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Determination of Thermodynamic Properties of Alkaline Earth-liquid Metal Alloys Using the Electromotive Force Technique
Published on: November 3, 2017
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Thermodynamic study of the cerium-cadmium system
Barbara Skołyszewska-Kühberger1, Thomas L Reichmann1, Rajesh Ganesan2
1Department of Inorganic Chemistry/Materials Chemistry, University of Vienna, A-1090 Wien, Austria.
CALPHAD ; Computer Coupling of Phase Diagrams and Thermochemistry
|December 26, 2014
Summary
This study measured cadmium vapor pressures over cerium-cadmium samples to determine thermodynamic activities and enthalpies. These findings help estimate phase boundaries for intermetallic compounds in the cerium-cadmium system.
Area of Science:
- Materials Science
- Thermodynamics
- Physical Chemistry
Background:
- Understanding the thermodynamic properties of alloys is crucial for materials development.
- Cerium-cadmium (Ce-Cd) alloys are of interest for their intermetallic compound formation.
Purpose of the Study:
- To determine cadmium vapor pressures over Ce-Cd samples.
- To calculate thermodynamic activities and partial molar enthalpies of cadmium.
- To estimate phase boundaries of Ce-Cd intermetallic compounds.
Main Methods:
- Isopiestic method for cadmium vapor pressure determination.
- Gibbs-Duhem integration for cerium activities.
- Scanning Electron Microscopy (SEM) for phase boundary analysis.
Main Results:
- Thermodynamic activities of Cd derived from vapor pressure measurements.
- Partial molar enthalpies of Cd obtained from activity temperature dependence.
- Integral Gibbs energies calculated, showing a minimum of -37 kJ/g-atom in the CeCd phase.
- Phase boundaries for CeCd, CeCd2, Ce13Cd58, and CeCd11 estimated.
Conclusions:
- The study provides key thermodynamic data for the Ce-Cd system.
- Phase boundary estimations contribute to understanding intermetallic compound stability.
- The results are valuable for predicting alloy behavior and designing new materials.
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