Szczegóły publikacji
Opis bibliograficzny
Phase diagram for the system $Nd-Mn-O$ and thermodynamic properties of $NdMnO_{3}$ and $NdMn_{2}O_{5}$ / K. T. Jacob, Mrinalini Attaluri, K. Fitzner // Calphad : Computer Coupling and Phase Diagrams and Thermochemistry ; ISSN 0364-5916. — 2002 — vol. 26 no. 3, s. 313–325. — Bibliogr. s. 324, Abstr. — Publikacja dostępna online od: 2002-12-21. — K. Fitzner - afiliacja: Institute of Metallurgy and Materials Science, Polish Academy of Sciences, Krakow
Autorzy (3)
- Jacob Kallarackel Thomas
- Attaluri Mrinalini
- Fitzner Krzysztof
Dane bibliometryczne
| ID BaDAP | 17176 |
|---|---|
| Data dodania do BaDAP | 2004-09-01 |
| Tekst źródłowy | URL |
| DOI | 10.1016/S0364-5916(02)00047-0 |
| Rok publikacji | 2002 |
| Typ publikacji | artykuł w czasopiśmie |
| Otwarty dostęp |  |
| Czasopismo/seria | Calphad |
Abstract
Studies on the phase relations in the system Nd-Mn-O at 1223 K showed two stable ternary compounds, NdMnO3 and NdMn2O5. An isothermal section of the ternary phase diagram for the system Nd-Mn-O was constructed based on phase analysis of samples quenched after equilibration using XRPD and EDS. An advanced version of the solid-state cell incorporating a buffer electrode was used to determine the Gibbs energies of decomposition of NdMnO3 and NdMn2O5 in the temperature range from 925 to 1400 K. Pure oxygen gas at 0.1 MPa was used as the reference electrode, and yttria-stabilized zirconia as the solid electrolyte. The buffer electrode was designed to prevent polarization of the three-phase electrode and ensure accurate data. The measured oxygen potential corresponding to the reaction, 2 Nd2O3 + 4 MnO + O-2 –> 4 NdMnO3 can be represented by the equation, Amu(o2) / J.mol(-1) (+/-580) = -523 960 + 170.96 (T/K) Similarly, for the formation of NdMn2O5 according to the reaction, 3 NdMnO3 + Mn3O4 + O-2 –> 3 NdMn2O5 Amu(o2) / J.mol(-1) (+/-660) = - 269 390 + 181.74 (T/K) (C) 2002 Elsevier Science Ltd. All rights reserved.
