A new polar glass–ceramic built from monovalent perrhenate anions and large methyltriphenylphosphonium cations

Abstract

By employing monovalent and slightly-distorted tetrahedral [ReO₄]⁻ anions coupled with bulky methyltriphenylphosphonium cations (MTP⁺), we constructed a new hybrid compound in a polar space group Pca2₁. It exhibits reversible crystal-liquid-glass-crystal phase transitions, which enable an easily-fabricable polar glass–ceramic with eleven-fold-enhanced second-harmonic generation efficiency versus its crystalline state.