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Optical spectroscopy on one of a series (the europium compound) of the rare-earth aluminium borates indicates appreciable nonstoichiometry, confirmed by further x-ray studies. Detailed studies as a function of magnetic field and temperature of a particular transition (7F0—5D1) indicate that not only the Al3+ site but also other sites are being occupied by the rare-earth ions. Crystal-field splittings in 5D1 and 7F1 agree well with Judd's calculations, confirming the assignment of levels.

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