Elastic properties of transition metal dioxides: XO$_{2}$(X=Ru, Rh, Os, Ir)

TL;DR

This study uses first-principles calculations to analyze the elastic properties of rutile transition metal dioxides XO$_{2}$ (X=Ru, Rh, Os, Ir), revealing their incompressibility and mechanical characteristics.

Contribution

It provides detailed elastic property data for XO$_{2}$ compounds using density functional theory, highlighting differences among the materials.

Findings

OsO$_2$ and IrO$_2$ are strongly incompressible

The compounds are not superhard solids

Debye temperatures are comparable to transition metal dinitrides

Abstract

The elastic properties of rutile transition metal dioxides XO$_{2}$ (X=Ru, Rh, Os, and Ir) are investigated using first-principles calculations based on density functional theory. Elastic constants, bulk modulus, shear modulus, and Young's modulus as well as Possion ratio are given. OsO$_2$ and IrO$_2$ show strong incompressibility. The hardness estimated for these dioxides shows that they are not superhard solids. The obtained Debye temperatures are comparative to those of transition metal dinitrides or diborides.