Hostname: page-component-78c5997874-mlc7c Total loading time: 0 Render date: 2024-11-02T23:20:06.207Z Has data issue: false hasContentIssue false
  • English
  • Français

New Covalent Ceramics: MgSiN2

Published online by Cambridge University Press:  22 February 2011

Wilhelm A. Groen ,
Marcel J. Kraan ,
Gijsbertus de With  and
Mathias P.A Viegers
Marcel J. Kraan
Affiliation:
Philips Research Laboratories, P.O. Box 80000, 5600 JA, Eindhoven, the Netherlands
Gijsbertus de With
Affiliation:
Also affiliated with the Eindhoven University of Technology, Eindhoven, the Netherlands
Mathias P.A Viegers
Affiliation:
Philips Research Laboratories, P.O. Box 80000, 5600 JA, Eindhoven, the Netherlands
Get access

Abstract

The ternary nitride MgSiN2 crystallizes in a diamond-like structure with a band gap of 4.8 eV. These characteristics make the compound promising for a variety of applications. Recently we succeeded in preparing fully dense ceramics by sintering at 1550°C. Phase composition, chemical properties and the mechanical properties of the as-prepared ceramics are described. The ceramics are resistant to oxidation in air at least up to 920°C. The thermal conductivity at room temperature has been found to be 20 W/m·K. A considerable improvement of the thermal conductivity is expected when improved processing conditions, well within reach, are realized. A reasonable strength of 270 MPa and a fairly good fracture toughness of about 4.3 MPa·m½ are obtained. A hardness of about 15 GPa and a Young's modulus of 235 GPa have been measured. These new ceramics show that it is still possible to find improved materials as compared to the usual oxide and non-oxide ceramics.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 327: Symposium N – Covalent Ceramics II: Non-Oxides , 1993 , 239
Copyright
Copyright © Materials Research Society 1994

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

1. Slack, G.A., J. Phys. Chem. Solids 34, 321 (1973).Google Scholar
2. David, J., Laurent, Y. and Lang, J., Bull. Soc. Fr. Mineral. Cristallogr. 93, 153 (1970).Google Scholar
3. Harris, R.K., Leach, M.J. and Thompson, D.P., Chem. Mater. 4, 260 (1992).Google Scholar
4. Gaido, G.K., Dubrovskii, G.P. and Zykov, A.M., Izv. Akad. Nauk. SSSR, Neorg. Mater. 10, 564 (1974).Google Scholar
5. Sanderson, R.T., J. Chem. Educ. 44, 516 (1967).Google Scholar
6. With, G. de and Groen, W.A., in preperation.Google Scholar
7. Groen, W.A., Kraan, M.J. and With, G. de, J. Eur. Ceram. Soc. 12, 413 (1993).Google Scholar
8. Hintzen, H., Groen, W.A., Swaanen, P., Kraan, M.J. and Metselaar, R., submitted to J. Mater. Sci. Lett. 1993.Google Scholar
9. Söllter, W. and Güther, H.-M., Produktion und Priiftechnik 11, 106 (1991).Google Scholar
10. Harris, J.H., Youngman, R.A. and Teller, R.G., J. Mater. Res. 5, 1763 (1990).Google Scholar
11. Kostler, C., Gtither, H.-M., Bestgen, H., Roosen, A. and Böcker, W., Proc. 2nd Eur. Conf. Adv. Mater. Processes, Inst. of Mater., London, U.K., Vol. 3, 29 (1991).Google Scholar