The temperature dependence of the conductivity was studied for samples with the natural isotope composition or for samples which were enriched with 6Li. An    phase transition was observed at 450 to 495K, and a  transition was observed at 495 to 530K. It was found that the substitution of 6Li for 7Li almost doubled the Li+ ion transport activation energy (table 172). This behavior was compared with the mixed-alkali effect.

S.E.Sigaryov: Solid State Communications, 1990, 75[12], 1005-7

 

 

 

Table 172

Ionic Conductivity Parameters for Li3Sc2(PO4)3

 

Isotope

Temperature (K)

o (SK/cm)

E (eV)

6Li

290 - 450

4.01 x 106

0.86

6Li

455 - 495

8.27 x 1010

1.23

6Li

539 - 700

4.39 x 106

0.69

7Li

290 - 450

2.49 x 105

0.75

7Li

455 - 495

2.58 x 1012

1.35

7Li

590 - 700

8.77 x 103

0.37