About: Thermodynamic behavior of Ca3Co3.93+xO9+delta ceramics

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rdf:type	skos:Concept http://linked.opendata.cz/ontology/domain/vavai/Vysledek
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. (en)
Title	Thermodynamic behavior of Ca3Co3.93+xO9+delta ceramics Thermodynamic behavior of Ca3Co3.93+xO9+delta ceramics (en)
skos:prefLabel	Thermodynamic behavior of Ca3Co3.93+xO9+delta ceramics Thermodynamic behavior of Ca3Co3.93+xO9+delta ceramics (en)
skos:notation	RIV/60461373:22310/12:43893547!RIV13-GA0-22310___
http://linked.open...avai/predkladatel	Fakulta chemické technologie
http://linked.open...avai/riv/aktivita	P Z
http://linked.open...avai/riv/aktivity	P(GA104/09/0621), P(GA106/09/0125), Z(AV0Z10100521), Z(MSM6046137302)
http://linked.open...iv/cisloPeriodika	2
http://linked.open...vai/riv/dodaniDat	2013
http://linked.open...aciTvurceVysledku	Sedmidubský, David Sofer, Zdeněk Jankovský, Ondřej Šimek, Petr
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	Vysoká škola chemicko-technologická v Praze / Fakulta chemické technologie
http://linked.open...dnocenehoVysledku	174296
http://linked.open...ai/riv/idVysledku	RIV/60461373:22310/12:43893547
http://linked.open...riv/jazykVysledku	eng - angličtina
http://linked.open.../riv/klicovaSlova	Phase equlibria; Debye-Einstein model; Thermodynamic properties; Heat capacity; Thermoelectric materials; Misfit cobaltites (en)
http://linked.open.../riv/klicoveSlovo	Debye-Einstein model Phase equlibria Thermoelectric materials Misfit cobaltites Heat capacity Thermodynamic properties
http://linked.open...odStatuVydavatele	CZ - Česká republika
http://linked.open...ontrolniKodProRIV	[2463E1F83AB2]
http://linked.open...i/riv/nazevZdroje	Ceramics-Silikáty
http://linked.open...in/vavai/riv/obor	CA
http://linked.open...ichTvurcuVysledku	4 (xsd:int)
http://linked.open...cetTvurcuVysledku	5 (xsd:int)
http://linked.open...vavai/riv/projekt	Preparation and characterization of metal/polymer structures ZnO-based magnetic semiconductors
http://linked.open...UplatneniVysledku	2012
http://linked.open...v/svazekPeriodika	56
http://linked.open...iv/tvurceVysledku	Sofer, Zdeněk Šimek, Petr Sedmidubský, David Hejtmánek, Jiří Jankovský, Ondřej
http://linked.open...ain/vavai/riv/wos	000307678000010
http://linked.open...n/vavai/riv/zamer	Physics and technology of nanostructures, surfaces and thin films Preparation and research of functional materials and material technologies using micro- and nanoscopic methods
issn	0862-5468
number of pages	6 (xsd:int)
http://localhost/t...ganizacniJednotka	22310
is http://linked.open...avai/riv/vysledek of	Thermodynamic behavior of Ca3Co3.93+xO9+delta ceramics

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