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A High‐Pressure Polymorph of Phosphorus Oxonitride with the Coesite Structure
Author(s) -
Baumann Dominik,
Niklaus Robin,
Schnick Wolfgang
Publication year - 2015
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.201410526
Subject(s) - coesite , stishovite , hexacoordinate , phase (matter) , materials science , phosphorus , crystallography , phase diagram , diffraction , high pressure , mineralogy , chemistry , organic chemistry , thermodynamics , quartz , geology , optics , silicon , physics , eclogite , metallurgy , paleontology , subduction , tectonics
Abstract The chemical and physical properties of phosphorus oxonitride (PON) closely resemble those of silica, to which it is isosteric. A new high‐pressure phase of PON is reported herein. This polymorph, synthesized by using the multianvil technique, crystallizes in the coesite structure. This represents the first occurrence of this very dense network structure outside of SiO 2 . Phase‐pure coesite PON ( coe ‐PON) can be synthesized in bulk at pressures above 15 GPa. This compound was thoroughly characterized by means of powder X‐ray diffraction, DFT calculations, and FTIR and MAS NMR spectroscopy, as well as temperature‐dependent diffraction. These results represent a major step towards the exploration of the phase diagram of PON at very high pressures and the possibly synthesis of a stishovite‐type PON containing hexacoordinate phosphorus.