Preparation of CoGe2-type NiSn2at 10 GPa

Andreas Leineweber, Marius Holger Wetzel, Stefan Martin, Shun Li Shang, Zi-kui Liu

Research output: Contribution to journalArticlepeer-review

Abstract

An unprecedented NiSn2 intermetallic with CoGe2-type crystal structure has been recovered (at ambient conditions) after high-pressure high-temperature treatment of a Ni33Sn67 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 CuAl2-type crystal structure might be stable, which transforms to the recovered CoGe2-type crystal structure upon cooling or the release of pressure.

Original languageEnglish (US)
Article number20210115
JournalZeitschrift fur Naturforschung - Section B Journal of Chemical Sciences
DOIs
StateAccepted/In press - 2021

All Science Journal Classification (ASJC) codes

  • Chemistry(all)

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