Dielectric properties and vacancy-like defects in plasma-sprayed barium titanate.

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61389021%3A_____%2F17%3A00476054" target="_blank" >RIV/61389021:_____/17:00476054 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/00216208:11320/17:10369076 RIV/68407700:21230/17:00315133

Výsledek na webu

<a href="http://dx.doi.org/10.1111/jace.14840" target="_blank" >http://dx.doi.org/10.1111/jace.14840</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1111/jace.14840" target="_blank" >10.1111/jace.14840</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Dielectric properties and vacancy-like defects in plasma-sprayed barium titanate.

Popis výsledku v původním jazyce

Positron annihilation spectroscopy was employed for investigation of vacancy-like defects in plasma-sprayed barium titanate. Defect studies were combined with measurement of dielectric properties of barium titanate coatings. Samples prepared by gas-stabilized plasma spray (GSP) torch and by plasma torch with the hybrid water-argon stabilization (WSP-H) were studied. Processing parameters were selected so that GSP coatings were sprayed in reductive conditions, whereas WSP-H coatings were prepared in oxidizing environment. As-sprayed GSP coating is dark, whereas WSP-H one is light. The dielectric properties of WSP-H coating are superior to those for GSP one. Defect studies revealed that both GSP and WSP-H coatings contain titanium vacancies. However, GSP coating contains in addition a considerable concentration of oxygen vacancies. Some fraction of oxygen vacancies in GSP coating is coupled with titanium vacancies forming partial Schottky defect. The structure of WSP-H coating is less disordered and contains only a low concentration of oxygen vacancies. This is consistent with reductive and oxidizing conditions in GSP and WSP-H spraying, respectively.Annealing at elevated temperatures in air leads to removal of oxygen vacancies which are filled by oxygen diffusing into the samples.

Název v anglickém jazyce

Dielectric properties and vacancy-like defects in plasma-sprayed barium titanate.

Popis výsledku anglicky

Positron annihilation spectroscopy was employed for investigation of vacancy-like defects in plasma-sprayed barium titanate. Defect studies were combined with measurement of dielectric properties of barium titanate coatings. Samples prepared by gas-stabilized plasma spray (GSP) torch and by plasma torch with the hybrid water-argon stabilization (WSP-H) were studied. Processing parameters were selected so that GSP coatings were sprayed in reductive conditions, whereas WSP-H coatings were prepared in oxidizing environment. As-sprayed GSP coating is dark, whereas WSP-H one is light. The dielectric properties of WSP-H coating are superior to those for GSP one. Defect studies revealed that both GSP and WSP-H coatings contain titanium vacancies. However, GSP coating contains in addition a considerable concentration of oxygen vacancies. Some fraction of oxygen vacancies in GSP coating is coupled with titanium vacancies forming partial Schottky defect. The structure of WSP-H coating is less disordered and contains only a low concentration of oxygen vacancies. This is consistent with reductive and oxidizing conditions in GSP and WSP-H spraying, respectively.Annealing at elevated temperatures in air leads to removal of oxygen vacancies which are filled by oxygen diffusing into the samples.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

20504 - Ceramics

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

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2017

Kód důvěrnosti údajů

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

Název periodika

Journal of the American Ceramic Society

ISSN

0002-7820

e-ISSN

—

Svazek periodika

100

Číslo periodika v rámci svazku

7

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

12

Strana od-do

2972-2983

Kód UT WoS článku

000404730100024

EID výsledku v databázi Scopus

2-s2.0-85021766944