Compressibility and structural stability of ultra-incompressible bimetallic interstitial carbides and nitrides
D. Errandonea, J. Ruiz-Fuertes, J. A. Sans, D. Santamaria-Perez, O., Gomis, A. Gomez, and F. Sapina
TL;DR
This study investigates the high-pressure structural stability and compressibility of certain ultra-incompressible bimetallic interstitial carbides and nitrides, revealing their stability up to 48 GPa and their exceptional bulk moduli.
Contribution
It provides the first high-pressure x-ray diffraction data on these materials, demonstrating their ultra-incompressibility and stability, and compares their properties with other refractory materials.
Findings
Remain stable up to 48 GPa
Bulk modulus exceeds 330 GPa
Higher carbon content reduces compressibility
Abstract
We have investigated by means of high-pressure x-ray diffraction the structural stability of Pd2Mo3N, Ni2Mo3C0.52N0.48, Co3Mo3C0.62N0.38, and Fe3Mo3C. We have found that they remain stable in their ambient-pressure cubic phase at least up to 48 GPa. All of them have a bulk modulus larger than 330 GPa, being the least compressible material Fe3Mo3C, B0 = 374(3) GPa. In addition, apparently a reduction of compressibility is detected as the carbon content increased. The equation of state for each material is determined. A comparison with other refractory materials indicates that interstitial nitrides and carbides behave as ultra-incompressible materials.
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