伽马辐照下 Sr2+ 离子掺杂双硫脲-尿素混合晶体的结构、介电和 LDT 响应

IF 4 2区化学 Q2 CHEMISTRY, PHYSICAL Journal of Molecular Structure Pub Date : 2024-11-22 DOI:10.1016/j.molstruc.2024.140825

Dileep M S , Suresh Kumar H. M , Prashanth G K , Yashwanth H J , Madhukara Naik M , Jagadeesh M R , Srilatha Rao , Manoj Gadewar , H.S. Lalithamba , N.P. Bhagya

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引用次数: 0

摘要

利用慢速蒸发法生长了掺杂 Sr²⁺ 离子的双硫脲（SBTU）单晶。单晶 X 射线衍射 (XRD) 分析表明，这些晶体呈现出具有中心对称特征的正交菱形结构。粉末 XRD 分析表明，添加掺杂剂后晶体尺寸减小。通过 CHNS 分析、SEM 显微照片和 ICP-OES 分析，确定了晶体中掺杂锶的浓度和元素的百分比。晶体的热稳定性可达 171 ℃。紫外可见光谱显示，晶体在紫外、可见光和近红外区域都是透明的，光学截止点为 332 纳米。对晶体进行了伽马射线辐照，以检测其在辐射环境中的稳定性，辐照剂量分别为 1 Mrad、3 Mrad 和 5 Mrad。介电研究表明，辐照后介电常数和交流电导率增加，并且随着辐照剂量的增加而增加。光吸收特性也在辐照后增加。LDT 研究表明，伽马射线辐照后的稳定性有所提高。

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Structural, dielectric and LDT response of Sr2+ ions codoped bisthiourea-urea mixed crystals upon gamma irradiation

Single crystals of Sr²⁺ ions codoped bisthiourea-urea (SBTU) were grown using the method of slow evaporation. Single crystal X-ray diffraction (XRD) analysis revealed that the crystals exhibit orthorhombic structure with centro-symmetric characteristics. Powder XRD analysis shows a decrease in crystallite size after the addition of dopant. The concentration of strontium dopant and the percentage of elements present in the crystal was inveterated by CHNS analysis, SEM micrographs and ICP-OES analysis. Crystals show the thermal stability up to the temperature of 171 °C. UV–visible spectroscopy revealed the crystals are transparent across the UV, visible, and NIR regions, with an optical cutoff at 332 nm. Gamma radiation was irradiated to check the stability of the crystal in a radiation environment with different doses of 1 Mrad, 3 Mrad, and 5 Mrad. Dielectric studies show an increase in dielectric constant and AC conductivity after irradiation and also with increase in irradiation doses. Optical absorbance property also increases after irradiation. LDT study revealed an increase in the stability after gamma irradiation.

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来源期刊

Journal of Molecular Structure 化学-物理化学

CiteScore

7.10

自引率

15.80%

发文量

2384

审稿时长

45 days

期刊介绍： The Journal of Molecular Structure is dedicated to the publication of full-length articles and review papers, providing important new structural information on all types of chemical species including: • Stable and unstable molecules in all types of environments (vapour, molecular beam, liquid, solution, liquid crystal, solid state, matrix-isolated, surface-absorbed etc.) • Chemical intermediates • Molecules in excited states • Biological molecules • Polymers. The methods used may include any combination of spectroscopic and non-spectroscopic techniques, for example: • Infrared spectroscopy (mid, far, near) • Raman spectroscopy and non-linear Raman methods (CARS, etc.) • Electronic absorption spectroscopy • Optical rotatory dispersion and circular dichroism • Fluorescence and phosphorescence techniques • Electron spectroscopies (PES, XPS), EXAFS, etc. • Microwave spectroscopy • Electron diffraction • NMR and ESR spectroscopies • Mössbauer spectroscopy • X-ray crystallography • Charge Density Analyses • Computational Studies (supplementing experimental methods) We encourage publications combining theoretical and experimental approaches. The structural insights gained by the studies should be correlated with the properties, activity and/ or reactivity of the molecule under investigation and the relevance of this molecule and its implications should be discussed.