Impact of low dose of gamma irradiation on thin films of Bismuth Tri-iodide

IF 1.6 3区工程技术 Q3 CHEMISTRY, INORGANIC & NUCLEAR

Applied Radiation and Isotopes Pub Date : 2024-11-21 DOI:10.1016/j.apradiso.2024.111598

Alka Garg , Ruby Jindal

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Abstract

Thin films of Bismuth Tri-iodide BiI₃ were synthesized on a glass substrate by the thermal vacuum deposition technique. Films were exposed to gamma radiations of two doses 10 Gy and 50 Gy. Structural and optical properties of films were studied through X-ray Diffraction and UV spectroscopy both before and after the gamma irradiation. The effect of gamma radiations on microstructure parameters i.e. crystallite size and the micro-strain were studied qualitatively and quantitively. The observed increase in crystallite size and decrease in micro-strain is due to localized heating of crystallites which results in the merging of small crystallites and their assembly leading to the formation of larger crystallites as evident from X-ray Diffraction after gamma irradiation. Effect on the optical constants namely refractive index and extinction coefficient for different doses was also enumerated to throw light on the change in optical density of this material on gamma irradiation. It is observed that the refractive index n increases with an increase in the doses of gamma irradiation. The increase in optical density could be attributed either to the displacement of atoms from lattice sites to the interstitial sites or to the self-assembly behavior of the crystallites on irradiation. The absorption coefficient follows Urbach's empirical relation and exhibits exponential dependency on photon energy close to the band edge. Calculating Urbach's energy provides insight into the emergence of localized states at the energy gap's edges.

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低剂量伽马辐照对三碘化铋薄膜的影响。

采用热真空沉积技术在玻璃基板上合成了三碘化铋 BiI3 薄膜。薄膜受到 10 Gy 和 50 Gy 两种剂量的伽马射线照射。在伽马射线照射前后，通过 X 射线衍射和紫外光谱对薄膜的结构和光学特性进行了研究。定性和定量研究了伽马射线对微观结构参数（即晶粒尺寸和微应变）的影响。从伽马射线辐照后的 X 射线衍射图中可以看出，结晶尺寸的增大和微应变的减小是由于结晶的局部加热导致了小结晶的合并和组装，从而形成了较大的结晶。此外，还列举了不同剂量对光学常数（折射率和消光系数）的影响，以揭示伽马辐照对该材料光密度的影响。结果表明，折射率 n 随着伽马辐照剂量的增加而增加。光密度的增加可能是由于原子从晶格位移到了间隙位，也可能是由于晶体在辐照时的自组装行为。吸收系数遵循厄巴赫经验关系，与接近带边的光子能量呈指数关系。通过计算厄巴赫能量，可以深入了解能隙边缘局部态的出现。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Applied Radiation and Isotopes 工程技术-核科学技术

CiteScore

3.00

自引率

12.50%

发文量

406

审稿时长

13.5 months

期刊介绍： Applied Radiation and Isotopes provides a high quality medium for the publication of substantial, original and scientific and technological papers on the development and peaceful application of nuclear, radiation and radionuclide techniques in chemistry, physics, biochemistry, biology, medicine, security, engineering and in the earth, planetary and environmental sciences, all including dosimetry. Nuclear techniques are defined in the broadest sense and both experimental and theoretical papers are welcome. They include the development and use of α- and β-particles, X-rays and γ-rays, neutrons and other nuclear particles and radiations from all sources, including radionuclides, synchrotron sources, cyclotrons and reactors and from the natural environment. The journal aims to publish papers with significance to an international audience, containing substantial novelty and scientific impact. The Editors reserve the rights to reject, with or without external review, papers that do not meet these criteria. Papers dealing with radiation processing, i.e., where radiation is used to bring about a biological, chemical or physical change in a material, should be directed to our sister journal Radiation Physics and Chemistry.