What question did this study set out to answer?

The aim is to understand the phase equilibria of the Yb2O3-MgO-SiO2 system at high temperatures to aid in the design of coatings and refractory materials.

May 16, 2026

Phase Equilibria of the Yb 2 O 3 ‐MgO‐SiO 2 System at 1600°C and Implications for Environmental Barrier Coatings and Refractories

Key Points

The aim is to understand the phase equilibria of the Yb2O3-MgO-SiO2 system at high temperatures to aid in the design of coatings and refractory materials.
Constructed the isothermal section at 1600°C using high-temperature equilibrium quenching experiments.
Analyzed samples using X-ray diffraction (XRD), scanning electron microscopy (SEM), and electron probe microanalysis (EPMA).
Identified ten phase regions including one liquid phase, four two-phase, and five three-phase regions.
Observed a restricted solubility of Yb2O3 in MgO at 1.61 wt%.
Identified the influence of crystallographic constraints and defect energetics on phase behavior.
Provided essential phase equilibria data for the development of Yb-silicate coatings with enhanced resistance to CMAS and corrosion.

Abstract

ABSTRACT Understanding the phase equilibria of the Yb 2 O 3 ‐MgO‐SiO 2 system is crucial to reveal the coating‐medium interaction mechanism and guide composition design. In the present work, the isothermal section of the Yb 2 O 3 ‐MgO‐SiO 2 system at 1600°C in air was systematically constructed using high‐temperature equilibrium quenching experiment combined with XRD, SEM, and EPMA analyses. Ten phase regions were identified, including one liquid‐phase region, four two‐phase regions, and five three‐phase regions. Comparative analysis with the binary subsystems highlights the restricted solubility of Yb 2 O 3 in MgO (1.61 wt%) and the associated asymmetry, which are rationalized by crystallographic constraints and defect energetics. This study fills a critical knowledge gap and provides essential phase equilibria data for designing advanced Yb‐silicate coatings with enhanced CMAS and corrosion resistance, as well as for developing MgO‐based refractory materials.

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Cite This Study

Li et al. (Fri,) studied this question.

synapsesocial.com/papers/6a080acea487c87a6a40cccd https://doi.org/https://doi.org/10.1111/jace.70838

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