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Vogel, Sebastian ; Bykov, Maxim ; Bykova, Elena ; Wendl, Sebastian ; Kloß, Simon D. ; Pakhomova, Anna S. ; Dubrovinskaia, Natalia ; Dubrovinsky, Leonid ; Schnick, Wolfgang:
Nitride Spinel : An Ultraincompressible High-Pressure Form of BeP₂N₄.
In: Angewandte Chemie International Edition.
Bd. 59
(2020)
Heft 7
.
- S. 2730-2734.
ISSN 1521-3773
DOI: https://doi.org/10.1002/anie.201910998
Abstract
Owing to its outstanding elastic properties, the nitride spinel γ-Si3N4 is of considered interest for materials scientists and chemists. DFT calculations suggest that Si3N4-analog beryllium phosphorus nitride BeP2N4 adopts the spinel structure at elevated pressures as well and shows outstanding elastic properties. Herein, we investigate phenakite-type BeP2N4 by single-crystal synchrotron X-ray diffraction and report the phase transition into the spinel-type phase at 47 GPa and 1800 K in a laser-heated diamond anvil cell. The structure of spinel-type BeP2N4 was refined from pressure-dependent in situ synchrotron powder X-ray diffraction measurements down to ambient pressure, which proves spinel-type BeP2N4 a quenchable and metastable phase at ambient conditions. Its isothermal bulk modulus was determined to 325(8) GPa from equation of state, which indicates that spinel-type BeP2N4 is an ultraincompressible material.