Fn 1: Ti © ml 
fo) 
© 
Ce 
60 + By 
ee 
so) ee 
5 _ Es ire 
et e@ 
| 
aT 
5 
2 
vS > 
ry ‚8 
JE 
& 
zj a + = 
10, 
w 
ij 20 30 40 so 60 70 T 380 
Fig. 4. 
been derived for C, is made difficult by the fact that the difference 
(Cis not known for solid nitrogen. 
If this difference is taken from the relation given by Nernst and 
LINDEMANN ‘): 
; ap 
C, —C,=A, ri Cen 
and if for 4, the value 0,021 is chosen as found for monatomic 
metals and for salts which behave as if they were monatomic, the 
following values for C,—C are found: 
Sl 21 40 62 
OC, = 0,01 0,04 0,29 0,50° 
If these values for C,,—C, are taken it appears that *) C, deviates 
from DeBuw’s formula in the same sense as sulphur and graphite. 
This would lead to the conclusion that the specifie heat of nitrogen 
in the solid state does not change like that of the monatomic solid 
substances mentioned above. But then the basis for the calculation 
of C,—C,°*) breaks down. 
1) W. Nernst and F. A. Linpemany. ZS f. Elektrochem. 17 (1911), p. 817. 
*) For both parts ef the curve, which relate to the two modifications (p. 1251 note 4). 
5) That for solid elements which are’ not monatomic a different value of Ag 
may occur in the formula of Nernst and Linnemann, becomes apparent if Cy—Cy 
is calculated for sulphur and for phosphorus at 20° C. from the compressibility 
according to Ricuarps, J. Amer. Chem. Soc. 37 (1915), p. 1644, and from the 
coefficient of expansion (comp. also Rickarps Le). From these data follows (for 
20° CG): for sulphur (ehombie): Ag = 9.012, for phosphorus (white): Ag = 0.026. 
81% 
