The results show that all kinds of yttrium aluminates such as YALO_3,Y_4Al_2O_9 and Y_3Al_5O_(12), appear in the grain boundaries, and B_2O-3 can dissolve in yttrium aluminates.

• 结果表明，晶界处存在YAlO_3，Y_4Al_2O_9及Y_3Al_5O_（12）等各种铝酸钇结晶物，B_2O_3可固溶到铝酸钇中形成固溶体。