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