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.

中文翻译：

---

NaLn(IO3)4 碘酸盐（Ln = Pr、Tb）：NaY(IO3)4 结构非线性光学晶体的新代表

 抽象的

Na ₂ HPO ₄ ⋅12H ₂ O 导致形成复杂的 NaLn(IO ₃ ) ₄ 碘酸盐。 Pr和Tb的化合物为首次报道。单晶研究表明，它们与之前报道的其他稀土类似物具有同构结构，并采用非中心对称空间群 Сс。多晶样品产生高于磷酸二氢钾参考标准的强 SHG 信号。它们还表现出广泛的光学透明区域和高热稳定性。