Highly Condensed and Super‐Incompressible Be₂PN₃

Although beryllium and its compounds show outstanding properties, owing to its toxic potential and extreme reaction conditions the chemistry of Be under high‐pressure conditions has only been investigated sparsely. Herein, we report on the highly condensed wurtzite‐type Be 2 PN 3 , which was synthesized from Be 3 N 2 and P 3 N 5 in a high‐pressure high‐temperature approach at 9 GPa and 1500 °C. It is the missing member in the row of formula type M 2 PN 3 ( M = Mg, Zn). The structure was elucidated by powder X‐ray diffraction (PXRD), revealing that Be 2 PN 3 is a double nitride, rather than a nitridophosphate. The structural model was further corroborated by 9 Be and 31 P solid‐state nuclear magnetic resonance (NMR) spectroscopy. We present 9 Be NMR data for tetrahedral nitride coordination for the first time. Infrared and energy‐dispersive X‐ray spectroscopy (FTIR and EDX), as well as temperature dependent PXRD complement the analytical characterization. Density functional theory (DFT) calculations reveal super‐incompressible behavior and the remarkable hardness of this low‐density material. The formation of Be 2 PN 3 through a high‐pressure high‐temperature approach expands the synthetic access to Be‐containing compounds and may open access to various multinary beryllium nitrides.