It was found that disordering of the PO4 tetrahedra, within the rigid [In2P3O12]33- skeleton of this superionic conductor, led to changes in the ionic conductivity, activation energy, and phase transition temperature. The disorder was varied by quenching the samples from various temperatures. A degree of disorder implied a high conductivity and a low activation energy (table 173).

S.E.Sigaryov, A.B.Vasiliev: Journal of the Physics and Chemistry of Solids, 1991, 52[3], 467-70

 

 

 

Table 173

Conductivity Parameters for Na3In2(PO4)3

 

Heat Treatment

Temperature (K)

o (S/cm)

E (eV)

slowly cooled from 1300K

335 - 500

51

0.41

slowly cooled from 1300K

505 - 650

16200

0.62

quenched from 1300K

290 - 325

21900

0.48

quenched from 1300K

335 - 500

76100

0.51

quenched from 1300K

505 - 650

11600

0.40

quenched from 1550K

290 - 325

1900

0.41

quenched from 1550K

335 - 500

336000

0.57

quenched from 1550K

505 - 650

6970

0.41