Microstructural features of the ??? transformation in silicon nitride at high pressures and temperatures

Danilenko, N. V.; Oleinik, G. S.; Dobrovol'skii, V. D.; Britun, V. F.; Semenenko, N. P.

doi:10.1007/bf00797765

Cited by 12 publications

(10 citation statements)

References 11 publications

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“…Above 4001C, a-Si 3 N 4 starts yielding and the strain drops rapidly with further heating to 12341C. It is essential to point out here that a-b-Si 3 N 4 transformation is an important issue at high pressure/high temperature conditions, [19][20][21] and there is no apparent a-b-Si 3 N 4 transformation in our experiment up to 8.4 GPa and 12341C. The grain size of a-Si 3 N 4 remains around 20 nm upon heating all the way to 10001C, above which there is a fast grain growth.…”

Section: Resultsmentioning

confidence: 90%

“…13,14 Four polymorphs of Si 3 N 4 have been reported so far, including two hexagonal phases (a-and b-Si 3 N 4 ), a cubic spinel structure (c-Si 3 N 4 ), and another still-ambiguous phase (d-Si 3 N 4 ). 10 Extensive work has been performed in studying the mechanical properties, [15][16][17][18] phase transition, [19][20][21] and equation of state 22 of Si 3 N 4 . However, one of the fundamental parameters of Si 3 N 4 -the yield strength at high pressure/high temperature conditions-is still lacking.…”

Section: Introductionmentioning

confidence: 99%

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Yield Strength of α‐Silicon Nitride at High Pressure and High Temperature

Qian

Pantea

Zhang

et al. 2005

Journal of the American Ceramic Society

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Through the analysis of peak broadening of energy‐dispersive diffraction lines from a powdered sample, the yield strength of α‐Si3N4 was investigated at a pressure of 9 GPa and temperatures up to 1234°C. During compression at room temperature, the lattice strain deduced from peak broadening increased linearly with pressure up to 9.2 GPa, with no clear indication of strain saturation. While heating at 9 GPa, diffraction peaks narrowed and significant stress relaxation was observed at temperatures above 400°C, indicating the onset of yielding. The yield strength of α‐Si3N4 decreases rapidly with increasing temperature: from 8.7 GPa at 400°C to 4.0 GPa at 1234°C. The low temperature for the onset of yielding and decrease of yield strength upon further heating bring up concern regarding the performance of α‐Si3N4 as an engineering material. Finally, the grain size variation is also outlined together with the dependence of differential strain on pressure and on temperature. This provides crucial information for clarifying the “fine structure” of the evolution of the differential strain.

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Section: Resultsmentioning

confidence: 90%

Section: Introductionmentioning

confidence: 99%

Yield Strength of α‐Silicon Nitride at High Pressure and High Temperature

Qian

Pantea

Zhang

et al. 2005

Journal of the American Ceramic Society

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“…There are several Si 3 N 4 polymorphs, namely α phase (space group: P 3 1 c) [4], β phase (space group: P 6 3 /m) [4], willemite-II phase (wII-Si 3 N 4 , space group: I43d) [5], γ phase (space group: F d3m) [6], δ phase (space group: P 3) [7], and post-spinel phase (space group: BBMM) [8]. In recent years, the α→β [9,10], β→wII [5], β→γ [7, 11−13], α→γ [7], β→δ [7], and γ→post-spinel [8,14] phase transitions have been carefully investigated.…”

Section: Introductionmentioning

confidence: 99%

Theoretical Study on the High-Temperature P6̄ and P6̄′ Phases of Si3N4: A Tool to Aid in Ceramics Development

Chen

2014

Chinese Journal of Chemical Physics

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Atomistic modeling based on the density functional theory combined with the quasi-harmonic approximation is used to investigate the lattice parameters and elastic moduli of the P6 and P6 phases of Si 3 N 4. β-Si 3 N 4 is set as a benchmark system since accurate experiments are available. The calculated lattice constants and elastic constants of β-Si 3 N 4 are in good agreement with the experimental data. The crystal anisotropy, mechanical stability, and brittle behavior of P6-and P6-Si 3 N 4 are also discussed in the pressure range of 30−55 GPa. The results show that these two polymorphs are metallic compounds. The brittleness and elastic anisotropy increase with applied pressure increasing. Besides, the phase boundaries of the β→P6 →δ transitions are also analysed. The β phase is predicted to undergo a phase transition to the P6 phase at 40.0 GPa and 300 K. Upon further compression, the P6 →δ transition can be observed at 53.2 GPa. The thermal and pressure effects on the heat capacity, cell volume and bulk modulus are also determined. Some interesting features are found at high temperatures.

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“…Related experimental work has been performed in studying the mechanical properties [2][3][4][5] and phase transition [6][7][8] of Si 3 N 4 . A few works on tensile tests appeared in the literature on silicon nitride at high temperature.…”

Section: Introductionmentioning

confidence: 99%

Molecular dynamics investigation of temperature dependent structural and fracture properties of amorphous silicon nitride

Liao

Wang

Zhang

2011

Materials Science and Technology

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Silicon nitride presents good mechanical properties and thermal stability at high temperature. As the experiments have limitations in the micro-/nanoscale characterisation of structural and fracture properties at high temperatures, atomistic simulation is the proper way to investigate the mechanism of this unique feature. In the present paper, the structural and fracture properties of amorphous silicon nitride (a-Si3N4) were studied at temperatures up to 1500 K. The simulation results consist of experiments on radial distribution function, temperature dependent yield stress and Young's modulus. Based on the structural and mechanical results of α-Si3N4 at different temperatures, the structure–property correlations were discussed.

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Microstructural features of the ??? transformation in silicon nitride at high pressures and temperatures

Cited by 12 publications

References 11 publications

Yield Strength of α‐Silicon Nitride at High Pressure and High Temperature

Yield Strength of α‐Silicon Nitride at High Pressure and High Temperature

Theoretical Study on the High-Temperature P6̄ and P6̄′ Phases of Si3N4: A Tool to Aid in Ceramics Development

Molecular dynamics investigation of temperature dependent structural and fracture properties of amorphous silicon nitride

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