Electrical conductivity, thermal expansion and reaction of (La, Sr)(Ca, Mg)O-3 and (La, Sr)AlO3 system

The electrical conduction, thermal expansion, chemical reaction, and textur e of a sintered body were measured for the mixture of (La, Sr)AlO3 and (La, Sr)(Ga, Mg)O-3, and on the Al-substituted (La, Sr)(Ga, Mg, Al)O-3. No enha ncement effect was observed with electrical conductivity by mixing or dopin g of the Al component. These systems showed lower electrical conductivity t han the proportional value of the components. It was considered that the di fference of thermal expansion stays at a tolerable level. The grain growth inhibition suggested the strengthening effect of mixing (La, Sr)AlO3, into (La, Sr)(Ga, Mg)O-3. From these results, it is expected that (La, Sr)AlO3 c an be used as an electrolyte-protective layer material in order to make a c o-fire process possible. In this co-fire, a thin (La, Sr)(Ga, Mg)O-3 electr olyte film will be protected by a very thin (La, Sr)AlO3 film and supported on a Ni-ceramic anode substrate tube or plate. Such a very thin electrolyt e will be effective for cost reduction by decreasing the use of Ga. (C) 200 0 Elsevier Science BN. All rights reserved.