Effect of Annealing of Ca3TaGa3Si2O14 Catangasite Crystals on Their Optical Activity

IF 0.6 4区材料科学 Q4 CRYSTALLOGRAPHY

Crystallography Reports Pub Date : 2024-11-14 DOI:10.1134/S1063774524601667

T. G. Golovina, A. F. Konstantinova, V. M. Kasimova, E. V. Zabelina, N. S. Kozlova, G. Yu. Deev, O. A. Buzanov

{"title":"Effect of Annealing of Ca3TaGa3Si2O14 Catangasite Crystals on Their Optical Activity","authors":"T. G. Golovina, A. F. Konstantinova, V. M. Kasimova, E. V. Zabelina, N. S. Kozlova, G. Yu. Deev, O. A. Buzanov","doi":"10.1134/S1063774524601667","DOIUrl":null,"url":null,"abstract":"The spectral dependences of transmission and absorption in the wavelength range of 200–2500 nm were measured for Ca3TaGa3Si2O14 crystals cut perpendicular to the optical axis in the initial state (without annealing) and after isothermal annealing in vacuum and in air. It was found that annealings in vacuum and air lead, respectively, to decrease and increase in the absorption band intensity. A spectrophotometric method for measuring and calculating the specific rotation angle ρ of the plane of polarization of light in gyrotropic crystals from the transmission coefficient spectra at different angles between the polarizer and analyzer is considered. The transmission spectra were normalized to eliminate the spectral shifts associated with measurement features. Spectral dependences of ρ, approximated by the extended Drude formula, were obtained for all three samples; the influence of the annealing atmosphere on the coefficients of this formula is established.","PeriodicalId":527,"journal":{"name":"Crystallography Reports","volume":"69 5","pages":"704 - 710"},"PeriodicalIF":0.6000,"publicationDate":"2024-11-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Crystallography Reports","FirstCategoryId":"88","ListUrlMain":"https://link.springer.com/article/10.1134/S1063774524601667","RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q4","JCRName":"CRYSTALLOGRAPHY","Score":null,"Total":0}

引用次数: 0

Abstract

The spectral dependences of transmission and absorption in the wavelength range of 200–2500 nm were measured for Ca₃TaGa₃Si₂O₁₄ crystals cut perpendicular to the optical axis in the initial state (without annealing) and after isothermal annealing in vacuum and in air. It was found that annealings in vacuum and air lead, respectively, to decrease and increase in the absorption band intensity. A spectrophotometric method for measuring and calculating the specific rotation angle ρ of the plane of polarization of light in gyrotropic crystals from the transmission coefficient spectra at different angles between the polarizer and analyzer is considered. The transmission spectra were normalized to eliminate the spectral shifts associated with measurement features. Spectral dependences of ρ, approximated by the extended Drude formula, were obtained for all three samples; the influence of the annealing atmosphere on the coefficients of this formula is established.

Abstract Image

查看原文本刊更多论文

Ca3TaGa3Si2O14 星芒石晶体退火对其光学活性的影响

测量了垂直于光轴切割的 Ca3TaGa3Si2O14 晶体在初始状态（未退火）以及在真空和空气中进行等温退火后在 200-2500 纳米波长范围内的透射和吸收光谱关系。研究发现，真空退火和空气退火分别会导致吸收带强度的降低和增加。研究采用分光光度法，从偏振器和分析器之间不同角度的透射系数光谱中测量和计算陀螺晶体中光偏振面的特定旋转角 ρ。对透射光谱进行了归一化处理，以消除与测量特征相关的光谱偏移。通过扩展德鲁德公式近似得到了所有三种样品的 ρ 的光谱依赖关系；确定了退火气氛对该公式系数的影响。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

求助全文

约1分钟内获得全文求助全文

来源期刊

Crystallography Reports 化学-晶体学

CiteScore

1.10

自引率

28.60%

发文量

审稿时长

4-8 weeks

期刊介绍： Crystallography Reports is a journal that publishes original articles short communications, and reviews on various aspects of crystallography: diffraction and scattering of X-rays, electrons, and neutrons, determination of crystal structure of inorganic and organic substances, including proteins and other biological substances; UV-VIS and IR spectroscopy; growth, imperfect structure and physical properties of crystals; thin films, liquid crystals, nanomaterials, partially disordered systems, and the methods of studies.