RbBSi forms under high-pressure, high-temperature conditions at = 8 GPa and = 1273 K. The new compound (space group 3̅, = 9.9583(1) Å) is the second example for a clathrate-I borosilicide. The phase is inert against strong acids and bases and thermally stable up to 1300 K at ambient pressure. (Rb)(B)(Si) is electronically balanced, diamagnetic, and shows semiconducting behavior with moderate Seebeck coefficient below 300 K. Chemical bonding analysis by the electron localizability approach confirms the description of RbBSi as Zintl phase.
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