| CPC C01B 25/14 (2013.01) [C30B 23/00 (2013.01); C30B 29/46 (2013.01); G01T 1/24 (2013.01); G01T 3/08 (2013.01)] | 18 Claims |

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1. A lithium-containing chalcophosphate compound having the formula LiMP2Q6, where M is Ga, In, Bi, Sb, As, or a combination thereof, and Q is S, Se, or a combination thereof.
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