Glass–ceramics of the Al and P-containing Na5SmSi4O12-type Na+-superionic conductors (N5SXPS) were prepared by crystallization of glasses with the composition Na3+3x−y+zSm1−xAlzPySi3−y−zO9, and the effects of X elements on the separation of the phase and the microstructural effects on the conduction properties of glass–ceramics were considered. The N5SXPS was obtained as a stable phase at high temperatures. The ionic conductivity was 0.67 x 10−1S/cm at 300C.

Na+-Superionic Conductors of Glass–Ceramics in the System, Na2O–Sm2O3–X2O3–P2O5–SiO2 (X = Al, Ga). T.Okura, H.Monma, K.Yamashita: Solid State Ionics, 2004, 172[1-4], 561-4

Table 145

Conductivity Parameters for Na8(Mg,Ti)5O14

 

Material

σ300C

σo (S/cm)

E (kJ/mol)

Na8.26Mg0.13Ti4.87O14

6 x 10-5

6 x 105

79

Na8.5Mg0.25Ti4.75O14

1.2 x 10-4

2.5 x 105

71.8

Na8.74Mg0.37Ti4.63O14

2.4 x 10-5

1.7 x 105

77.8

Na9Mg0.5Ti4.5O14

8 x 10-6

1.1 x 105

80.9

Na0.8Mg0.4Ti3.6O8

9 x 10-8

2 x 105

103

Na0.9Mg0.45Ti1.55O4

1.5 x 10-4

1 x 106

77.2

Na0.68Mg0.34Ti0.66O2

3 x 10-3

4.1 x 104

48

Na4.4Mg0.2Ti4.8O12

2.8 x 10-4

4.0 x 104

59.1

Na4.6Mg0.3Ti4.7O12

2.3 x 10-4

2.5 x 105

69

Na4MgTiO9

1.1 x 10-3

1.1 x 106

68.3