Effect of X-ray irradiation on the optical properties of K2Ni(SO4)2(H2O)6 single crystal grown by slow evaporation method

IF 2.8 3区物理与天体物理 Q3 CHEMISTRY, PHYSICAL

Radiation Physics and Chemistry Pub Date : 2025-06-06 DOI:10.1016/j.radphyschem.2025.113052

A.M. Abdulwahab , A. Abu El-Fadl

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Abstract

The compound potassium nickel sulfate hexahydrate which has the chemical formula K₂Ni(SO₄)₂(H₂O)₆ and is abbreviated as KNISH, was synthesized as an aqueous solution. An indigenous crystal growth apparatus was used to grow single crystal of KNISH by the slow evaporation of the supersaturated aqueous solution. The crystal was irradiated with several doses of X-ray from 0.4 to 2.4 kGy with dose rate of 16 Gy/min and the effect of irradiation on the optical properties was studied for the first time. X-ray irradiation changed the optical transmittance of KNISH crystal especially the band in the ultraviolet region. The band width decreased, its intensity decreased, and the corresponding wavelength increased with increasing the irradiation dose. The irradiation did not affect the efficiency of KNISH crystal for using as an ultraviolet light filter and sensor in solar-blind applications. X-ray irradiation increased absorption coefficient in photon energies range more than 4 eV. The optical energy gap of unirradiated KNISH crystal was 6.44 eV and it decreased to 6.11 eV with increasing the irradiation dose to 2.4 kGy. Urbach energy of unirradiated KNISH crystal was 0.22 eV. It decreased to 0.09 eV with low irradiation doses (0–1.6 kGy) and then it increased to 0.24 eV with high irradiation doses (1.6–2.4 kGy).

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x射线辐照对慢蒸发法生长K2Ni(SO4)2(H2O)6单晶光学性质的影响

以水溶液的形式合成了化学式为K2Ni(SO4)2(H2O)6（简称KNISH）的六水硫酸镍钾化合物。利用国产晶体生长装置，通过过饱和水溶液的缓慢蒸发，生长出KNISH单晶。用0.4 ~ 2.4 kGy剂量率为16 Gy/min的x射线辐照晶体，首次研究了辐照对晶体光学性质的影响。x射线辐照改变了KNISH晶体的透光率，特别是紫外波段。随着辐照剂量的增加，其能带宽度减小，强度减小，对应波长增大。辐照不影响KNISH晶体在太阳盲应用中作为紫外线滤光器和传感器的效率。在光子能量大于4 eV的范围内，x射线辐照增加了吸收系数。未辐照的KNISH晶体的光能隙为6.44 eV，随着辐照剂量的增加至2.4 kGy，光能隙减小至6.11 eV。未辐照KNISH晶体的乌尔巴赫能为0.22 eV。在低辐照剂量（0 ~ 1.6 kGy）下，辐射强度减小至0.09 eV，在高辐照剂量（1.6 ~ 2.4 kGy）下，辐射强度增大至0.24 eV。

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来源期刊

Radiation Physics and Chemistry 化学-核科学技术

CiteScore

5.60

自引率

17.20%

发文量

574

审稿时长

12 weeks

期刊介绍： Radiation Physics and Chemistry is a multidisciplinary journal that provides a medium for publication of substantial and original papers, reviews, and short communications which focus on research and developments involving ionizing radiation in radiation physics, radiation chemistry and radiation processing. 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. This could include papers that are very similar to previous publications, only with changed target substrates, employed materials, analyzed sites and experimental methods, report results without presenting new insights and/or hypothesis testing, or do not focus on the radiation effects.