About: Defect studies of yttria stabilized zirconia with chromia additive

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rdf:type	skos:Concept http://linked.opendata.cz/ontology/domain/vavai/Vysledek
rdfs:seeAlso	http://www.sciencedirect.com/science/article/pii/S187538921201961X
Description	The effect of chromia (Cr2O3) additive on defects in yttria (Y2O3) stabilized zirconia (ZrO2) was examined in the present work. Two kinds of samples were investigated: (i) compacted nanopowders with grain size of 12-23 nm and (ii) sintered ceramics. Defect characterization was performed by high resolution positron lifetime spectroscopy. Because of nanocrystalline grain size positrons in compacted nanopowders probe almost exclusively grain boundaries. It was found that in compacted nanopowders positrons are trapped in vacancy-like misfit defect at grain boundaries and in larger defects situated at triple points. On the other hand, in ceramics positrons are annihilated predominantly in Zr-vacancies in grain interiors. Our results give a strong evidence for segregation of Cr cations at grain boundaries. Positron lifetime results for compacted nanopowders are strongly influenced by the Cr2O3 concentration, while results obtained in ceramics are very similar independently on the Cr2O3 content. Moreover, it was found that Cr2O3 additive completely suppresses the formation of positronium in open inter-granular volumes. The effect of chromia (Cr2O3) additive on defects in yttria (Y2O3) stabilized zirconia (ZrO2) was examined in the present work. Two kinds of samples were investigated: (i) compacted nanopowders with grain size of 12-23 nm and (ii) sintered ceramics. Defect characterization was performed by high resolution positron lifetime spectroscopy. Because of nanocrystalline grain size positrons in compacted nanopowders probe almost exclusively grain boundaries. It was found that in compacted nanopowders positrons are trapped in vacancy-like misfit defect at grain boundaries and in larger defects situated at triple points. On the other hand, in ceramics positrons are annihilated predominantly in Zr-vacancies in grain interiors. Our results give a strong evidence for segregation of Cr cations at grain boundaries. Positron lifetime results for compacted nanopowders are strongly influenced by the Cr2O3 concentration, while results obtained in ceramics are very similar independently on the Cr2O3 content. Moreover, it was found that Cr2O3 additive completely suppresses the formation of positronium in open inter-granular volumes. (en)
Title	Defect studies of yttria stabilized zirconia with chromia additive Defect studies of yttria stabilized zirconia with chromia additive (en)
skos:prefLabel	Defect studies of yttria stabilized zirconia with chromia additive Defect studies of yttria stabilized zirconia with chromia additive (en)
skos:notation	RIV/00216208:11320/12:10129924!RIV13-AV0-11320___
http://linked.open...avai/predkladatel	Matematicko-fyzikální fakulta
http://linked.open...avai/riv/aktivita	P Z
http://linked.open...avai/riv/aktivity	P(GAP108/11/1396), P(KJB101120906), Z(MSM0021620834)
http://linked.open...iv/cisloPeriodika	July 2012
http://linked.open...vai/riv/dodaniDat	2013
http://linked.open...aciTvurceVysledku	Melikhova, Oksana Procházka, Ivan Čížek, Jakub
http://linked.open.../riv/druhVysledku	J - Článek v odborném periodiku
http://linked.open...iv/duvernostUdaju	S - Úplné a pravdivé údaje nepodléhající ochraně podle zvláštních právních předpisů
http://linked.open...titaPredkladatele	Univerzita Karlova v Praze / Matematicko-fyzikální fakulta
http://linked.open...dnocenehoVysledku	129831
http://linked.open...ai/riv/idVysledku	RIV/00216208:11320/12:10129924
http://linked.open...riv/jazykVysledku	eng - angličtina
http://linked.open.../riv/klicovaSlova	ceramics; nanocrystaline materials; yttria stabilized zirconia (en)
http://linked.open.../riv/klicoveSlovo	nanocrystaline materials ceramics yttria stabilized zirconia
http://linked.open...odStatuVydavatele	NL - Nizozemsko
http://linked.open...ontrolniKodProRIV	[44B56ECD27A2]
http://linked.open...i/riv/nazevZdroje	Physics Procedia
http://linked.open...in/vavai/riv/obor	BM
http://linked.open...ichTvurcuVysledku	3 (xsd:int)
http://linked.open...cetTvurcuVysledku	5 (xsd:int)
http://linked.open...vavai/riv/projekt	Effect of substitutional elements and grain boundaries on properties of nanocrystalline zirconia-based materials Hydrogen interaction with defects in zirconia
http://linked.open...UplatneniVysledku	2012
http://linked.open...v/svazekPeriodika	35
http://linked.open...iv/tvurceVysledku	Melikhova, Oksana Procházka, Ivan Čížek, Jakub Konstantinova, T. E. Danilenko, I.A
http://linked.open...ain/vavai/riv/wos	000314358300023
http://linked.open...n/vavai/riv/zamer	Condensed Matter Physics – New Materials and Technologies
issn	1875-3892
number of pages	6 (xsd:int)
http://bibframe.org/vocab/doi	10.1016/j.phpro.2012.06.024
http://localhost/t...ganizacniJednotka	11320
is http://linked.open...avai/riv/vysledek of	Defect studies of yttria stabilized zirconia with chromia additive

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