ISSN:
1572-8943
Schlagwort(e):
adiabaticcalorimetry
;
calcium substituted lanthanum chromium(III) oxide
;
perovskite-type oxides
;
redox thermochemistry
Quelle:
Springer Online Journal Archives 1860-2000
Thema:
Chemie und Pharmazie
Notizen:
Abstract A novel calorimetric approach to the energetics of redox reactions in non-stoichiometric oxides is presented. The method utilizes a step-wise heated adiabatic calorimeter for determination of average enthalpies of oxidation. The measurement uncertainty is dominated by the uncertainty in the determination of the mass increment due to the oxidation. An experimental investigation of the re-oxidation energetics of reduced La1−yCayCrO3−δ is presented. The variation of the average formal oxidation state with temperature and oxygen fugacity is calculated from the experimentally determined enthalpy of oxidation and an estimated (lattice and configurational) entropy of oxidation. The calculated curves are in good agreement with experimental determinations reported in literature.
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1023/A:1010146326207
Permalink
