The identification of a grain-boundary phase in hot-pressed silicon nitride by Auger electron spectroscopy
- 41 Downloads
The presence of magnesium, calcium and oxygen has been detected in the intergranular fracture surface of an Si3N4-7% MgO hot-pressed material by Auger electron spectroscopy, together with a chemical shift in the silicon Auger peak. The composition of this grain-boundary phase has been estimated as (0.40 ± 0.03) CaO. (0.75 ± 0.10) MgO. 2SiO2 by comparison with spectra obtained from a bulk glass specimen of similar composition. The reduction in strength of the hot-pressed material at temperatures above 1000° C has been attributed to the decrease in viscosity of this phase.
KeywordsSilicon Magnesium Chemical Shift Nitride Fracture Surface
Unable to display preview. Download preview PDF.
- 1.P. Drew and M. H. Lewis, J. Mater. Sci. 9 (1974) 261.Google Scholar
- 2.Ram Kossowsky, ibid 8 (1973) 1603.Google Scholar
- 3.J. C. Riviere, Cont. Phys. 14 (1973) 513.Google Scholar
- 4.H. G. Maguire and P. D. Augustus, J. Phys. C. 4 (1971) L174.Google Scholar
- 5.R. Heckingbottom and P. R. Wood, Surface Sci. 36 (1973) 594.Google Scholar
- 6.B. A. Joyce, ibid 35 (1973) 1.Google Scholar
- 7.S. Thomas, J. Appl. Phys. 45 (1974) 161.Google Scholar
- 8.E. M. Levin, C. R. Robbins and H. F. McMurdie, “Phase Diagrams for Ceramicists” (American Ceramic Society, Columbus, Ohio, 1964) p. 210.Google Scholar
- 9.F. F. Lange, Ann. Rev. Mat. Sci. (1974) in press.Google Scholar
- 10.E. T. Turkdogan and P. M. Bills, Amer. Ceram. Soc. Bull. 39 (1960) 682.Google Scholar
- 11.Y. Oyama and O. Kamigaito, Yogyo-Kyokai-Shi 81 (1973) 34.Google Scholar