The new zirconium fluoride, K₃Ba₂Zr₆F₃₁, is reported, featuring unprecedented acentric cis-[Zr₆F₃₄]¹⁰⁻ clusters composed of ZrF₈ units, which display a moderate second-harmonic generation response (0.5 × KH₂PO₄) and short UV cutoff edge (below 200 nm).

Two Sn-based chalcogenides BaZnSnQ₄ (Q = S, Se) synthesized based on the idea of heterovalent cations co-substitution exhibit good SHG effects and large LIDTs.

First phase-matchable metal mixed halides with deep-ultraviolet transmittance, KBa₃M₂F₁₄Cl (M = Zr, Hf), show largest SHG effects coming from isolated MF₇units, Ba²⁺and Cl⁻cations. And the optimally aligning MF₇units work for large birefringence.