Abstract
Three Ln 2M 2O 7 compounds (Ln 3+ = Europium, M 4+ = Tin, Titanium and Zirconium) are investigated by X-ray diffraction, and by optical methods making use of the local structural probe character of Eu 3+ (4 f 6). It is shown that Eu 2Sn 2O 7 and Eu 2Ti 2O 7 are mainly constituted of an ordered pyrochlore phase where the europium ion is effectively in a D 3 d site with a center of inversion (no dipolar electric optical transitions). On the other hand Eu 2Zr 2O 7 appears to be, both from X-ray diffraction and optical spectra, a mixture of a disordered phase where the europium is at a site without inversion center, very likely C 3 v , because of the existence of dipolarelectric transitions, and of a phase, more abundant at high temperature, which could be an ordered pyrochlore.
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