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Statements

Subject Item
n2:RIV%2F60461373%3A22310%2F12%3A43893528%21RIV13-GA0-22310___
rdf:type
n4:Vysledek skos:Concept
dcterms:description
We prepared misfit Bi(2)Sr(2)Co(1.8)Ox (Bi-222) phase as a member of a Bi-Sr-Co-O family. Two water based sol-gel methods were chosen with regard to the presence of a strongly hydrolysing Bi3+ ion - chelating route combining EDTA (ethylenediaminetetraacetic acid) and TEA (triethanolamine) and, secondly, water soluble polymer method using PEI (polyethylenimine). We focused on the influence of gel decomposition process on the grain size of precursor and, consequently, on the bulk density of the final samples. We tested decomposition in N-2 atmosphere followed by a treatment in pure oxygen. The precursors decomposed in %22N-2/O-2%22 regime were mainly composed of Bi2O3, SrCO3 and cobalt oxides with the grain size of approximately 50-100 nm. The powders arising from gel decomposition in air contained the desired Bi-Sr-Co-O oxide as the major phase independently of the chosen sol-gel method. The final sintered samples were almost single-phase with traces of the other pseudoternary phase Bi2Sr2CoOx independently of the decomposition atmosphere. For comparison, samples were also prepared by solid state reaction. The sol-gel prepared samples were always of higher bulk density with larger grains, moreover partly microstructurally ordered. These facts were also reflected in transport thermoelectric measurements. We prepared misfit Bi(2)Sr(2)Co(1.8)Ox (Bi-222) phase as a member of a Bi-Sr-Co-O family. Two water based sol-gel methods were chosen with regard to the presence of a strongly hydrolysing Bi3+ ion - chelating route combining EDTA (ethylenediaminetetraacetic acid) and TEA (triethanolamine) and, secondly, water soluble polymer method using PEI (polyethylenimine). We focused on the influence of gel decomposition process on the grain size of precursor and, consequently, on the bulk density of the final samples. We tested decomposition in N-2 atmosphere followed by a treatment in pure oxygen. The precursors decomposed in %22N-2/O-2%22 regime were mainly composed of Bi2O3, SrCO3 and cobalt oxides with the grain size of approximately 50-100 nm. The powders arising from gel decomposition in air contained the desired Bi-Sr-Co-O oxide as the major phase independently of the chosen sol-gel method. The final sintered samples were almost single-phase with traces of the other pseudoternary phase Bi2Sr2CoOx independently of the decomposition atmosphere. For comparison, samples were also prepared by solid state reaction. The sol-gel prepared samples were always of higher bulk density with larger grains, moreover partly microstructurally ordered. These facts were also reflected in transport thermoelectric measurements.
dcterms:title
Bi-Sr-Co-O thermoelectrics prepared by sol-gel methods with modified gel decomposition Bi-Sr-Co-O thermoelectrics prepared by sol-gel methods with modified gel decomposition
skos:prefLabel
Bi-Sr-Co-O thermoelectrics prepared by sol-gel methods with modified gel decomposition Bi-Sr-Co-O thermoelectrics prepared by sol-gel methods with modified gel decomposition
skos:notation
RIV/60461373:22310/12:43893528!RIV13-GA0-22310___
n4:predkladatel
n5:orjk%3A22310
n3:aktivita
n14:Z n14:P
n3:aktivity
P(GA203/09/1036), Z(AV0Z10100521)
n3:cisloPeriodika
September
n3:dodaniDat
n13:2013
n3:domaciTvurceVysledku
n9:6541690 n9:4268520 n9:3950182 n9:4236602
n3:druhVysledku
n21:J
n3:duvernostUdaju
n18:S
n3:entitaPredkladatele
n6:predkladatel
n3:idSjednocenehoVysledku
125232
n3:idVysledku
RIV/60461373:22310/12:43893528
n3:jazykVysledku
n10:eng
n3:klicovaSlova
sol-gel methods; thermoelectrics; Bi-Sr-Co-O
n3:klicoveSlovo
n8:sol-gel%20methods n8:Bi-Sr-Co-O n8:thermoelectrics
n3:kodStatuVydavatele
GB - Spojené království Velké Británie a Severního Irska
n3:kontrolniKodProRIV
[A240D2EEE24C]
n3:nazevZdroje
E-MRS 2011 Fall Symposium K: Solution-derived Electronic-oxide Films, Nanostructures and Patterning, from Materials to Devices. IOP Conference Series
n3:obor
n20:CA
n3:pocetDomacichTvurcuVysledku
4
n3:pocetTvurcuVysledku
5
n3:projekt
n11:GA203%2F09%2F1036
n3:rokUplatneniVysledku
n13:2012
n3:svazekPeriodika
30
n3:tvurceVysledku
Hejtmánek, Jiří Rubešová, Kateřina Hlásek, Tomáš Sedmidubský, David Jakeš, Vít
n3:wos
000300933300005
n3:zamer
n15:AV0Z10100521
s:issn
1757-8981
s:numberOfPages
5
n19:doi
10.1088/1757-899X/30/1/012004
n17:organizacniJednotka
22310