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.^[1]

1. ^ Greenwood, Norman N.; Earnshaw, Alan (1997). Chemistry of the Elements (2nd ed.). Butterworth-Heinemann. doi:10.1016/C2009-0-30414-6. ISBN 978-0-08-037941-8.

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