Heat capacity, entropy, oxygen non-stoichiometry and magnetic properties of cobalt sillenite Bi24Co2O39-delta

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60461373%3A22310%2F15%3A43900098" target="_blank" >RIV/60461373:22310/15:43900098 - isvavai.cz</a>

Výsledek na webu

<a href="http://www.sciencedirect.com/science/article/pii/S0040603115003858" target="_blank" >http://www.sciencedirect.com/science/article/pii/S0040603115003858</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.tca.2015.09.019" target="_blank" >10.1016/j.tca.2015.09.019</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Heat capacity, entropy, oxygen non-stoichiometry and magnetic properties of cobalt sillenite Bi24Co2O39-delta

Popis výsledku v původním jazyce

We synthesized the cobalt sillenite with overall stoichiometry Bi24Co2O39-delta using conventional ceramic route and characterized it in detail. XRD and EDS were used to determine phase purity and Rietveld refinement was applied to determine lattice parameters. Relaxation time calorimetry and DSC were used to measure low temperature heat capacity and to evaluate the molar entropy. Low temperature heat capacity was then analyzed by a combination of Einstein and Debye model. Thermal stability and oxygen non-stoichiometry were analyzed using STA. Drop experiments were performed to evaluate the dependence of high-temperature heat capacity. Magnetic properties were studied by vibrating sample magnetometry. The obtained results were applied to re-assess thethermodynamic model of sillenite phase and the ternary Bi-Co-O phase diagram. This knowledge is essential for the construction of the entire Bi-Sr-Co-O phase diagram involving ternary phases with outstanding thermoelectric properties.

Název v anglickém jazyce

Heat capacity, entropy, oxygen non-stoichiometry and magnetic properties of cobalt sillenite Bi24Co2O39-delta

Popis výsledku anglicky

We synthesized the cobalt sillenite with overall stoichiometry Bi24Co2O39-delta using conventional ceramic route and characterized it in detail. XRD and EDS were used to determine phase purity and Rietveld refinement was applied to determine lattice parameters. Relaxation time calorimetry and DSC were used to measure low temperature heat capacity and to evaluate the molar entropy. Low temperature heat capacity was then analyzed by a combination of Einstein and Debye model. Thermal stability and oxygen non-stoichiometry were analyzed using STA. Drop experiments were performed to evaluate the dependence of high-temperature heat capacity. Magnetic properties were studied by vibrating sample magnetometry. The obtained results were applied to re-assess thethermodynamic model of sillenite phase and the ternary Bi-Co-O phase diagram. This knowledge is essential for the construction of the entire Bi-Sr-Co-O phase diagram involving ternary phases with outstanding thermoelectric properties.

Druh

J_x - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)

CEP obor

CA - Anorganická chemie

OECD FORD obor

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Projekt

<a href="/cs/project/GA13-17538S" target="_blank" >GA13-17538S: Oxidové termoelektrické materiály pro konverzi vysokoteplotního odpadního tepla</a><br>

Návaznosti

S - Specificky vyzkum na vysokych skolach

Rok uplatnění

2015

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Thermochimica Acta

ISSN

0040-6031

e-ISSN

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Svazek periodika

619

Číslo periodika v rámci svazku

NOV 10 2015

Stát vydavatele periodika

NL - Nizozemsko

Počet stran výsledku

6

Strana od-do

26-31

Kód UT WoS článku

000363824000005

EID výsledku v databázi Scopus

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