PHASE-EQUILIBRIA IN THE LN-MN-O SYSTEM (LN = PR, ND) AND GENERAL-ASPECTS OF THE STABILITY OF THE PEROVSKITE PHASE LNMEO3 / CHEREPANOV VA,BARKHATOVA LY,PETROV AN // JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS. - 1994. - V. 55, l. 3. - P. 229-235.

ISSN/EISSN:

0022-3697 / нет данных

Type:

Article

Abstract:

Phase equilibria in the Pr-Mn-O and Nd-Mn-O systems have been studied between 1100 and 1500 K and in atmospheres with an oxygen partial pressure ranging between 10(-15) and 1 atm. LnMnO3 and LnMn2O5 have been found to form in both systems. PrMn2O5 was synthesized for the first time and has the orthorhombic DyMn2O5-type structure with cell parameters: a = 7.51, b = 8.63 and c = 5.69 angstrom. The thermodynamic stability of complex oxides was studied using TG and emf measurements in a galvanic cell with solid electrolytes. The equilibrium oxygen pressure, the standard Gibbs potential of the decomposition reactions 3LnMn2O5 = 3LnMnO3 + Mn3O4 + O2 and LnMnO3 = 1/2Ln2O3 + MnO + 1/4O2, and the standard Gibbs potential of the formation of the ternary oxides have been calculated. The variation of LnMeO3 stability for the rare earth manganates, and for the 3d-transition metal (Cr, Mn, Co, Ni, Cu) compounds for a given rare earth element is discussed based on geometrical crystallographic criteria and the outer 3d(n) electron configurations.

Author keywords:

PHASE EQUILIBRIA; THERMODYNAMIC PROPERTIES; STABILITY OF PEROVSKITE STRUCTURE RARE-EARTH MANGANITES; 1200-DEGREES-C

DOI:

10.1016/0022-3697(94)90137-6

Web of Science ID:

ISI:A1994NJ73300001

Соавторы в МНС:

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Другие поля

Поле	Значение
Month	MAR
Publisher	PERGAMON-ELSEVIER SCIENCE LTD
Address	THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB
Language	English
Keywords-Plus	RARE-EARTH MANGANITES; 1200-DEGREES-C
Research-Areas	Chemistry; Physics
Web-of-Science-Categories	Chemistry, Multidisciplinary; Physics, Condensed Matter
ResearcherID-Numbers	Cherepanov, Vladimir/E-6451-2014
ORCID-Numbers	Cherepanov, Vladimir/0000-0003-3653-6459
Number-of-Cited-References	20
Usage-Count-Since-2013	6
Journal-ISO	J. Phys. Chem. Solids
Doc-Delivery-Number	NJ733