Clathrate compound and its preparation and use

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A clathrate compound of formula (I) : M8AxBy-x (I) wherein : M is an alkaline earth metal, a rare earth metal, an alkali metal, Cd, or a combination thereof, A is Ga, Al, In, Zn or a combination thereof; B is Ge, Si, Sn, Ni or a combination thereof; and 12≰x≰16, 40≰y≰43, x and y each is or is not an integer. Embodiments of the invention also include method of making and using the clathrate compound.