rézvasszulfid

Rezvasszulfid is the Hungarian name for iron(II) sulfide, which has the chemical formula FeS. It is an inorganic compound that occurs naturally as the mineral pyrrhotite. Iron(II) sulfide is a dark gray to black solid. It is insoluble in water. When heated in air, it oxidizes to form iron oxides and sulfur dioxide. Rezvasszulfid can be synthesized by reacting iron metal with sulfur at elevated temperatures. It is also produced as a byproduct in some industrial processes, such as the coking of coal. Historically, iron sulfides have been used in various applications, including the production of pigments and as a source of sulfur in chemical reactions. In geological contexts, rezvasszulfid is found in sedimentary rocks and is associated with environments lacking oxygen. Its magnetic properties vary depending on its exact stoichiometry and crystal structure, with some forms being ferromagnetic and others antiferromagnetic.