화학공학소재연구정보센터
Inorganic Chemistry, Vol.60, No.1, 19-23, 2021
KNa2ZrF7: A Mixed-Metal Fluoride Exhibits Phase-Matchable Second-Harmonic-Generation Effect and High Laser-Induced Damage Threshold
Halides are one type of important IR nonlinear-optical material candidate. Here, a mixed alkali metal and d(0) transition-metal fluoride, namely, KNa2ZrF7, was obtained by a facile hydrothermal method. It crystallizes in an orthorhombic system with the polar space group Pmn2(1), and its pseudo-1D structure features isolated (ZrF7)(3-) moncocapped trigonal prisms, which are ionically linked together by countercations K+ and Na+, representing a new type of fluoride. The powder sample of KNa2ZrF7 exhibits a moderate second-harmonic-generation response and a high laser-induced damage threshold. Besides, it can realize phase matchability and possesses a wide-IR transparent window. Thermal stability analysis suggests that KNa2ZrF7 is a congruent compound. Structural comparisons with related fluorides and theoretical calculations are also presented in this work.