journal article·2025-12

High-pressure, high-temperature CALPHAD modelling of Ir–Os–Pt system

Julien Garcia, Jean-Marc Joubert

Calphad· Volume 91
Publisher page

Abstract

In this paper, we use the CALPHAD method to describe iridium at high pressure and high temperature, based on the Lu's model as revisited by Joubert et al. (Calphad: Comput. Coupling Phase Diagrams Thermochem., 74 (2021) 102304). A comprehensive literature review allowed us to obtain the equation of state for both the solid and liquid phases of Ir. We optimized the ambient-pressure phase diagrams of the Ir-Os and Ir-Pt systems with the experimental data from the literature and calculations performed in this study The successful reproduction of high-pressure experimental data for these alloys for the binary Ir-Os system, suggests a reliable description of both pure elements. Consequently, we can propose, for the first time, an extrapolation of the Ir-Os-Pt ternary diagram based on the descriptions of the binary systems.
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Research context

OpenAlex topics: High-pressure geophysics and materials · Rare-earth and actinide compounds · Metallurgical and Alloy Processes

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