Structural, Mechanical, and Thermal Properties of β-Si3N4 under High Pressure

Hou, Haijun; Zhu, Hua; Lao, Carmen; Li, S. P.; Guan, Hao; Xie, Lin‐Hua

doi:10.1007/s13538-016-0421-8

Cited by 2 publications

(1 citation statement)

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“…Previous studies reported the calculated elastic constants C i j (GPa) of β -Si 3 N 4 under pressures up to 35.0 GPa (Table 3). [34] In our work, the anisotropic compressibility of the a-axis and c-axis is not obvious in the low pressure section. With increasing pressure, the anisotropic property of β -Si 3 N 4 becomes more and more distinct (Fig.…”

Section: Resultsmentioning

confidence: 57%

Compression behavior and phase transition of β -Si ₃ N ₄ under high pressure

et al. 2018

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The compressibility and pressure-induced phase transition of β -Si 3 N 4 were investigated by using an angle dispersive x-ray diffraction technique in a diamond anvil cell at room temperature. Rietveld refinements of the x-ray powder diffraction data verified that the hexagonal structure (with space group P63/m, Z = 2 formulas per unit cell) β -Si 3 N 4 remained stable under high pressure up to 37 GPa. Upon increasing pressure, β -Si 3 N 4 transformed to δ -Si 3 N 4 at about 41 GPa. The initial β -Si 3 N 4 was recovered as the pressure was released to ambient pressure, implying that the observed pressureinduced phase transformation was reversible. The pressure-volume data of β -Si 3 N 4 was fitted by the third-order Birch-Murnaghan equation of state, which yielded a bulk modulus K 0 = 273(2) GPa with its pressure derivative K 0 = 4 (fixed) and K 0 = 278(2) GPa with K 0 = 5. Furthermore, the compressibility of the unit cell axes (a and c-axes) for the β -Si 3 N 4 demonstrated an anisotropic property with increasing pressure.

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Section: Resultsmentioning

confidence: 57%