**Preface to "Intermetallic Compound"**

In modern society, applications of new functional materials are diverse and countless. Intermetallics, namely, compounds formed by two or more metallic elements, are among the various novel and significant material developments. By definition, intermetallics are compounds of metals whose crystal structures are different from those of the constituent metals; thus, intermetallic phases and ordered alloys are included. Due to both their specific physical and mechanical properties, they occupy an intermediate position between metal and non-metal. Notably, intermetallic compounds have become a powerful spectrum for research in various branches of science. The enormous interest of scientists has contributed to the creation of various interesting compounds. In recent decades, a grea<sup>t</sup> number of scientific books and articles have been written, and many scientific meetings, such as conferences and workshops on intermetallic compounds, have been held. Intermetallics have received considerable attention, owing to their potential for various applications, such as their use as permanent magnets, magneto-optical recording media, hydrogen storage and magnetocaloric materials, turbine blades, and in microelectronics. With a favorable combination of high strength, low density, and good corrosion resistance, intermetallics are specifically suited for applications at high temperatures and in adverse environments. They can also display desirable magnetic, superconducting, and chemical properties due to their strong internal order and mixed metallic and covalent or ionic bonding, respectively.

> **Jacek Cwik ´** *Editor*
