{"title":"A Giant Optically Anisotropic Phosphate Driven by Mixed Valence Mercury Units","authors":"Peng-Fei Li, Chun-Li Hu, Jiang-Gao Mao, Fang Kong","doi":"10.1002/lpor.202401488","DOIUrl":null,"url":null,"abstract":"Phosphate crystals are known for their low birefringence, a result of the symmetrical tetrahedral structure of PO<sub>4</sub> groups. Attempts to increase their birefringence have traditionally involved the incorporation of highly anisotropic ions and groups. Yet, the majority of the modified phospates still exhibit a birefringence value below 0.1, due to the counteracting effects of anisotropic elements within the tetrahedral coordination. The present study has for the first time discovered a novel birefringence-active Hg<sup>I</sup><sub>2</sub>Hg<sup>II</sup>O<sub>9</sub> unit and successfully constructed a highly anisotropic layered structure, which ingeniously prevents the mutual cancellation of anisotropic effects. This synthesis of Hg<sup>I</sup><sub>2</sub>Hg<sup>II</sup>(Te<sub>2</sub>O<sub>4</sub>)<sub>2</sub>(HPO<sub>4</sub>)<sub>2</sub> confirms the effectiveness of this strategy, yielding a birefringence of 0.444 at 546 nm, which outperforms 99% of phosphate crystals and surpasses that of commercial counterparts like YVO<sub>4</sub> (0.209@1064 nm) and CaCO<sub>3</sub> (0.175@533 nm). Structural analysis and PAWED calculations indicate that the significant birefringence is attributed to the synergistic interaction between the Hg<sup>I</sup><sub>2</sub>Hg<sup>II</sup>O<sub>9</sub> unit (23.76%), HPO<sub>4</sub> tetrahaedron (24.24%) and TeO<sub>4</sub> group (51.99%). This breakthrough paves the way for phosphates to meet the demands of modern technological advancements, expanding their potential applications in the field of anisotropic optics.","PeriodicalId":204,"journal":{"name":"Laser & Photonics Reviews","volume":null,"pages":null},"PeriodicalIF":9.8000,"publicationDate":"2024-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Laser & Photonics Reviews","FirstCategoryId":"101","ListUrlMain":"https://doi.org/10.1002/lpor.202401488","RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"OPTICS","Score":null,"Total":0}
引用次数: 0
Abstract
Phosphate crystals are known for their low birefringence, a result of the symmetrical tetrahedral structure of PO4 groups. Attempts to increase their birefringence have traditionally involved the incorporation of highly anisotropic ions and groups. Yet, the majority of the modified phospates still exhibit a birefringence value below 0.1, due to the counteracting effects of anisotropic elements within the tetrahedral coordination. The present study has for the first time discovered a novel birefringence-active HgI2HgIIO9 unit and successfully constructed a highly anisotropic layered structure, which ingeniously prevents the mutual cancellation of anisotropic effects. This synthesis of HgI2HgII(Te2O4)2(HPO4)2 confirms the effectiveness of this strategy, yielding a birefringence of 0.444 at 546 nm, which outperforms 99% of phosphate crystals and surpasses that of commercial counterparts like YVO4 (0.209@1064 nm) and CaCO3 (0.175@533 nm). Structural analysis and PAWED calculations indicate that the significant birefringence is attributed to the synergistic interaction between the HgI2HgIIO9 unit (23.76%), HPO4 tetrahaedron (24.24%) and TeO4 group (51.99%). This breakthrough paves the way for phosphates to meet the demands of modern technological advancements, expanding their potential applications in the field of anisotropic optics.
期刊介绍:
Laser & Photonics Reviews is a reputable journal that publishes high-quality Reviews, original Research Articles, and Perspectives in the field of photonics and optics. It covers both theoretical and experimental aspects, including recent groundbreaking research, specific advancements, and innovative applications.
As evidence of its impact and recognition, Laser & Photonics Reviews boasts a remarkable 2022 Impact Factor of 11.0, according to the Journal Citation Reports from Clarivate Analytics (2023). Moreover, it holds impressive rankings in the InCites Journal Citation Reports: in 2021, it was ranked 6th out of 101 in the field of Optics, 15th out of 161 in Applied Physics, and 12th out of 69 in Condensed Matter Physics.
The journal uses the ISSN numbers 1863-8880 for print and 1863-8899 for online publications.