%0 Journal Article
%A Gollé-Leidreiter, Philipp
%A Bhat, Shrikant
%A Wiehl, Leonore
%A Wen, Qingbo
%A Kroll, Peter
%A Ishikawa, Ryo
%A Etter, Martin
%A Farla, Robert
%A Ikuhara, Yuichi
%A Riedel, Ralf
%A Kolb, Ute
%T Crystal structures of two new high-pressure oxynitrides with composition SnGe<sub>4</sub>N<sub>4</sub>O<sub>4</sub>, from single-crystal electron diffraction
%J Acta crystallographica / Section B
%V 80
%N 3
%@ 2052-5206
%C Oxford [u.a.]
%I Wiley-Blackwell
%M PUBDB-2024-01708
%P 182-192
%D 2024
%X SnGe<sub>4</sub>N<sub>4</sub>O<sub>4</sub> was synthesized at high pressure (16 and 20 GPa) and high temperature (1200 and 1500°C) in a large-volume press. Powder X-ray diffraction experiments using synchrotron radiation indicate that the derived samples are mixtures of known and unknown phases. However, the powder X-ray diffraction patterns are not sufficient for structural characterization. Transmission electron microscopy studies reveal crystals of several hundreds of nanometres in size with different chemical composition. Among them, crystals of a previously unknown phase with stoichiometry SnGe<sub>4</sub>N<sub>4</sub>O<sub>4</sub> were detected and investigated using automated diffraction tomography (ADT), a three-dimensional electron diffraction method. Via ADT, the crystal structure could be determined from single nanocrystals in space group P63mc, exhibiting a nolanite-type structure. This was confirmed by density functional theory calculations and atomic resolution scanning transmission electron microscopy images. In one of the syntheses runs a rhombohedral 6R polytype of SnGe<sub>4</sub>N<sub>4</sub>O<sub>4</sub> could be found together with the nolanite-type SnGe<sub>4</sub>N<sub>4</sub>O<sub>4</sub>. The structure of this polymorph was solved as well using ADT.  
%F PUB:(DE-HGF)16
%9 Journal Article
%$ pmid:38728046
%U <Go to ISI:>//WOS:001258410100003
%R 10.1107/S2052520624002683
%U https://bib-pubdb1.desy.de/record/607003