Point defect structure of La-doped SrTiO3 ceramics with colossal permittivity
Identifikátory výsledku
Kód výsledku v IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F19%3A10404071" target="_blank" >RIV/00216208:11320/19:10404071 - isvavai.cz</a>
Výsledek na webu
<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=UVVSpgipHn" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=UVVSpgipHn</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1016/j.actamat.2018.10.025" target="_blank" >10.1016/j.actamat.2018.10.025</a>
Alternativní jazyky
Jazyk výsledku
angličtina
Název v původním jazyce
Point defect structure of La-doped SrTiO3 ceramics with colossal permittivity
Popis výsledku v původním jazyce
Sr1-xLaxTiO3 (SLTO) ceramics with colossal permittivity were fabricated by conventional solid-state reaction method. The point defects of pure STO and SLTO ceramics were analyzed by Positron Annihilation Lifetime Spectroscopy (PALS) and Coincidence Doppler Broadening (CDB). The charge compensation mechanisms and dielectric properties of ceramics were investigated. The results indicated that the intrinsic defects in pure STO ceramics were mainly V-Ti''''. The charge compensation mechanism of SLTO ceramics was predominantly formation of V-sr ''. With increasing La content, epsilon(r) of SLTO ceramics increased up to similar to 70000 at room temperature. The results of first-principle calculations indicated that the colossal permittivity came from a sharp polarization increase caused by dipole structure of defects. tan delta of SLTO ceramics showed obvious Debye relaxation at high temperatures and the relaxation showed a multiple relaxation times derived from different kinds of polarization mechanism. The main polarization mechanism of SLTO ceramics gradually changed from ion displacement polarization to defect dipole polarization influenced by the concentration of La dopants. (C) 2018 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
Název v anglickém jazyce
Point defect structure of La-doped SrTiO3 ceramics with colossal permittivity
Popis výsledku anglicky
Sr1-xLaxTiO3 (SLTO) ceramics with colossal permittivity were fabricated by conventional solid-state reaction method. The point defects of pure STO and SLTO ceramics were analyzed by Positron Annihilation Lifetime Spectroscopy (PALS) and Coincidence Doppler Broadening (CDB). The charge compensation mechanisms and dielectric properties of ceramics were investigated. The results indicated that the intrinsic defects in pure STO ceramics were mainly V-Ti''''. The charge compensation mechanism of SLTO ceramics was predominantly formation of V-sr ''. With increasing La content, epsilon(r) of SLTO ceramics increased up to similar to 70000 at room temperature. The results of first-principle calculations indicated that the colossal permittivity came from a sharp polarization increase caused by dipole structure of defects. tan delta of SLTO ceramics showed obvious Debye relaxation at high temperatures and the relaxation showed a multiple relaxation times derived from different kinds of polarization mechanism. The main polarization mechanism of SLTO ceramics gradually changed from ion displacement polarization to defect dipole polarization influenced by the concentration of La dopants. (C) 2018 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
Klasifikace
Druh
J<sub>imp</sub> - Článek v periodiku v databázi Web of Science
CEP obor
—
OECD FORD obor
10302 - Condensed matter physics (including formerly solid state physics, supercond.)
Návaznosti výsledku
Projekt
<a href="/cs/project/GBP108%2F12%2FG043" target="_blank" >GBP108/12/G043: Mikro- a nanokrystalické materiály s vysokým podílem rozhraní pro moderní strukturní aplikace, biodegradabilní implantáty a uchovávání vodíku</a><br>
Návaznosti
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)
Ostatní
Rok uplatnění
2019
Kód důvěrnosti údajů
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Údaje specifické pro druh výsledku
Název periodika
Acta Materialia
ISSN
1359-6454
e-ISSN
—
Svazek periodika
164
Číslo periodika v rámci svazku
October 2018
Stát vydavatele periodika
US - Spojené státy americké
Počet stran výsledku
14
Strana od-do
76-89
Kód UT WoS článku
000456902800007
EID výsledku v databázi Scopus
2-s2.0-85055508463