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An alloy is a mixture of metals or a mixture of a metal and another element.Alloys are defined by metallic bonding character.he term alloy is used to describe a mixture of atoms in which the primary constituent is a metal. The primary metal is called the base, the matrix, or the solvent. The secondary constituents are often called solutes.
Hard osmium-containing alloys are used in many contexts where resistance to wear due to friction or frequent operation is desirable; this includes use in the tips of fountain pens, instrument pivots, and electrical contacts.Despite its extreme toxicity, osmium tetroxide is the most frequently used osmium compound.It is valuable in the life sciences for staining and fixing biological tissue for electron microscopy, where it provides contrast that would otherwise be lacking when imaging substances made primarily of carbon.espite its extreme toxicity, osmium tetroxide is the most frequently used osmium compound. It is valuable in the life sciences for staining and fixing biological tissue for electron microscopy, where it provides contrast that would otherwise be lacking when imaging substances made primarily of carbon.