Local Structure and Spin Transition in Fe2O3 Hematite at High-Pressure

Andrea Sanson; Innokenty Kantor; Valerio Cerantola; Tetsuo Irifune; Alberto Carnera; Sakura Pascarelli

doi:10.1103/PhysRevB.94.014112

Local Structure and Spin Transition in Fe2O3 Hematite at High-Pressure

Materials Science 2016-07-20 v1

Authors: Andrea Sanson , Innokenty Kantor , Valerio Cerantola , Tetsuo Irifune , Alberto Carnera , Sakura Pascarelli

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Abstract

The pressure evolution of the local structure of Fe2O3 hematite has been determined for the first time by extended x-ray absorption fine structure up to 79 GPa. The comparison to the different high-pressure forms proposed in the literature suggests that the orthorhombic structure with space group Aba2 is the most probable. The crossover from Fe high-spin to low-spin states with pressure increase has been monitored from the pre-edge region of the Fe K-edge absorption spectra. The "simultaneous" comparison with the local structural changes allows us to definitively conclude that it is the electronic transition that drives the structural transition and not viceversa.

Keywords

Fe2O3 hematite high pressure local structure spin transition extended x-ray absorption fine structure orthorhombic structure electronic transition

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@article{arxiv.1602.06721,
  title  = {Local Structure and Spin Transition in Fe2O3 Hematite at High-Pressure},
  author = {Andrea Sanson and Innokenty Kantor and Valerio Cerantola and Tetsuo Irifune and Alberto Carnera and Sakura Pascarelli},
  journal= {arXiv preprint arXiv:1602.06721},
  year   = {2016}
}

Local Structure and Spin Transition in Fe2O3 Hematite at High-Pressure

Abstract

Keywords

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