Solid solutions of the form, Cu2-xAgxHgI4, were characterized by using differential scanning calorimetry and electrical conductivity techniques. Tetragonal phases were found over the entire range, apart for x-values of between 1.14 and 1.30; where a single cubic phase existed. It was found that the conductivity increased by 2 orders of magnitude at the transition temperature. The composition with x = 1.14 exhibited the highest room-temperature conductivity (table 257).

A.M.Sukeshini, K.Hariharan: Solid State Communications, 1991, 78[2], 85-7

 

 

Table 257

Room-Temperature Conductivity of Cu2AgHgI4

 

x

Temperature (K)

σ (S/cm)

Q (eV)

0

303

3.0 x 10-8

0.64

0

333

2.1 x 10-6

0.64

0.2

303

6.0 x 10-8

0.61

0.2

333

2.7 x 10-6

0.61

0.6

303

1.7 x 10-6

0.52

0.6

333

2.0 x 10-4

0.52

0.8

303

1.8 x 10-6

0.50

0.8

333

2.2 x 10-4

0.50

1.0

303

3.1 x 10-6

0.47

1.0

333

4.7 x 10-4

0.47

1.14

303

1.8 x 10-5

0.47

1.14

333

9.9 x 10-4

0.47

1.3

303

1.47 x 10-5

0.47

1.3

333

1.35 x 10-3

0.47

1.4

303

6.6 x 10-6

0.44

1.4

333

1.03 x 10-3

0.44

1.6

303

6.2 x 10-6

0.45

1.6

333

1.38 x 10-3

0.45

1.8

303

2.2 x 10-6

0.41

1.8

333

1.38 x 10-3

0.41

2.0

303

6.5 x 10-6

0.39

2.0

333

1.26 x 10-3

0.39