ionotec

Conductive Ceramics

Beta-alumina products and other ion-conductive ceramics

Ionotec manufactures ion-conductive ceramics tailored to individual application requirements. These products are mostly based on beta"-alumina, a hard polycrystalline ceramic in which the mobile ion may be Na+, K+, Ag+, Pb2+, Sr2+ or Ba2+. For other types of ceramic e.g. H+ and Li+ conductors, oxygen ion conductors and electronically conductive ceramics we may be able to help depending on the application; please ask for advice.

Most applications of beta"-alumina ceramics are concerned with conductivity to Na+ or to K+. For both types we can supply beta"-alumina ceramics stabilized either with Li or with Mg, with or without zirconium oxide added as a strengthening agent. Ceramic membranes are available in the form of thin-walled tubes, flat discs or plates.

Dimensions

Tubes can be supplied fitted with insulating ceramic headers, and in turn bonded to a metallic component if desired. Prices are dependent on quantity, type and fittings.

The dimensions of standard products are shown in the table below; Ionotec's manufacturing process can however be adapted to customers' 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
B1	100	28	1-2
B2	220	29	1.5-2
C2	220	52	2

Flat discs and plates

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

Properties

Some properties of Ionotec ion-conductive ceramics are shown in the following table. For further technical data, please contact us.

Downloadable data sheets in PDF format:

Mobile ion Na+ K+ Ag+ H+ Sr2+, Ba2+

Porosity % 1-2 2-3 1-2 2-3 3-4

Bending strength, MPa 250-350 200-300 - - -

Thermal expansion coefficient, x 10^-6
0-500ºC
500-1000ºC

7.2
8.6

7.45
8.5
-
-
-

Conductivity,(ohm m)^-1
25°C
100°C
200°C
300°C
400°C
500°C
600°C
0.2
1.2
9.2
24
38
43
49
0.08
0.4
2.6
5.4
11
17
25
0.013
0.07
0.48
2.3
6.7
-
-
0.00001
0.00005
0.0005
0.01
-
-
-
0.000015
0.00005
0.0003
0.002
0.01
0.05
0.5

Mobile ion	Na+	K+	Ag+	H+	Sr2+, Ba2+
Porosity %	1-2	2-3	1-2	2-3	3-4
Bending strength, MPa	250-350	200-300	-	-	-
Thermal expansion coefficient, x 10^-6 0-500ºC 500-1000ºC	7.2 8.6	7.45 8.5	-	-	-
Conductivity,(ohm m)^-1 25°C 100°C 200°C 300°C 400°C 500°C 600°C	0.2 1.2 9.2 24 38 43 49	0.08 0.4 2.6 5.4 11 17 25	0.013 0.07 0.48 2.3 6.7 - -	0.00001 0.00005 0.0005 0.01 - - -	0.000015 0.00005 0.0003 0.002 0.01 0.05 0.5

Back to the top