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@ARTICLE{Sow:619705,
      author       = {Sow, Chaitali and Sarma, Abhisakh and Schropp, Andreas and
                      Keller, Thomas F. and Dzhigaev, Dmitry and Schroer,
                      Christian and Sanyal, Milan and Kulkarni, Giridhar},
      title        = {{R}eal-{T}ime {M}onitoring of {T}hermally {I}nduced
                      {T}wisting−{U}ntwisting of {N}oncubic {D}omains in {A}u
                      {M}icrocrystallites using {X}‑ray {D}iffraction
                      {M}icroscopy},
      journal      = {ACS nano},
      volume       = {19},
      number       = {21},
      issn         = {1936-0851},
      address      = {Washington, DC},
      publisher    = {Soc.},
      reportid     = {PUBDB-2024-07844},
      pages        = {19635 - 19645},
      year         = {2025},
      abstract     = {Au bipyramids hosting body-centered orthorhombic and
                      tetragonal lattices (bc(o,t)) exhibit extraordinary
                      stability at ambient conditions and even under
                      high-temperature/high-pressure conditions. The phases
                      undergo conversion to a conventional face-centered cubic
                      (fcc) lattice only during annealing at 700 °C due to the
                      unlocking of the geometrically induced stresses. The spatial
                      distribution of the phases in the crystallite volume has
                      revealed fcc capped bc(o,t) lattices with two halves of the
                      bipyramid twisted by ∼6° along the length with
                      approximately ± $5\%$ strain. Understanding the spatial
                      distribution and dynamics of these phases at high
                      temperatures can provide detailed information on their
                      thermal stability. Herein, using nanoprobe scanning X-ray
                      diffraction microscopy (SXDM), in situ annealing of the
                      bc(o,t) Au bipyramid (∼1.5 μm long and 300 nm wide) has
                      been performed at different temperatures (up to 800 °C).
                      The study reveals untwisting of the domains assisted by the
                      supplied high temperature, while the existing lattices
                      undergo variation in parameters with negligible changes in
                      proportion. The study reveals and picturizes the dynamic
                      change in diffracting volumes across a wide temperature
                      range. Notably, despite annealing, $∼83\%$ of the bc(o,t)
                      content is still retained (with different lattice
                      parameters), proposing the annealing route to produce
                      unusual metastable lattices of gold.},
      cin          = {FS-PETRA / FS-NL / DOOR ; HAS-User},
      ddc          = {540},
      cid          = {I:(DE-H253)FS-PETRA-20140814 / I:(DE-H253)FS-NL-20120731 /
                      I:(DE-H253)HAS-User-20120731},
      pnm          = {632 - Materials – Quantum, Complex and Functional
                      Materials (POF4-632) / 6G3 - PETRA III (DESY) (POF4-6G3) /
                      FS-Proposal: I-20170763 (I-20170763) / INDIA-DESY -
                      INDIA-DESY Collaboration $(2020_Join2-INDIA-DESY)$},
      pid          = {G:(DE-HGF)POF4-632 / G:(DE-HGF)POF4-6G3 /
                      G:(DE-H253)I-20170763 / $G:(DE-HGF)2020_Join2-INDIA-DESY$},
      experiment   = {EXP:(DE-H253)P-P06-20150101 /
                      EXP:(DE-H253)Nanolab-04-20150101},
      typ          = {PUB:(DE-HGF)16},
      pmc          = {pmc:PMC12139044},
      pubmed       = {pmid:40392953},
      UT           = {WOS:001491819900001},
      doi          = {10.1021/acsnano.4c18495},
      url          = {https://bib-pubdb1.desy.de/record/619705},
}