The phase diagram, and the conductivity of various compositions, were determined. It was noted that KBr was soluble in NaI to the extent of 20mol% at 30C, whereas the solubility of NaI in KBr was less than 10mol% at the same temperature. Complete solid solubility occurred only at temperatures of more than 400C. The maximum enhancement of the conductivity at 500C was represented by a factor of 500 with respect to pure KBr, or by a factor of 8 with respect to pure NaI (table 28). This maximum occurred at 70mol%NaI. The results were explained in terms of so-called lattice-loosening.

P.Manoravi, K.Shahi: Journal of the Physics and Chemistry of Solids, 1991, 52[3], 527-35

 

 

Table 28

Ionic Conduction Parameters for the KBr-NaI System

 

NaI (mol%)

Temperature (C)

σo (S/cm)

Q (eV)

0

595-720

9550

1.58

10

540-650

7590

1.43

20

480-595

1000

1.20

30

405-560

8320

1.29

40

400-540

3390

1.20

50

400-540

38000

1.34

60

330-522

110000

1.37

70

390-520

87000

1.31

80

410-527

85100

1.34

90

400-570

53700

1.35

100

445-615

28900

1.38