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Deep-Ultraviolet Transparent Zr/Hf Fluorides with Second-Harmonic Generation Effects Induced by Alkali-Metal

Ling Wang1, Mei Yan1, Min Li1

  • 1Jiangsu Provincial Key Laboratory of Green & Functional Materials and Environmental Chemistry, College of Chemistry and Materials, Yangzhou University, Yangzhou 225002, Jiangsu, China.

Inorganic Chemistry
|June 26, 2026
PubMed
Summary

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K<sub>5</sub>NaZr<sub>4</sub>F<sub>22</sub>(H<sub>2</sub>O)<sub>2</sub>: A Hydrated Zirconium Fluoride with a Second-Harmonic Generation Effect and a Short Ultraviolet Cutoff Edge Induced by Cosubstitution with Heterovalent Cations.

Inorganic chemistry·2025

Alkali-metal regulation in zirconium/hafnium fluorides creates noncentrosymmetric (NCS) structures for nonlinear-optical (NLO) applications. These new materials exhibit excellent UV transparency and second-harmonic-generation (SHG) responses.

Area of Science:

  • Materials Science
  • Solid-State Chemistry
  • Crystallography

Background:

  • Zirconium/hafnium fluorides are promising optical materials due to their short ultraviolet (UV) cutoff edges.
  • Developing nonlinear-optical (NLO) materials often involves transforming centrosymmetric (CS) structures into noncentrosymmetric (NCS) analogues.
  • Cationic regulation is a key strategy for achieving NCS structures and tuning material properties.

Purpose of the Study:

  • To synthesize and characterize novel Zr/Hf-based fluorides with varying alkali-metal cations.
  • To investigate the impact of cationic regulation on crystal structure, symmetry, and NLO properties.
  • To evaluate the UV transparency and second-harmonic-generation (SHG) capabilities of the synthesized compounds.

Main Methods:

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  • Synthesis of Zr/Hf-based fluorides with alkali-metal cations (K, Cs, Li).
  • Crystallographic analysis to determine space groups and structural features (chain-like, 0D, 3D anionic networks).
  • Optical characterization to assess UV absorption edges and second-harmonic-generation (SHG) responses.

    • Main Results:

    • Five new Zr/Hf-based fluoride compounds were synthesized: K8M5F28(H2O) (M=Zr, Hf), CsNaHfF6, and LiK10M6F35(H2O)2 (M=Zr, Hf).
    • Compounds incorporating Li+ exhibited NCS crystal structures, while others were CS.
    • Li+-containing compounds showed enhanced structural distortion and dipole alignment, leading to phase-matchable (PM) SHG responses.
    • All synthesized compounds demonstrated UV absorption edges below 200 nm, indicating superior UV transparency.

    Conclusions:

    • Alkali-metal regulation is an effective strategy for inducing symmetry breaking in Zr/Hf fluorides.
    • The introduction of Li+ cations promotes NCS structures and enhances SHG activity.
    • These novel materials possess excellent UV transparency and NLO properties, making them suitable for optical applications.