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Synthesis of troilite by the arc-discharge method

National Laboratory of Mineral and Rock Materials, China University of Geosciences, 29 Xueyuan Road, Beijing 100083, China

^* E-mail: chendzh{at}sky.cugb.edu.cn

Troilite is a sulfide that occurs commonly in meteorites. In the laboratory, it can be synthesized by gas-solid reaction of metallic Fe and H₂S-H₂ gas mixtures. In this research, the arc-discharge method was used to synthesize troilite. The resulting spherules are up to 2–3 mm in diameter and composed of troilite, pyrrhotite and metallic Fe. Nanometer-sized hollow carbon fibres and balls occur on the surface of the spherules. The features and coexisting relationships of the constituents of the spherules were studied by X-ray diffraction (XRD), energy-dispersive X-ray spectrometry (EDS), scanning electron microscopy (SEM) and transmission electron microscopy (TEM), and the phenomenon of transformation of pyrite (FeS₂) into pyrrhotite (Fe_1–xS), troilite (FeS) and metallic Fe under arc-discharge reducing conditions were examined.

KEYWORDS: troilite, pyrrhotite, metallic Fe, arc-discharge method