| CPC C30B 29/22 (2013.01) [C01B 33/20 (2013.01); C30B 15/02 (2013.01); C01F 17/00 (2013.01); C01P 2002/52 (2013.01)] | 14 Claims |

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1. A crystal, a formula of the crystal being (A1-bBb)3(P1-qQq)5O12, wherein:
A consists of at least one of Gd, Lu, La, Yb, Sc, or Y;
B consists of at least one of Na, K, V, Mn, Fe, Co, Ni, Ti, Ge, Zr, or Hf;
P consists of at least one of Al, Ga, In, or Sc;
Q consists of Al;
b=0.2˜0.9; and
q=0˜1.
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