About: Defects in Zirconia Nanomaterials Doped with Rare-Earth Oxides

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rdf:type	skos:Concept http://linked.opendata.cz/ontology/domain/vavai/Vysledek
rdfs:seeAlso	http://przyrbwn.icm.edu.pl/APP/PDF/125/a125z3p21.pdf
Description	Positron lifetime and coincidence Doppler broadening measurements on ZrO2+3 mol.% RE2O3 (RE = Eu, Gd, Lu) nanopowders and ceramics obtained by sintering these nanopowders are reported. The initial nanopowders were prepared by a co-precipitation technique and exhibited a mean particle size of approximate to 15 nm. The nanopowders were calcined and pressure-compacted. All compacted nanopowders exhibited the prevailing tetragonal phase with at most 15% of the monoclinic admixture. Positrons in compacted nanopowders were found to annihilate almost exclusively at grain boundaries: (i) vacancy-like misfit defects along grain boundaries and (ii) larger defects situated at intersections of grain boundaries (triple points). In nanopowders, a small portion of positrons formed positronium in pores between crystallites. Sintering of nanopowders at 1500 degrees C caused a substantial grain growth and formation of ceramics. Sintering-induced grain growth led to a disappearance of the triple points and pores. The ceramics containing Eu and Gd dopants consist of mixture of the monoclinic and the tetragonal phase, while the ceramics with Lu dopant exhibits almost exclusively the tetragonal phase. Positron lifetime and coincidence Doppler broadening measurements on ZrO2+3 mol.% RE2O3 (RE = Eu, Gd, Lu) nanopowders and ceramics obtained by sintering these nanopowders are reported. The initial nanopowders were prepared by a co-precipitation technique and exhibited a mean particle size of approximate to 15 nm. The nanopowders were calcined and pressure-compacted. All compacted nanopowders exhibited the prevailing tetragonal phase with at most 15% of the monoclinic admixture. Positrons in compacted nanopowders were found to annihilate almost exclusively at grain boundaries: (i) vacancy-like misfit defects along grain boundaries and (ii) larger defects situated at intersections of grain boundaries (triple points). In nanopowders, a small portion of positrons formed positronium in pores between crystallites. Sintering of nanopowders at 1500 degrees C caused a substantial grain growth and formation of ceramics. Sintering-induced grain growth led to a disappearance of the triple points and pores. The ceramics containing Eu and Gd dopants consist of mixture of the monoclinic and the tetragonal phase, while the ceramics with Lu dopant exhibits almost exclusively the tetragonal phase. (en)
Title	Defects in Zirconia Nanomaterials Doped with Rare-Earth Oxides Defects in Zirconia Nanomaterials Doped with Rare-Earth Oxides (en)
skos:prefLabel	Defects in Zirconia Nanomaterials Doped with Rare-Earth Oxides Defects in Zirconia Nanomaterials Doped with Rare-Earth Oxides (en)
skos:notation	RIV/00216208:11320/14:10288510!RIV15-MSM-11320___
http://linked.open...avai/riv/aktivita	I P
http://linked.open...avai/riv/aktivity	I, P(GAP108/11/1396)
http://linked.open...iv/cisloPeriodika	3
http://linked.open...vai/riv/dodaniDat	2015
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	10003
http://linked.open...ai/riv/idVysledku	RIV/00216208:11320/14:10288510
http://linked.open...riv/jazykVysledku	eng - angličtina
http://linked.open.../riv/klicovaSlova	positron-lifetime; annihilation lifetime; yttria-stabilized zirconia (en)
http://linked.open.../riv/klicoveSlovo	annihilation lifetime positron-lifetime yttria-stabilized zirconia
http://linked.open...odStatuVydavatele	PL - Polská republika
http://linked.open...ontrolniKodProRIV	[ACA8F94464B1]
http://linked.open...i/riv/nazevZdroje	Acta Physica Polonica A
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
http://linked.open...UplatneniVysledku	2014
http://linked.open...v/svazekPeriodika	125
http://linked.open...iv/tvurceVysledku	Melikhova, Oksana Procházka, Ivan Čížek, Jakub Danilenko, I. A. Konstantinova, T. E.
http://linked.open...ain/vavai/riv/wos	000339826300022
issn	0587-4246
number of pages	4 (xsd:int)
http://bibframe.org/vocab/doi	10.12693/APhysPolA.125.760
http://localhost/t...ganizacniJednotka	11320

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