Phase equilibria and thermodynamics of coexisting phases in rare-earth element--iron--oxygen systems. II. The praseodymium--iron--oxygen system

Journal Article · Thu Jul 01 04:00:00 EDT 1976 · J. Solid State Chem.; (United States)

DOI:https://doi.org/10.1016/0022-4596(76)90104-3· OSTI ID:7360515

Tretyakov, Yu D; Sorokin, V V; Erastova, A P

The phase equilibria and the thermodynamics of coexisting phases in the Pr--Fe--O system were studied using static and dynamic methods for attaining equilibrium with subsequent annealing and identification of the condensed phases by x-ray analysis. Equilibrium phase diagrams were constructed to define the changes that take place in the Pr--Fe--O system on variation of the partial oxygen pressure, the temperature, and the composition of the initial mixture of oxides. An isothermal cross section at 1300/sup 0/K and equilibrium diagrams of the type Po/sub 2/ = f(composition) with T = constant, Po/sub 2/ = f(1/T) with one composition parameter fixed and T = f(composition) with P o/sub 2/ = constant have been constructed. It was shown in the Pr--Fe--O system that only one ternary compound with perovskite structure, PrFeO/sub 3/, is formed, and furthermore, it is stable no matter how high the partial oxygen pressure.

• Research Organization: Moscow State Univ.
• OSTI ID: 7360515
• Journal Information: J. Solid State Chem.; (United States), Journal Name: J. Solid State Chem.; (United States) Vol. 18:3; ISSN JSSCB
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360202* -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
CHALCOGENIDES
IRON COMPOUNDS
IRON OXIDES
OXIDES
OXYGEN COMPOUNDS
PHASE STUDIES
PRASEODYMIUM COMPOUNDS
PRASEODYMIUM OXIDES
RARE EARTH COMPOUNDS
THERMODYNAMICS
TRANSITION ELEMENT COMPOUNDS