Abstract
The ground state properties of Fe3−xCrxO4 (x = 0–3) compounds were studied using first principles calculation. Stress–strain methods were used to evaluate elastic constants of these compounds. These compounds are mechanically stable structures, because they satisfy the mechanical stability criteria. The mechanical moduli were estimated using the Voigt–Reuss–Hill approximation. The calculated bulk moduli of Fe3O4, Fe2CrO4, FeCr2O4, and Cr3O4 are 190.9 GPa, 135.5 GPa, 180.1 GPa, and 235.6 GPa, respectively. Both of anisotropic indexes and 3-D surface contour were used to illustrate the elastic anisotropy. Debye temperature and anisotropy of acoustic velocity of Fe3−xCrxO4 compounds were also investigated. The maximum Debye temperature is attributing to Cr3O4 with 507.6 K among Fe3−xCrxO4 compounds. The minimum thermal conductivity of Fe3−xCrxO4 compounds was estimated by both Clarke’s model and Cahill’s model. Moreover, 3-D surface contour of the anisotropic thermal conductivity of Fe3−xCrxO4 compounds was obtained based on the Clarke’s model and anisotropic Young’s modulus.
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ACKNOWLEDGMENTS
This work was supported by the Natural Science Foundation of Shaanxi Province of China (2013JQ6009), the 863 project in China (No. 2013AA031203), the Special Funds for Strategic Emerging Industries Core Technology Research of Guangdong Province in China (No. 2012A090100018), Postdoctoral Science Foundation funded project of China (No. 2014M552434), and Natural Science Foundation of China (51301131).
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Liu, Y., Xing, J., Li, Y. et al. Mechanical properties and anisotropy of thermal conductivity of Fe3−xCrxO4 (x = 0–3). Journal of Materials Research 31, 3805–3813 (2016). https://doi.org/10.1557/jmr.2016.425
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DOI: https://doi.org/10.1557/jmr.2016.425