Thermodynamic properties of tubular cobaltite Bi3.7Sr11.4Co8O29-delta

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F15%3A10295900" target="_blank" >RIV/00216208:11320/15:10295900 - isvavai.cz</a>

Výsledek na webu

<a href="http://dx.doi.org/10.1016/j.tca.2015.02.012" target="_blank" >http://dx.doi.org/10.1016/j.tca.2015.02.012</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.tca.2015.02.012" target="_blank" >10.1016/j.tca.2015.02.012</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Thermodynamic properties of tubular cobaltite Bi3.7Sr11.4Co8O29-delta

Popis výsledku v původním jazyce

We synthetized a tubular cobaltite Bi3.7Sr11.4Co8O29-delta ceramics and characterized it using X-ray diffraction (XRD) and scanning electron microscopy with energy dispersive spectroscopy (SEM-EDS). The simultaneous thermal analysis (STA) revealed a veryunusual thermal behavior which was eventually ascribed to metastability of tubular phase at lower temperatures. The heat capacity and enthalpy increments were measured by physical property measurement system (PPMS), differential scanning calorimetry (DSC) and drop calorimetry. The oxygen non-stoichiometry was determined using thermogravimetric measurement (TG) and reduction in hydrogen atmosphere. Above room temperature the temperature dependence of the molar heat capacity was derived by simultaneous least squares method from DSC and enthalpy data. The heat capacity was also analyzed in terms of a combined Debye-Einstein model. The molar entropy s(m)(o) (298.15)= 1349.45J mol(-1) K-1 was evaluated from the low temperature heat capacity

Název v anglickém jazyce

Thermodynamic properties of tubular cobaltite Bi3.7Sr11.4Co8O29-delta

Popis výsledku anglicky

We synthetized a tubular cobaltite Bi3.7Sr11.4Co8O29-delta ceramics and characterized it using X-ray diffraction (XRD) and scanning electron microscopy with energy dispersive spectroscopy (SEM-EDS). The simultaneous thermal analysis (STA) revealed a veryunusual thermal behavior which was eventually ascribed to metastability of tubular phase at lower temperatures. The heat capacity and enthalpy increments were measured by physical property measurement system (PPMS), differential scanning calorimetry (DSC) and drop calorimetry. The oxygen non-stoichiometry was determined using thermogravimetric measurement (TG) and reduction in hydrogen atmosphere. Above room temperature the temperature dependence of the molar heat capacity was derived by simultaneous least squares method from DSC and enthalpy data. The heat capacity was also analyzed in terms of a combined Debye-Einstein model. The molar entropy s(m)(o) (298.15)= 1349.45J mol(-1) K-1 was evaluated from the low temperature heat capacity

Druh

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

CEP obor

BM - Fyzika pevných látek a magnetismus

OECD FORD obor

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Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

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

—

Svazek periodika

605

Číslo periodika v rámci svazku

April

Stát vydavatele periodika

NL - Nizozemsko

Počet stran výsledku

6

Strana od-do

22-27

Kód UT WoS článku

000352177400004

EID výsledku v databázi Scopus

2-s2.0-84923350255