Thermodynamic properties of misfit cobaltite [Bi2-xCa2O4] [CoO2](1.7)
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60461373%3A22310%2F17%3A43913372" target="_blank" >RIV/60461373:22310/17:43913372 - isvavai.cz</a>
Alternative codes found
RIV/60461373:22340/17:43913372
Result on the web
<a href="https://www.sciencedirect.com/science/article/pii/S0040603117302320" target="_blank" >https://www.sciencedirect.com/science/article/pii/S0040603117302320</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1016/j.tca.2017.09.011" target="_blank" >10.1016/j.tca.2017.09.011</a>
Alternative languages
Result language
angličtina
Original language name
Thermodynamic properties of misfit cobaltite [Bi2-xCa2O4] [CoO2](1.7)
Original language description
We synthetized a misfit structure cobaltite [Bi2-xCa2O4] [CoO2](1.7) and studied its thermal behavior by simultaneous thermal analysis (STA), low temperature heat capacity measurement in physical property measurement system (PPMS), differential scanning calorimetry (DSC) to measure heat capacity and drop calorimetry to obtain the relative enthalpy increments. The oxygen non-stoichiometry determined by thermogravimetry (STA data combined with weight loss measurement of the material reduced in hydrogen atmosphere) was analyzed in terms of point defect model resulting in two independent reactions, oxygen release and cobalt disproportionation, described by the respective enthalpy and entropy changes. The applied model satisfactorily describes two regimes of oxygen release/incorporation associated with the respective Co valency changes Co4+/Co3+ and Co3+/Co2+. The temperature dependence of the molar heat capacity above room temperature was derived by simultaneous least squares method from DSC and enthalpy data considering the contribution due to oxygen release and deviation from ideal stoichiometry. The low temperature heat capacity was analyzed in terms of a combined Debye Einstein model.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10402 - Inorganic and nuclear chemistry
Result continuities
Project
<a href="/en/project/GA17-13161S" target="_blank" >GA17-13161S: The role of nonstoichimetry and nanosizing in material properties of metal oxides</a><br>
Continuities
S - Specificky vyzkum na vysokych skolach<br>I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
Others
Publication year
2017
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Thermochimica Acta
ISSN
0040-6031
e-ISSN
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Volume of the periodical
656
Issue of the periodical within the volume
OCT 10 2017
Country of publishing house
US - UNITED STATES
Number of pages
6
Pages from-to
129-134
UT code for WoS article
000414816900016
EID of the result in the Scopus database
2-s2.0-85029534437