Properties of Cubic Si3N4 Obtained by Shock Synthesis


Article Preview

The cubic γ-Si3N4 phase was synthesized by the shock technique from the hexagonal β-Si3N4 phase. The thermal stability of the γ-Si3N4 was investigated during heating in vacuum up to 1773 K. An exothermal heat effect was found at 1690 K and structural investigations revealed complete transformation of γ-Si3N4 to β-Si3N4. Corresponding heat effect value was estimated as 51.3±7.7 KJ/mol. The high-pressure-high-temperature treatment (P=13 GPa, T=1300-2300 K) was applied to γ-Si3N4 to make bulk polycrystalline non-porous samples. It was found that temperatures below 1623 K do not change content of the cubic γ-Si3N4 while temperatures above 2273 K decrease it substantially. Mechanical properties of these bulk samples were measured by acoustic wave and nanoindentation techniques. The maximum values belong to cubic γ-Si3N4: hardness 39-44 GPa, Young’s modulus 475 Gpa and bulk modulus 263 GPa. Equilibrium γ-β line position in P-T phase diagram was estimated by using data obtained in this work. The equilibrium pressure at T=300 K was estimated as P300=7.0±2.0 GPa.



Edited by:

S. Itoh and K. Hokamoto




V.D. Blank et al., "Properties of Cubic Si3N4 Obtained by Shock Synthesis", Materials Science Forum, Vol. 566, pp. 129-134, 2008

Online since:

November 2007




[1] A. Zerr, G. Miehe, G. Serghiou, M. Schwarz, E. Kroke, R. Riedel, H. Fuess, P. Kroll, R. Boehler, Nature 400 (1999) 340.


[2] A. Zerr, M. Schwarz, R. Schmechel, R. Kolb, H. von Seggern, R. Riedel, Acta Cryst. A58 (Supplement) (2002) C47.

[3] T. Sekine, Hongliang He, T. Kobayashi, Ming Zhang, Fangfanf Xu, Appl. Phys. Lett. 76 (2000) 3706.

[4] Hongliang He, T. Sekine, T. Kobayashi, H. Hirosaki, Phys. Rev. 62 (2000) 11412.

[5] E. Kroke, M. Schwarz, Coordination Chemistry Reviews 248 (2004) 493.

[6] A.S. Yunoshev, Fizika Goreniya i Vzriva, 3, (2004), 132.

[7] A.S. Yunoshev, V.V. Silvestrov, A.A. Kalinin, and Yu.N. Pal'yanov, in: AIP Conf. Proc. 845, (2006), 1173.

[8] V.M. Prokhorov, V.D. Blank, S.G. Buga, V.M. Levin, Synthetic Metals 103 (1999) 2439.

[9] V. Blank, M. Popov, N. Lvova, K. Gogolinsky, V. Reshetov, J. Mater. Res. 12 (1997) 3109.

[10] A.S. Useinov, Instruments and Experimental Techniques 47 (2004) 119.

[11] J.Z. Jiang, F. Krag, D.J. Frost, K. Stahl and H. Lindelov: J. Phys. Condens Matter 13 (2001) 515.

[12] T. Sekine and T. Mitsuhashi, Appl. Phys. Lett. 79 (2001) 2719.

[13] V.D. Blank, Yu.S. Konyayev, B.M. Mogutnov, E.I. Estrin, The Physics of Metals and Metallography (USSR) 53 (1982) 402.