Abstract: A composite object comprises two components (2a, 2b) made of an oxidic material which is ion conductive at an elevated temperature, said components being joined to each other in a medium-tight manner by way of a solder bridge (4) in a connection zone (6) located therebetween. In order to form a reliable connection, it is proposed that the solder bridge is formed by a low-melting tin alloy that has a weight proportion of at least 65%w tin and a melting point of maximally 350° C. and comprises at least one activating metal as an alloying constituent.