RE-impurities(%)

La2O3                           0.011

Pr6O11                  25.01

Sm2O3             <0.010          

Gd2O3              <0.010

Dy2O3               <0.010

Er2O3                <0.010               Yb2O3               <0.010

Y2O3                            

CeO2                            0.037Nd2O3                         74.75

Eu2O3                       <0.010

Tb4O7                         <0.010 Ho2O3                       <0.010

Tm2O3                      <0.010

Lu2O3                       <0.010  REO                          98.67