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2. Bi ₂ CoO ₂ F ₄ ─A Polar, Ferrimagnetic Aurivillius Oxide-Fluoride

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   Scott, Euan A. S.; Mitoudi Vagourdi, Eleni; Johnsson, Mats; Cascos, Vanessa; John, Filbin; Pickup, Dave; Chadwick, Alan V.; Djani, Hania; Bousquet, Eric; Zhang, Weiguo; et al (October 2022, Chemistry of Materials)
3. Preparation of CoGe ₂ -type NiSn ₂ at 10 GPa

   https://doi.org/10.1515/znb-2021-0115  

   Leineweber, Andreas; Wetzel, Marius Holger; Martin, Stefan; Shang, Shun-Li; Liu, Zi-Kui (September 2021, Zeitschrift für Naturforschung B)

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   Abstract An unprecedented NiSn 2 intermetallic with CoGe 2 -type crystal structure has been recovered (at ambient conditions) after high-pressure high-temperature treatment of a Ni 33 Sn 67 precursor alloy at 10 GPa and 400 °C. The orthorhombic structure with Aeam space group symmetry is pseudotetragonal. Based on the evaluation of powder X-ray diffraction data, lattice parameters of a  =  b  = 6.2818 Å and c  = 11.8960 Å have been determined. Complicated line broadening and results of a further microstructure analysis, however, imply a defective character of the crystal structure. First-principles calculations with different model structures and a comparison with structural trends in the literature suggest that at the high-pressure high-temperature conditions a CuAl 2 -type crystal structure might be stable, which transforms to the recovered CoGe 2 -type crystal structure upon cooling or the release of pressure. 

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   Bhattarai, Romakanta; Rhone, Trevor David (November 2024, ACS Applied Materials & Interfaces)

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