A method for the estimation of the enthalpy of formation of mixed oxides in Al2O3?Ln2O3 systems

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60461373%3A22310%2F09%3A00021471" target="_blank" >RIV/60461373:22310/09:00021471 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/60461373:22340/09:00021857

Výsledek na webu

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DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

A method for the estimation of the enthalpy of formation of mixed oxides in Al2O3?Ln2O3 systems

Popis výsledku v původním jazyce

A new method is proposed for the estimation of the enthalpy of formation (Delta H-ox) of various Al2O3-Ln(2)O(3) mixed oxides from the constituent binary oxides. Our method is based on Pauling's concept of electronegativity and, in particular, on the relation between the enthalpy of formation of a binary oxide and the difference between the electronegativities of the oxide-forming element and oxygen. This relation is extended to mixed oxides with a simple formula given for the calculation of Delta H-ox.The parameters of this equation were fitted using published experimental values of Delta H-ox derived from high-temperature oxide melt solution calorimetry. Using our proposed method, we obtained a standard deviation (sigma) of 4.87 kJ mol(-1) for thisdata set. Taking into account regularities within the lanthanide series, we then estimated the Delta H-ox values for Al2O3-Ln(2)O(3) mixed oxides. The values estimated using our method were compared with those obtained by Aronson's and Zh

Název v anglickém jazyce

A method for the estimation of the enthalpy of formation of mixed oxides in Al2O3?Ln2O3 systems

Popis výsledku anglicky

A new method is proposed for the estimation of the enthalpy of formation (Delta H-ox) of various Al2O3-Ln(2)O(3) mixed oxides from the constituent binary oxides. Our method is based on Pauling's concept of electronegativity and, in particular, on the relation between the enthalpy of formation of a binary oxide and the difference between the electronegativities of the oxide-forming element and oxygen. This relation is extended to mixed oxides with a simple formula given for the calculation of Delta H-ox.The parameters of this equation were fitted using published experimental values of Delta H-ox derived from high-temperature oxide melt solution calorimetry. Using our proposed method, we obtained a standard deviation (sigma) of 4.87 kJ mol(-1) for thisdata set. Taking into account regularities within the lanthanide series, we then estimated the Delta H-ox values for Al2O3-Ln(2)O(3) mixed oxides. The values estimated using our method were compared with those obtained by Aronson's and Zh

Druh

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

CEP obor

CF - Fyzikální chemie a teoretická chemie

OECD FORD obor

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Projekt

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Návaznosti

Z - Vyzkumny zamer (s odkazem do CEZ)

Rok uplatnění

2009

Kód důvěrnosti údajů

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

Název periodika

J. Solid State Chem.

ISSN

0022-4596

e-ISSN

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Svazek periodika

182

Číslo periodika v rámci svazku

4

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

5

Strana od-do

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Kód UT WoS článku

000265122500013

EID výsledku v databázi Scopus

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