Defects and sintering-induced diffusion processes in yttria-stabilised zirconia nanomaterials studied by positron annihilation spectroscopy

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F14%3A10290420" target="_blank" >RIV/00216208:11320/14:10290420 - isvavai.cz</a>

Výsledek na webu

<a href="http://www.scientific.net/DF.1.155" target="_blank" >http://www.scientific.net/DF.1.155</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.4028/www.scientific.net/DF.1.155" target="_blank" >10.4028/www.scientific.net/DF.1.155</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Defects and sintering-induced diffusion processes in yttria-stabilised zirconia nanomaterials studied by positron annihilation spectroscopy

Popis výsledku v původním jazyce

In the present work, zirconia (ZrO2) nanopowders doped with yttria (Y2O3) and chromia (Cr2O3) were prepared by a co-precipitation technique. The nanopowders were then subjected to a calcination and a successive sintering at elevated temperatures up to 1500 C. The nanostructures in these nanomaterials were characterized by positron annihilation spectroscopy (positron lifetimes and Doppler broadening measurements) which is a non-destructive technique with a high sensitivity to atomic-scale open-volume defects. It was found that the zirconia-based nanomaterials studied contain vacancy-like defects and nano-scale pores. Diffusion processes induced in these nanomaterials by sintering were investigated also by depth sensitive positron annihilation studies using a variable energy slow positron beam. Sintering was found to cause intensive grain growth and a removal of porosity by a migration of pores from the sample interior toward its surface.

Název v anglickém jazyce

Defects and sintering-induced diffusion processes in yttria-stabilised zirconia nanomaterials studied by positron annihilation spectroscopy

Popis výsledku anglicky

In the present work, zirconia (ZrO2) nanopowders doped with yttria (Y2O3) and chromia (Cr2O3) were prepared by a co-precipitation technique. The nanopowders were then subjected to a calcination and a successive sintering at elevated temperatures up to 1500 C. The nanostructures in these nanomaterials were characterized by positron annihilation spectroscopy (positron lifetimes and Doppler broadening measurements) which is a non-destructive technique with a high sensitivity to atomic-scale open-volume defects. It was found that the zirconia-based nanomaterials studied contain vacancy-like defects and nano-scale pores. Diffusion processes induced in these nanomaterials by sintering were investigated also by depth sensitive positron annihilation studies using a variable energy slow positron beam. Sintering was found to cause intensive grain growth and a removal of porosity by a migration of pores from the sample interior toward its surface.

Druh

C - Kapitola v odborné knize

CEP obor

JH - Keramika, žáruvzdorné materiály a skla

OECD FORD obor

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Projekt

<a href="/cs/project/GAP108%2F11%2F1396" target="_blank" >GAP108/11/1396: Vliv substitučních příměsí a hranic zrn na vlastnosti nanokrystalických materiálů na bázi oxidu zirkonu</a><br>

Návaznosti

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 knihy nebo sborníku

Diffusion in Advanced Materials

ISBN

978-3-03835-081-1

Počet stran výsledku

19

Strana od-do

155-172

Počet stran knihy

218

Název nakladatele

TRANS TECH PUBLICATIONS LTD

Místo vydání

Switzerland

Kód UT WoS kapitoly

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