Quaternary phase

In materials chemistry, a quaternary phase is a chemical compound containing four elements.

Some compounds can be molecular or ionic, examples being chlorodifluoromethane (CHClF2) and sodium bicarbonate (NaCO3H).

More typically quaternary phase refers to extended solids.

A famous example are the yttrium barium copper oxide superconductors.

This article about chemical compounds is a stub.

YBa 2 Cu 3 O 7 , abbreviated YBCO is a famous quaternary phase. It features four elements: yttrium (Y), barium (Ba), copper (Cu), and oxygen (O).