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@ARTICLE{Wang:637933,
      author       = {Wang, Yu and Bayarjargal, Lkhamsuren and Bykov, Maxim and
                      Bykova, Elena and Spahr, Dominik and Glazyrin, Konstantin
                      and Milman, Victor and Winkler, Bjoern},
      title        = {{C}r$^{3+}$ -{C}ontaining {C}arbonates and {C}r$_2${O}$_3$
                      - {P}bcn at {E}xtreme {C}onditions},
      journal      = {Inorganic chemistry},
      volume       = {64},
      number       = {10},
      issn         = {0020-1669},
      address      = {Washington, DC},
      publisher    = {American Chemical Society},
      reportid     = {PUBDB-2025-03923},
      pages        = {4996 - 5003},
      year         = {2025},
      note         = {We gratefully acknowledge funding from the DFG
                      (projectsWI1232 and BA4020) and the DFG-Research Unit
                      FOR2125/CarboPaT.},
      abstract     = {We synthesized three carbonates, Cr$_2$[CO$_3$]$_3$,
                      Cr$_2$[C$_2$O$_5$][CO$_3$]$_2$, and Cr$_2$[CO$_3$][O]$_2$,
                      containing Cr$^{3+}$ by laser heating of chromium oxides in
                      CO$_2$ at pressures between 45 and 55 GPa. All phases were
                      characterized by single-crystal X-ray diffraction and Raman
                      spectroscopy, while density functional theory calculations
                      complemented the experimental results. The structure of
                      Cr$_2$[CO$_3$]$_3$-P6$_3$/m contains coplanar groups, and a
                      4f Wyckoff site is half occupied by Cr$^{3+}$.
                      Cr$_2$[C$_2$O$_5$][CO$_3$]$_2$-C$_2$/c is characterized by
                      coplanar [CO$_3$]$_2$− and pyro- [C$_2$O$_5$]$_2$−
                      anions and is isostructural to
                      Al$_2$[C$_2$O$_5$][CO$_3$]$_2$. It was obtained only after
                      prolonged laser heating. The oxycarbonate
                      Cr$_2$[CO$_3$][O]$_2$-Pbcn was synthesized at the highest
                      pressure (55 GPa) studied here. In this structure, half of
                      the oxygen atoms coordinate one carbon and two Cr atoms,
                      while the other half coordinate three chromium atoms. The
                      oxidation state of chromium in the carbonates is +3,
                      independent of the oxidation state (+3 or +4) of chromium in
                      the oxide starting material. We observed the transformation
                      of Cr$_2$O$_3$-R3̅c to Cr$_2$O$_3$-Pbcn above 45(2) GPa
                      after laser heating.},
      cin          = {DOOR ; HAS-User / FS-PETRA-D},
      ddc          = {540},
      cid          = {I:(DE-H253)HAS-User-20120731 /
                      I:(DE-H253)FS-PETRA-D-20210408},
      pnm          = {631 - Matter – Dynamics, Mechanisms and Control
                      (POF4-631) / 6G3 - PETRA III (DESY) (POF4-6G3) / DFG project
                      G:(GEPRIS)264049573 - Carbonate und Schock-Kompression:
                      Stabilität, Phasentransformation und chemische Reaktionen
                      mit Silikaten (264049573) / FS-Proposal: I-20231276
                      (I-20231276)},
      pid          = {G:(DE-HGF)POF4-631 / G:(DE-HGF)POF4-6G3 /
                      G:(GEPRIS)264049573 / G:(DE-H253)I-20231276},
      experiment   = {EXP:(DE-H253)P-P02.2-20150101},
      typ          = {PUB:(DE-HGF)16},
      doi          = {10.1021/acs.inorgchem.4c05003},
      url          = {https://bib-pubdb1.desy.de/record/637933},
}