[23p-12N-1~15] 11.2 Thin and thick superconducting films, coated conductors and film crystal growth

1:30 PM - 1:45 PM JST(4:30 AM - 4:45 AM UTC)

[23p-12N-1] Synthesis of NbSe₂ by topotactic reaction using NbSe₃

〇Masakatsu Tsubota¹, Takuya Ito², Masahito Watanabe² (1.Natl.Inst.Kitakyushu, 2.Gakushuin Univ.)

Keywords:

linear MX2,superconductivity,topotactic reaction

Using NbSe₃ crystals, we conducted observations of its decomposition through topotactic reactions under different conditions: air, vacuum, and Ar atmosphere. Our findings revealed that when oxygen was present, O and Se were replaced, resulting in the formation of Nb₂O₅. In vacuum or Ar atmosphere, NbSe₂ was synthesized by the desorption of Se. Under an Ar atmosphere, the crystal transformed into a bulk shape, while in vacuum, it retained its original shape and formed linear NbSe₂. The synthesized NbSe₂ exhibited a superconducting transition.