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Intermetallics are chemical compounds formed by two metallic chemical elements. The resulting compounds are chemically different from either of the two constituents, and offer additional benefits or drawbacks, depending on the intended use of the substance. An intermetallic compound is different from an alloy, defined as a homogeneous mixture of metals. A commonly used example of an intermetallic is cementite - Fe<sub>3</sub>C, present in many steels.