360 PROPERTIES OF ELECTRICALLY CONDUCTING SYSTEMS 



the sodium ion which alone is capable of motion in these crystals. The 

 process of conduction appears to be entirely similar to that in glasses. 

 The typical salts, below their melting point, conduct the current, in 

 some cases, with extreme facility. As a rule, the conductance increases 

 with increasing temperature according to an exponential curve. The 

 specific conductance may be expressed fairly well as a function of tem- 

 perature by means of the equation: 



(132) 



log [i = a + bt, 



where a and b are constants. In the following table are given values of 

 the specific conductance of a few salts at temperatures through their 

 melting points. 18 



TABLE CXLIV. 



CONDUCTANCE OF SALTS THROUGH THE MELTING POINT. 



T1C1 



AgCl 



AgBr 



200 



240 



280 



350 



400 



419 



422 



425 



500 



600 



0.00052 



0.0023 



0.0091 



0.08 



0.38 



0.51 



M.P. 



2.76 



2.92 



3.08 



t 



250 



300 



350 



400 



450 



455 



456 



500 



600 



t 



125 

 140 



144.6 



150 

 250 

 350 

 450 

 550 

 552 

 554 

 600 

 650 



Agl 



0.00030 



0.0015 



0.0065 



0.026 



0.11 



M.P. 

 3.76 

 3.91 

 4.16 



0.00011 



0.00026 

 (0.00034 

 (1.31 



1.33 



1.78 



2.14 



2.41 



2.64 



M.P. 



2.36 



2.43 



2.47 



11 Tubandt and Lorenz, Ztschr. f. phys. Chem. 87, 513 (1914). 



