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Products and Services > Conductive ceramics

Conductive ceramics

 beta alumina tube  beta alumina conductive ceramics

Beta alumina

Ionotec manufactures ion-conductive ceramic membranes in various shapes and sizes. The conductive ceramic material is usually beta-alumina, a hard dense polycrystalline ceramic in which the mobile ion may be sodium (Na+), potassium (K+), silver (Ag+), lithium (Li+), strontium (Sr2+), barium(Ba2+) or gadolinium (Gd3+). Other types of conductive ceramic may be possible.  Most applications of beta-alumina ceramics require conductivity to sodium (Na+) or to potassium (K+).  For both types of conductive ceramic we can supply beta-alumina ceramics stabilized either with lithium or with magnesium, with or without zirconium oxide added as a strengthening agent. Ceramic membranes are available as thin-walled tubes, flat discs, or flat plates.

Dimensions

Beta-alumina tubes can be supplied fitted with insulating ceramic headers.  Prices are dependent on quantity, type and fittings.  Standard product dimensions are shown in the tables below; Ionotec's manufacturing process is quite flexible and adaptable to individual requirements.

Tubes, one end closed 

Part No. Length (mm) Internal diameter (mm) Wall thickness (mm)
A1 70 6.5 0.5-1.5
A2 105 13 0.5-1.5
H1 40 20 1-2
H3 80 20 1-2
B1 100 28 1-2
B2 220 29 1.5-2
R1 330 45 2
C2 220 52 2
C3 330 52 2

Flat discs and plates 

Part No. Diameter/length (mm) Thickness (mm)
D1 20 1
D2 45 1.5
D3 70 2

 Properties of beta alumina

Some properties of Ionotec ion-conductive beta-alumina ceramics are shown below.

Mobile ion Na+ K+ Li+ Sr2+, Ba2+
Porosity (%) 1-2 2-3 1-2 3-4
Bending strength (MPa) 250-350 200-300    

Thermal expansion coefficient (x 10-6) °C-1
     0-500°C
     500-1000°C

 

7.2
8.6

 

7.45
8.5

    

Resistivity (ohm m)
     25°C
     100°C
     200°C
     300°C
     400°C
     500°C
     600°C


6.0
0.6
0.1
0.042
0.026
0.023
0.020


12.5
2.5
0.4
0.18
0.091
0.059
0.040


190
14
1.6
0.58
0.33
0.23
0.18


67,000
20,000
3300
500
100
20
2.0
 
For further technical data, please see the links below or contact us.

 

Products and Services > Conductive ceramics

 

 

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