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A Polar Tetragonal Tungsten Bronze with Colossal Second‐Harmonic Generation

A polar tetragonal tungsten bronze, Pb(1.91)K(3.22)□(0.85)Li(2.96)Nb(10)O(30) (□: vacancies), has been successfully synthesized by a high temperature solid‐state reaction. Single crystal and powder X‐ray diffraction indicate that the structure of Pb(1.91)K(3.22)□(0.85)Li(2.96)Nb(10)O(30) crystallizi...

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Autores principales: Kuk, Yunseung, Bae, Seong Bin, Yang, Sang Mo, Ok, Kang Min
Formato: Online Artículo Texto
Lenguaje:English
Publicado: John Wiley and Sons Inc. 2023
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10323606/
https://www.ncbi.nlm.nih.gov/pubmed/37088734
http://dx.doi.org/10.1002/advs.202301374
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author Kuk, Yunseung
Bae, Seong Bin
Yang, Sang Mo
Ok, Kang Min
author_facet Kuk, Yunseung
Bae, Seong Bin
Yang, Sang Mo
Ok, Kang Min
author_sort Kuk, Yunseung
collection PubMed
description A polar tetragonal tungsten bronze, Pb(1.91)K(3.22)□(0.85)Li(2.96)Nb(10)O(30) (□: vacancies), has been successfully synthesized by a high temperature solid‐state reaction. Single crystal and powder X‐ray diffraction indicate that the structure of Pb(1.91)K(3.22)□(0.85)Li(2.96)Nb(10)O(30) crystallizing in the noncentrosymmetric (NCS) space group, P4bm, consists of 3D framework with highly distorted NbO(6), LiO(9), PbO(12), and (Pb/K)O(15) polyhedra. While NCS Pb(1.91)K(3.22)□(0.85)Li(2.96)Nb(10)O(30) undergoes a reversible phase transition between polar (P4bm) and nonpolar (P4/mbm) structure at around 460 °C, the material decomposes to centrosymmetric Pb(1.45)K(3.56)Li(3.54)Nb(10)O(30) (P4/mbm) once heated to 1200 °C. Powder second‐harmonic generation (SHG) measurements with 1064 nm radiation indicate that Pb(1.91)K(3.22)□(0.85)Li(2.96)Nb(10)O(30) exhibits a giant phase‐matchable SHG intensity of ≈71.5 times that of KH(2)PO(4), which is the strongest intensity in the visible range among all nonlinear optical materials reported to date. The observed colossal SHG should be attributable to the synergistic effect of dipole moments from the well‐aligned NbO(6) octahedra, the constituting distortive channels with vacancies, and highly polarizable cations.
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spelling pubmed-103236062023-07-07 A Polar Tetragonal Tungsten Bronze with Colossal Second‐Harmonic Generation Kuk, Yunseung Bae, Seong Bin Yang, Sang Mo Ok, Kang Min Adv Sci (Weinh) Research Articles A polar tetragonal tungsten bronze, Pb(1.91)K(3.22)□(0.85)Li(2.96)Nb(10)O(30) (□: vacancies), has been successfully synthesized by a high temperature solid‐state reaction. Single crystal and powder X‐ray diffraction indicate that the structure of Pb(1.91)K(3.22)□(0.85)Li(2.96)Nb(10)O(30) crystallizing in the noncentrosymmetric (NCS) space group, P4bm, consists of 3D framework with highly distorted NbO(6), LiO(9), PbO(12), and (Pb/K)O(15) polyhedra. While NCS Pb(1.91)K(3.22)□(0.85)Li(2.96)Nb(10)O(30) undergoes a reversible phase transition between polar (P4bm) and nonpolar (P4/mbm) structure at around 460 °C, the material decomposes to centrosymmetric Pb(1.45)K(3.56)Li(3.54)Nb(10)O(30) (P4/mbm) once heated to 1200 °C. Powder second‐harmonic generation (SHG) measurements with 1064 nm radiation indicate that Pb(1.91)K(3.22)□(0.85)Li(2.96)Nb(10)O(30) exhibits a giant phase‐matchable SHG intensity of ≈71.5 times that of KH(2)PO(4), which is the strongest intensity in the visible range among all nonlinear optical materials reported to date. The observed colossal SHG should be attributable to the synergistic effect of dipole moments from the well‐aligned NbO(6) octahedra, the constituting distortive channels with vacancies, and highly polarizable cations. John Wiley and Sons Inc. 2023-04-23 /pmc/articles/PMC10323606/ /pubmed/37088734 http://dx.doi.org/10.1002/advs.202301374 Text en © 2023 The Authors. Advanced Science published by Wiley‐VCH GmbH https://creativecommons.org/licenses/by/4.0/This is an open access article under the terms of the http://creativecommons.org/licenses/by/4.0/ (https://creativecommons.org/licenses/by/4.0/) License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
spellingShingle Research Articles
Kuk, Yunseung
Bae, Seong Bin
Yang, Sang Mo
Ok, Kang Min
A Polar Tetragonal Tungsten Bronze with Colossal Second‐Harmonic Generation
title A Polar Tetragonal Tungsten Bronze with Colossal Second‐Harmonic Generation
title_full A Polar Tetragonal Tungsten Bronze with Colossal Second‐Harmonic Generation
title_fullStr A Polar Tetragonal Tungsten Bronze with Colossal Second‐Harmonic Generation
title_full_unstemmed A Polar Tetragonal Tungsten Bronze with Colossal Second‐Harmonic Generation
title_short A Polar Tetragonal Tungsten Bronze with Colossal Second‐Harmonic Generation
title_sort polar tetragonal tungsten bronze with colossal second‐harmonic generation
topic Research Articles
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10323606/
https://www.ncbi.nlm.nih.gov/pubmed/37088734
http://dx.doi.org/10.1002/advs.202301374
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