Alkali Rare Earth Selenites

The following semiconducting, ferromagnetic compositions have been described and characterized by their paramagnetic Curie temperature 0p  

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The presence of an additional cation also makes the thermogram more complex, as seen for the alkali rare earth selenites (Erametsa et al., 1973) and the corresponding scandium compounds, which also contain variable amounts of hydrogen (Znamenskaya et al., 1978). Below 1000°C the end products contain the alkali ion. The extra cation is volatilized at relatively low temperatures or below 600°C only in the case of ammonium compounds (Erametsa et al., 1973). 

The volume Rare Earth Elements C 9 deals with the rare earth selenides, oxide selenides, selenites, and selenates, as well as the associated alkali double compounds, diselenate nitrates, and the selenide halides. So far as meaningful and as in all earlier volumes of Rare Earth Elements Series C ( Seltenerdelemente Reihe C), comparative data are presented in sections preceding treatment of the individual compounds and systems. 

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