Synthetic Route of Layered Titanium Nitride Chloride TiNCl Using Sodium Amide

Masashi Tanaka; Noriyuki Kataoka; Ryo Matsumoto; Kei Inumaru; Yoshihiko Takano; Takayoshi Yokoya

doi:10.1021/acsomega.1c06986

Synthetic Route of Layered Titanium Nitride Chloride TiNCl Using Sodium Amide

ACS Omega. 2022 Feb 8;7(7):6375-6380. doi: 10.1021/acsomega.1c06986. eCollection 2022 Feb 22.

Authors

Masashi Tanaka¹, Noriyuki Kataoka², Ryo Matsumoto³, Kei Inumaru⁴, Yoshihiko Takano^{5

6}, Takayoshi Yokoya²

Affiliations

¹ Graduate School of Engineering, Kyushu Institute of Technology, Kitakyushu 804-8550, Japan.
² Graduate School of Natural Science and Technology, Okayama University, Okayama 700-8530, Japan.
³ ICYS, National Institute for Materials Science, Tsukuba 305-0047, Japan.
⁴ Department of Applied Chemistry, Graduate School of Engineering, Hiroshima University, Higashi-Hiroshima 739-8527, Japan.
⁵ MANA, National Institute for Materials Science, Tsukuba 305-0047, Japan.
⁶ Research Institute for Interdisciplinary Science (RIIS), Okayama University, Okayama 700-8530, Japan.

Abstract

A synthetic route in a closed system for layered titanium nitride chloride TiNCl has been developed using sodium amide NaNH₂ as a nitrogen source. A highly crystalline sample is obtained by an appropriate thermal decomposition of aminated titanium chloride. The obtained TiNCl was also characterized using electronic resistivity measurement and photoemission spectroscopy. TiNCl showed hopping conduction compatible with an in-gap state revealed by photoelectron spectroscopy. However, it appeared highly electron-doped, albeit without showing superconductivity. Comparison with the spectrum of superconducting sodium-doped samples suggests the presence of the microstructure required to exhibit superconductivity.