Positron Annihilation Study of Zirconia Nanopowders and Nanoceramics Stabilized by Magnesia and Ceria

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F14%3A10288516" target="_blank" >RIV/00216208:11320/14:10288516 - isvavai.cz</a>

Výsledek na webu

<a href="http://dx.doi.org/10.1111/jace.12716" target="_blank" >http://dx.doi.org/10.1111/jace.12716</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1111/jace.12716" target="_blank" >10.1111/jace.12716</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Positron Annihilation Study of Zirconia Nanopowders and Nanoceramics Stabilized by Magnesia and Ceria

Popis výsledku v původním jazyce

Positron lifetime (LT) and coincidence Doppler broadening (CDB) measurements on nanopowders and ceramics of ceria- and magnesia-stabilized zirconia (CeSZ and MgSZ, respectively) are presented. The nanopowders were prepared by the coprecipitation technique. Effects of nanopowder calcination and sintering at various temperatures were investigated. In the nanopowders, the two kinds of open-volume defects associated with grain boundaries (GBs) could be identified via positron trapping: (i) vacancy-like misfit defects situated along GBs and (ii) larger defects at the intersections of at least three GBs (triple points). CDB measurements on CeSZ compacted nanopowders indicated a segregation of Ce ions along GBs. A few percent fractions of positrons were foundto form positronium localized in pores of approximate to 1.8nm diameter in compacted nanopowders. Sintering of nanopowders at 1500 degrees C appeared to be sufficient for disappearance of pores and triple point defects. In sintered ceram

Název v anglickém jazyce

Positron Annihilation Study of Zirconia Nanopowders and Nanoceramics Stabilized by Magnesia and Ceria

Popis výsledku anglicky

Positron lifetime (LT) and coincidence Doppler broadening (CDB) measurements on nanopowders and ceramics of ceria- and magnesia-stabilized zirconia (CeSZ and MgSZ, respectively) are presented. The nanopowders were prepared by the coprecipitation technique. Effects of nanopowder calcination and sintering at various temperatures were investigated. In the nanopowders, the two kinds of open-volume defects associated with grain boundaries (GBs) could be identified via positron trapping: (i) vacancy-like misfit defects situated along GBs and (ii) larger defects at the intersections of at least three GBs (triple points). CDB measurements on CeSZ compacted nanopowders indicated a segregation of Ce ions along GBs. A few percent fractions of positrons were foundto form positronium localized in pores of approximate to 1.8nm diameter in compacted nanopowders. Sintering of nanopowders at 1500 degrees C appeared to be sufficient for disappearance of pores and triple point defects. In sintered ceram

Druh

J_x - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)

CEP obor

BM - Fyzika pevných látek a magnetismus

OECD FORD obor

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Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)<br>I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2014

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

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Svazek periodika

97

Číslo periodika v rámci svazku

3

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

8

Strana od-do

982-989

Kód UT WoS článku

000332195700048

EID výsledku v databázi Scopus

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