Bulletin of the Chemical Society of Japan
Online ISSN : 1348-0634
Print ISSN : 0009-2673
ISSN-L : 0009-2673
The Heat of Formation and the Specific Heat of Silicon Nitride
Shun-ichi Satoh
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1938 Volume 13 Issue 1 Pages 41-48

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Abstract

As the specific heat of silicon nitride has not yet been determined, the mean specific heat of silicon nitride was measured by the ice calorimeter over three temperature intervals: 0–99.5, 0–316.4, and 0–585°C., and the equation of the true specific heat was obtained which holds good over the above temperature ranges:
C=0.1656+1.847×10^-4t-4.5×10^-8t^2.
By using this value, the heat of formation of silicon nitride was computed from the dissociation pressure of silicon nitride at high temperatures. The result obtained is as follows:
3Si+2N_2=Si_3N_4+163,000.
The relationship between the heats of formation of nitrides of the elements belonging to the second series of the periodic table and their atomic numbers is discussed.

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