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Elastic and Mechanical Investigation of Rare Earth Monochalcogenides Under High Pressure


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DOI: https://doi.org/10.15866/ireme.v14i11.20364

Abstract


Rare-earth Europium monochalcogenides EuX (X=O, Se, S, Te) are distinguished with their outstanding features that are essential for cancer treatment, biomedical and engineering applications. Therefore, further insights on the mechanical properties will enhance the performance of these materials. The elastic stiffness constants can provide an in-depth understanding of the mechanical behavior since it can be correlated to many fundamental material properties. The anisotropic elastic stiffness constants are divided into three independent terms through continuum mechanics and the orthonormal decomposition procedure and new expressions are presented for the first time in literature for some mechanical parameters based on elastic stiffness coefficients. As an outstanding outcome of the current decomposition tool, there is a straight relationship connecting macroscopic to microscopic properties for a certain engineering material. This approach is used to estimate the overall stiffness, the resistance to volume and the shape change in terms of Bulk and shear moduli for these compounds, respectively. The influence of high pressure on these mechanical and elastic properties and the elastic anisotropy for rare-earth chalcogenides are investigated. Since very few studies have attempted to estimate the degree of anisotropy for such compounds, the effect of the combination of the three elastic constants under high pressure on the degree of anisotropy is shown, in which it could work as a platform to select a material with specific values for elastic constants based on the effect of anisotropy in cubic systems.
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Keywords


High Pressure; Mechanical Properties; Anisotropy; Europium Monochalcogenides

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References


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