Abstract
Interaction of rare-earth oxides (Pr, Tb, Er) with periodic acid or sodium iodate under hydrothermal conditions in the presence of Na2HPO4⋅12H2O leads to formation of complex NaLn(IO3)4 iodates. The compounds of Pr and Tb are reported for the first time. Single-crystal studies reveal that they are isostructural to the previously reported analogs of other rare-earths and adopt the non-centrosymmetric space group Сс. Polycrystalline samples generate a strong SHG signal above that of the potassium dihydrogen phosphate reference standard. They also exhibit wide optical transparency areas and high thermal stability.
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