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@ARTICLE{Zhang:644986,
      author       = {Zhang, Fengqi and Wu, Ziying and Gong, Yong and Li, Wenjie
                      and Miao, Xuefei and Liu, Jun and Xia, Yuanguang and Yin,
                      Wen and Lienert, Ulrich and Eijt, Stephan and Wu, Zhenduo
                      and Schut, Henk and Cizek, Jakub and van Dijk, Niels and
                      Brück, Ekkes and Ren, Yang},
      title        = {{A}tomic vacancy defect modulated giant magnetocaloric
                      effect in multi-component {M}n{C}o{N}i{G}e{S}i based
                      compounds},
      journal      = {Acta materialia},
      volume       = {300},
      issn         = {1359-6454},
      address      = {Amsterdam [u.a.]},
      publisher    = {Elsevier Science},
      reportid     = {PUBDB-2026-00514},
      pages        = {121508},
      year         = {2025},
      note         = {Waiting for fulltext},
      abstract     = {Recently, the promising multi-component magnetocaloric
                      materials (Mc-MCMs) are found to have a tunable giant
                      magnetocaloric effect (GMCE) near room-temperature and
                      manifest fruitful functionalities like multi-caloric
                      effects, which are candidates for solid-state caloric
                      applications. Introducing vacancy defects is found to be an
                      efficient method to optimize its GMCE property. However, the
                      responsible mechanism and especially the characteristics of
                      the atomic vacancies are far from being elucidated. Here, we
                      produce direct-solidified MnCoNiGeSi-based Mc-MCMs which
                      exhibit the distinct shift in transition temperature (Tt)
                      upon introducing Mn/Ni vacancies. It is found that Tt
                      decreased significantly in the Mn vacancy materials and
                      increased in the Ni vacancy materials. The first-order
                      transition is maintained and the strength of the magnetic
                      entropy change (Δsm) was unchanged without degradation. For
                      the Mn vacancy sample the decreased Mn-Mn atomic distance
                      and strengthened covalent bonding can stabilize the
                      high-temperature hexagonal phase, while for the Ni vacancy
                      sample the decreased interatomic distances among different
                      pairs (Mn-Ge, Mn-Mn and Mn-Ni) promote the stabilization of
                      the low-temperature orthorhombic phase. Additionally, the
                      introduced vacancy defects have directly been observed
                      through HAADF-STEM. Positron annihilation results clarified
                      the mono-vacancy nature for these vacancies, and indicate
                      that the Ni positions around the Ni vacancies could
                      partially be occupied by Mn atoms. Our study reveals that
                      introducing atomic vacancy defects can effectively regulate
                      the magnetocaloric properties and provide important
                      fundamental insights into defect engineering of Mc-MCMs.},
      cin          = {FS DOOR-User / FS-PETRA-D},
      ddc          = {670},
      cid          = {$I:(DE-H253)FS_DOOR-User-20241023$ /
                      I:(DE-H253)FS-PETRA-D-20210408},
      pnm          = {632 - Materials – Quantum, Complex and Functional
                      Materials (POF4-632) / 6G3 - PETRA III (DESY) (POF4-6G3) /
                      FS-Proposal: I-20240028 (I-20240028)},
      pid          = {G:(DE-HGF)POF4-632 / G:(DE-HGF)POF4-6G3 /
                      G:(DE-H253)I-20240028},
      experiment   = {EXP:(DE-H253)P-P21.2-20150101},
      typ          = {PUB:(DE-HGF)16},
      doi          = {10.1016/j.actamat.2025.121508},
      url          = {https://bib-pubdb1.desy.de/record/644986},
}