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Characterization of an AX Compound Derived from Ti 2 SC MAX Phase
Author(s) -
Hasegawa George,
Kawahara Kei,
Shima Kazunari,
Inada Miki,
Enomoto Naoya,
Hayashi Katsuro
Publication year - 2019
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/ejic.201900311
Subject(s) - chemistry , monoclinic crystal system , amorphous solid , electrochemistry , acetone , titanium , etching (microfabrication) , spark plasma sintering , characterization (materials science) , extraction (chemistry) , sulfur , stoichiometry , phase (matter) , electrode , carbon fibers , crystal structure , crystallography , analytical chemistry (journal) , nanotechnology , organic chemistry , materials science , microstructure , layer (electronics) , composite number , composite material
Extraction of M elements from MAX phases results in “ AX ” compounds in contrast to the well‐defined two‐dimensional (2D) materials known as MX ene, which are prepared by the selective etching of A elements. Despite the extensive studies on MX ene from both experimental and computational aspects, the nature of the AX compounds still remains elusive, because the electrochemical etching of M atoms from MAX significantly spoils the crystal structure, predominantly resulting in amorphous AX products. Here, we demonstrate the characterization of an S/C complex prepared by the electrochemical etching of Ti 2 SC. The spark plasma sintering (SPS) technique affords a well‐sintered Ti 2 SC disk with high purity, which can be directly utilized as a binder‐free Ti 2 SC electrode. It is found that the electrochemically extracted Ti elements in NH 4 F electrolyte are partially crystallized into the monoclinic titanium oxynitride, TiO 0.34 N 0.74 . The formed amorphous S/C compound is classified into three components: acetone‐soluble volatiles including elemental sulfur, acetone‐insoluble volatiles, and non‐volatile species carbonizable into S‐doped carbon.