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Statements

Subject Item
n2:RIV%2F60461373%3A22310%2F12%3A43893547%21RIV13-GA0-22310___
rdf:type
skos:Concept n3:Vysledek
dcterms:description
Based on the results of differential thermal analysis, differential scanning calorimetry, thermogavimetric analysis, low temperature calorimetry and X-Ray powder diffraction of equilibrated samples as well as on the assessed thermodynamic data phase a section of the Ca-Co-O diagram for p(O2) = 0.21 was calculated using the FactSage software. Among the involved phases the misfit cobaltite Ca3Co3.93+xO9+delta is well known for its distinctive thermoelectric properties. As shown by our experiments and reproduced by the proposed thermodynamic model the Ca3Co3.93+xO9+delta phase actually exhibits a narrow homogeneity range with respect to cation composition. The primary focus was put on the heat capacity of Ca3Co3.93+xO9+delta collected in a broad temperature range and analyzed in terms of a combined Debye - Einstein model. This made it possible to separate two peaks detected at similar to 400 K and similar to 840 K and to evaluate the corresponding entropy and enthalpy changes. The second effect was interpreted as a spin transition from intermediate state to high state. Based on the results of differential thermal analysis, differential scanning calorimetry, thermogavimetric analysis, low temperature calorimetry and X-Ray powder diffraction of equilibrated samples as well as on the assessed thermodynamic data phase a section of the Ca-Co-O diagram for p(O2) = 0.21 was calculated using the FactSage software. Among the involved phases the misfit cobaltite Ca3Co3.93+xO9+delta is well known for its distinctive thermoelectric properties. As shown by our experiments and reproduced by the proposed thermodynamic model the Ca3Co3.93+xO9+delta phase actually exhibits a narrow homogeneity range with respect to cation composition. The primary focus was put on the heat capacity of Ca3Co3.93+xO9+delta collected in a broad temperature range and analyzed in terms of a combined Debye - Einstein model. This made it possible to separate two peaks detected at similar to 400 K and similar to 840 K and to evaluate the corresponding entropy and enthalpy changes. The second effect was interpreted as a spin transition from intermediate state to high state.
dcterms:title
Thermodynamic behavior of Ca3Co3.93+xO9+delta ceramics Thermodynamic behavior of Ca3Co3.93+xO9+delta ceramics
skos:prefLabel
Thermodynamic behavior of Ca3Co3.93+xO9+delta ceramics Thermodynamic behavior of Ca3Co3.93+xO9+delta ceramics
skos:notation
RIV/60461373:22310/12:43893547!RIV13-GA0-22310___
n3:predkladatel
n4:orjk%3A22310
n5:aktivita
n14:P n14:Z
n5:aktivity
P(GA104/09/0621), P(GA106/09/0125), Z(AV0Z10100521), Z(MSM6046137302)
n5:cisloPeriodika
2
n5:dodaniDat
n17:2013
n5:domaciTvurceVysledku
n10:5250226 n10:6562108 n10:6541690 n10:3148262
n5:druhVysledku
n13:J
n5:duvernostUdaju
n19:S
n5:entitaPredkladatele
n20:predkladatel
n5:idSjednocenehoVysledku
174296
n5:idVysledku
RIV/60461373:22310/12:43893547
n5:jazykVysledku
n12:eng
n5:klicovaSlova
Phase equlibria; Debye-Einstein model; Thermodynamic properties; Heat capacity; Thermoelectric materials; Misfit cobaltites
n5:klicoveSlovo
n6:Thermodynamic%20properties n6:Thermoelectric%20materials n6:Heat%20capacity n6:Debye-Einstein%20model n6:Misfit%20cobaltites n6:Phase%20equlibria
n5:kodStatuVydavatele
CZ - Česká republika
n5:kontrolniKodProRIV
[2463E1F83AB2]
n5:nazevZdroje
Ceramics-Silikáty
n5:obor
n11:CA
n5:pocetDomacichTvurcuVysledku
4
n5:pocetTvurcuVysledku
5
n5:projekt
n7:GA104%2F09%2F0621 n7:GA106%2F09%2F0125
n5:rokUplatneniVysledku
n17:2012
n5:svazekPeriodika
56
n5:tvurceVysledku
Sofer, Zdeněk Šimek, Petr Sedmidubský, David Jankovský, Ondřej Hejtmánek, Jiří
n5:wos
000307678000010
n5:zamer
n18:MSM6046137302 n18:AV0Z10100521
s:issn
0862-5468
s:numberOfPages
6
n16:organizacniJednotka
22310