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Based on descriptions of the previously assessed sub-systems, we present a thermodynamic description of the La–Mn–Y–Zr–O system. Ideal extrapolations from ternaries to quaternaries and to La–Mn–Y–Zr–O are proved to be quite successful. The calculated isothermal sections of pseudo-ternaries at different temperatures in air are in good agreement with available experimental data.The thermodynamics at...
The defect chemistry of the perovskite phase LaMnO3±d is modeled using the compound energy formalism and an associate model. In both cases the CALPHAD methodology is applied meaning that all thermodynamic and phase diagram data of the phase is simultaneously and consistently reproduced. The differences between the two modeling methods are discussed and the descriptions are submitted to a defect chemistry...
Using the CALPHAD approach, we model the La 2 O 3 –Y 2 O 3 system as a pseudo-binary section of the La–Y–O ternary system. The descriptions of two binary sub-systems, La–O and Y–O, are taken from previous assessments with revision. The experimental data on the La 2 O 3 –Y 2 O 3 system are reviewed and the parameters related to the La...
In the La–Sr–Mn–O oxide system, the perovskite phase (La,Sr)MnO 3 and the two Ruddlesden–Popper phases, (La,Sr) 2 MnO 4 and (La,Sr) 3 Mn 2 O 7 , are known to show substitution of Sr 2+ for La 3+ . All three phases show very interesting electronic and magnetic properties, such as giant magnetoresistivity (GMR) that strongly depend on the...
We have revised the thermodynamic descriptions of several subsystems of the Ag-Bi-Sr-Ca-Cu-O system. In the Cu-O system the description of the liquid phase was changed to remove an inverted miscibility gap at high temperature and to get a better fit of the CuO liquidus. Also the dissolution model for O in fcc-Cu and fcc-Ag was changed from substitutional to interstitial. The liquid phase description...
Experimental information on the Sr-O system is limited to the properties of pure Sr, SrO, SrO 2 , and O. The data on the thermodynamic properties of SrO, SrO 2 , and the liquid are reviewed and a consistent set of Gibbs energy functions for the Sr-O system is presented.
The experimental data on the Ca-Cu and Sr-Cu systems have been assessed and an optimized set of Gibbs energy functions is presented. The few phase diagram data are found to be in agreement with most thermodynamic measurements and the present optimization gives a good reproduction of the current knowledge on these systems.
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