| CPC C01D 3/04 (2013.01) [C01P 2002/74 (2013.01); C01P 2002/86 (2013.01); C01P 2006/40 (2013.01)] | 17 Claims |

|
1. A compound having the formula Nau+yNw−yMyLa2Cl3−vXv, wherein
N is Ta, Nb, or a combination thereof;
M is Zr, Hf, or a combination thereof;
u is from 0.1 to 0.7;
when v is not zero, X is Br or I;
the sum (u+y)+5(w−y)+4y+3z is equal to 3;
v is less than or equal to 3;
w is from 0.04 to 0.40;
y is from zero to less than 0.4;
z is not zero; and
the sum of u+y is from 0.10 to 0.75.
|