the first step of forming, on a joining surface of a base body of a metal oxide, a solution layer formed of {TAIL ~ a solution} in which a first compound containing aluminum and oxygen and a second compound containing boron and {HEAD ~ oxide} dissolve, 
the first step of forming , on a joining surface of a base body of a metal oxide , a solution layer formed of { TAIL ~ a solution } in which a first compound containing aluminum and oxygen and a second compound containing boron and { HEAD ~ oxide } dissolve ,
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH