM-PT hereafter) ceramics composite obtained by standard high-temperature sintering. The second composite was obtained from powdered ceramics dispersed in epoxy glue (noted BM-PT-epoxy). The occurrence of four phases in the ceramics, using X-ray powder diffraction (XRD), was recognized: orthorhombic Pbam, cubic Pn3m, cubic Pm3m, and monoclinic P2/m phase. Pseudo-Voigt function fitting confirmed significant structural disorder in the BiMn2O5 crystal lattice. Analysis of broadband dielectric spectroscopy data confirmed the applicability of the small polaron model to explain detected relaxation processes. Involvement of oxygen vacancies in relaxation and their correspondence to ordered, uniform potential wells in crystal lattices was deduced. Electric conductivity relaxation times behavior proved the sensitivity of the ceramics&apos; electrical features to hydrostatic pressure. BM-PT-epoxy composite exhibited dielectric permittivity and losses two orders of magnitude lower than those of BM-PT ceramics that opened new prospects to application. One relaxation process in BM-PT-epoxy composite related to the ceramics fill contribution. Other induced relaxation, observed only in this composite, was attributed to interactions at interfaces between the introduced powdered ceramics and the epoxy glue matrix. We showed that stresses generated either by hydrostatic pressure or through the interfacial interaction of epoxy matrix led to the same results: relaxation times shortening.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

20504 - Ceramics

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2021

Kód důvěrnosti údajů

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

Název periodika

CERAMICS INTERNATIONAL

ISSN

0272-8842

e-ISSN

—

Svazek periodika

47

Číslo periodika v rámci svazku

24

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

14

Strana od-do

34619-34632

Kód UT WoS článku

000725040200003

EID výsledku v databázi Scopus

2-s2.0-85114664092