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@ARTICLE{Hu:637656,
      author       = {Hu, Huixin and Kuzovnikov, Mikhail A. and Shuttleworth,
                      Hannah A. and Marqueño, Tomas and Yan, Jinwei and Osmond,
                      Israel and Gorelli, Federico A. and Gregoryanz, Eugene and
                      Dalladay-Simpson, Philip and Ackland, Graeme J. and
                      Peña-Alvarez, Miriam and Howie, Ross},
      title        = {{U}nexpected compound reformation in the dense
                      selenium-hydrogen system},
      journal      = {Communications materials},
      volume       = {6},
      number       = {1},
      issn         = {2662-4443},
      address      = {London},
      publisher    = {Springer Nature},
      reportid     = {PUBDB-2025-03882},
      pages        = {193},
      year         = {2025},
      abstract     = {The H$_2$Se molecule and the van der Waals compound
                      (H$_2$Se)$_2$H$_2$ are both unstable upon room temperature
                      compression, dissociating into their constituent elements
                      above 22 GPa. Through a series of high pressure-high
                      temperature diamond anvil cell experiments, we report the
                      unexpected formation of a novel compound, SeH$_2$(H$_2$)$_2$
                      at pressures above 94 GPa. X-ray diffraction reveals the
                      metallic sublattice to adopt a tetragonal (I4$_1$/amd)
                      structure with density functional theory calculations
                      finding a small distortion due to the orientation of H$_2$
                      molecules. The structure comprises of a network of zig-zag
                      H-Se chains with quasi-molecular H$_2$ molecular units
                      hosted in the prismatic Se interstices. Electrical
                      resistance measurements demonstrate that SeH$_2$(H$_2$)$_2$
                      is non-metallic up to pressures of 148 GPa. Investigations
                      into the Te-H system up to pressures of 165 GPa and
                      2000 K yielded no compound formation. The combined results
                      suggest that the high pressure phase behavior of each
                      chalcogen hydride is unique and more complex than previously
                      thought.},
      cin          = {DOOR ; HAS-User},
      ddc          = {600},
      cid          = {I:(DE-H253)HAS-User-20120731},
      pnm          = {6G3 - PETRA III (DESY) (POF4-6G3) / MetElOne - The
                      Metallization Conditions of Element One (948895) /
                      FS-Proposal: I-20230232 (I-20230232)},
      pid          = {G:(DE-HGF)POF4-6G3 / G:(EU-Grant)948895 /
                      G:(DE-H253)I-20230232},
      experiment   = {EXP:(DE-H253)P-P02.2-20150101},
      typ          = {PUB:(DE-HGF)16},
      doi          = {10.1038/s43246-025-00899-9},
      url          = {https://bib-pubdb1.desy.de/record/637656},
}