[2] Day was a pioneer of materials chemistry, seeking unusual physical properties in inorganic and metal–organic compounds and models to explain them.
He played a major role in the development of mixed-valence chemistry, and has carried out important and elegant experimental and theoretical work on the spectra, magnetic properties and conductivity of solid, inorganic complexes.
[1] Peter Day's graduate work initiated the study of mixed-valence compounds and led to the Robin-Day Classification of such species.
[10] He served many national and international agencies and institutions, both professional and governmental, and held numerous honorary degrees and fellowships.
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