Angewandte Chemie - International Edition
Angewandte Chemie - International Edition
2 years ago

Nitridic Analogs of Micas AESi3P4N10(NH)2 (AE = Mg, Mg0.94Ca0.06, Ca, Sr)

Lucien Eisenburger, Philipp Strobel, Peter J. Schmidt, Thomas Bräuniger, Jonathan Wright, Eleanor Lawrence Bright, Carlotta Giacobbe, Oliver Oeckler, Wolfgang Schnick
We present the first nitridic analogs of micas, namely AE Si 3 P 4 N 10 (NH) 2 ( AE = Mg, Mg 0.94 Ca 0.06 , Ca, Sr), which were synthesized under high-pressure high-temperature conditions at 1400 °C and 8 GPa from the refractory nitrides P 3 N 5 and Si 3 N 4 , the respective alkaline earth amides, implementing NH 4 F as a mineralizer. The crystal structure was elucidated by single-crystal diffraction with microfocused synchrotron radiation, energy-dispersive X-ray spectroscopic (EDX) mapping with atomic resolution, powder X-ray diffraction, and solid-state NMR. The structures consist of typical tetrahedra-octahedra-tetrahedra ( T - O - T ) layers with P occupying T and Si occupying O layers, realizing the rare motif of sixfold coordinated silicon atoms in nitrides. The presence of H, as an imide group forming the SiN 4 (NH) 2 octahedra, is confirmed by SCXRD, MAS-NMR, and IR spectroscopy. Eu 2+ doped samples show tunable narrow-band emission from deep blue to cyan (451 – 492 nm).

Publisher URL: https://onlinelibrary.wiley.com/doi/10.1002/anie.202114902

Open URL: https://onlinelibrary.wiley.com/doi/pdfdirect/10.1002/anie.202114902

DOI: 10.1002/anie.202114902

Open access
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