Thermodynamic Modeling and Calculation of Phase Equilibria in the La-Sr-Mn-O System at Various Temperatures and Partial Pressures of Oxygen

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60461373%3A22310%2F01%3A00004758" target="_blank" >RIV/60461373:22310/01:00004758 - isvavai.cz</a>

Výsledek na webu

—

DOI - Digital Object Identifier

—

Jazyk výsledku

angličtina

Název v původním jazyce

Thermodynamic Modeling and Calculation of Phase Equilibria in the La-Sr-Mn-O System at Various Temperatures and Partial Pressures of Oxygen

Popis výsledku v původním jazyce

The phase diagrams ln(PO2)-x and T-x of the La-Sr-Mn-O system were calculated for two selected cross sections, namely along the lines La1-xSrxMnOy and (La1-x Srx)2MnOy. For the former one, the perovskite phase La1-xSrxMnO3-d coexists with a stoichiometric hexagonal SrMnO3 and the solubility of Sr increases with increasing T and decreasing PO2, as d decreases. At even lower PO2, (La1-x Srx)2MnO4 and MnO are formed at the expense of La1-xSrxMnO3+d , whose stability field starts to shrink. Similarly, for the latter series the solubility of La in (La1-x Srx)2MnO4 increases from almost stoichiometric Sr2MnO4 (PO2~10-4, 1373 K) with decreasing PO2 to the entire range (PO2~10-13, 1373 K). The same effect is achieved by increasing T. The pseudothernary phase diagrams La2O3-SrO-MnOx were eventually constructed for selected values of T and PO2.

Název v anglickém jazyce

Thermodynamic Modeling and Calculation of Phase Equilibria in the La-Sr-Mn-O System at Various Temperatures and Partial Pressures of Oxygen

Popis výsledku anglicky

The phase diagrams ln(PO2)-x and T-x of the La-Sr-Mn-O system were calculated for two selected cross sections, namely along the lines La1-xSrxMnOy and (La1-x Srx)2MnOy. For the former one, the perovskite phase La1-xSrxMnO3-d coexists with a stoichiometric hexagonal SrMnO3 and the solubility of Sr increases with increasing T and decreasing PO2, as d decreases. At even lower PO2, (La1-x Srx)2MnO4 and MnO are formed at the expense of La1-xSrxMnO3+d , whose stability field starts to shrink. Similarly, for the latter series the solubility of La in (La1-x Srx)2MnO4 increases from almost stoichiometric Sr2MnO4 (PO2~10-4, 1373 K) with decreasing PO2 to the entire range (PO2~10-13, 1373 K). The same effect is achieved by increasing T. The pseudothernary phase diagrams La2O3-SrO-MnOx were eventually constructed for selected values of T and PO2.

Druh

D - Stať ve sborníku

CEP obor

BJ - Termodynamika

OECD FORD obor

—

Projekt

—

Návaznosti

Z - Vyzkumny zamer (s odkazem do CEZ)

Rok uplatnění

2001

Kód důvěrnosti údajů

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

Název statě ve sborníku

Development of Materials Science in Research and Education - 11th Joint Seminar

ISBN

80-85330-90-3

ISSN

—

e-ISSN

—

Počet stran výsledku

2

Strana od-do

88-89

Název nakladatele

neznámý

Místo vydání

Bratislava

Místo konání akce

Kežmarské Žleby

Datum konání akce

1. 1. 2001

Typ akce podle státní příslušnosti

CST - Celostátní akce

Kód UT WoS článku

—