Abstract
Intensive calculations have been carried out to study the structural, mechanical, and thermal properties of β-Si3N4 with hexagonal P63/m structure. The calculated lattice constants a and c are in agreement with the available experimental data and similar theoretical calculations. Through a series of researches, the mechanical parameters (the elastic constants, bulk modulus, shear modulus, and Young’s modulus) and Debye temperature, the wave velocities are systematically investigated. Additionally, the mechanical anisotropy has been characterized by calculating Young’s modulus and described by the three-dimensional (3D) surface constructions and its projections. By using the born stability criteria and phonon frequency, it is concluded that the β-Si3N4 is stable mechanically and dynamically up to 35 GPa. Finally, the thermal properties have been calculated by employing the quasi-harmonic Debye model at different temperatures (0–800 K) and pressures (0–35 GPa).
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Acknowledgments
This project was supported by the Natural Science Foundation of China (Grant nos. 51402251 and 51502259). This work was sponsored by the Natural Science Foundation of Jiangsu Province of China (BK20130428). This work was supported by the joint research fund between Collaborative Innovation Center for Ecological Building Materials and Environmental Protection Equipments and Key Laboratory for Advanced Technology in Environmental Protection of Jiangsu Province (GX2015305). Natural Science Foundation of the Higher Education Institutions of Jiangsu Province (Grant No. 14KJD430003). This work was supported by the science and technology project from Ministry of Housing and Urban-Rural Development of the People’s Republic of China (2015-K4-007). This work was supported by Top-notch Academic Programs Project of JiangSu Higher Education Institutions, TAPP (Grant nos. PPZY2015A025).
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Hou, H.J., Zhu, H.J., Lao, C.W. et al. Structural, Mechanical, and Thermal Properties of β-Si3N4 under High Pressure. Braz J Phys 46, 393–398 (2016). https://doi.org/10.1007/s13538-016-0421-8
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DOI: https://doi.org/10.1007/s13538-016-0421-8