Syntheses of EuLn2S4 and SrLn2S4 (Ln=Lu, Yb, Er, Y) with Th3P4 Type Structure
Hirota et al.  have indicated that some rare earth sulfides, ALn2S4 (A=Mg, Mn; Ln=Tm, Yb), transform from the spinel-type to the Th3P4-type phase by compression. Another kind of Compound exists whose composition is also denoted as ALn2S4 but whose structure is classified as the CaFe2O4-type . The packing of constituent ions in the CaFe2O4-type is denser than that in spinel but looser than in the Th3P4-type. It is expected, therefore, that the CaFe2O4-type Compounds transfrom to the Th3P4-type phase under pressure more easily than in the case of the spinel-type. This report provides some results of this kind of pressure-induced phase transformation observed in EuLn2S4 (Ln=Y, Er, Yb, Lu) and SrLn2S4 (Ln=Y, Er, Yb). A thermodynamical consideration of the phase transformation of EUY2S4 between the CaFe2O4- and the Th3P4- types is also given.
KeywordsMagnetic Susceptibility Thermodynamical Consideration Electric Power Input Einstein Formula Tropic Relation
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