TY  - JOUR
AU  - Gollé-Leidreiter, Philipp
AU  - Bhat, Shrikant
AU  - Wiehl, Leonore
AU  - Wen, Qingbo
AU  - Kroll, Peter
AU  - Ishikawa, Ryo
AU  - Etter, Martin
AU  - Farla, Robert
AU  - Ikuhara, Yuichi
AU  - Riedel, Ralf
AU  - Kolb, Ute
TI  - 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
JO  - Acta crystallographica / Section B
VL  - 80
IS  - 3
SN  - 2052-5206
CY  - Oxford [u.a.]
PB  - Wiley-Blackwell
M1  - PUBDB-2024-01708
SP  - 182-192
PY  - 2024
AB  - 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.  
LB  - PUB:(DE-HGF)16
C6  - pmid:38728046
UR  - <Go to ISI:>//WOS:001258410100003
DO  - DOI:10.1107/S2052520624002683
UR  - https://bib-pubdb1.desy.de/record/607003
ER  -