The Optical Degradation Characteristics of the Nanoparticles-Modified BaSO<sub>4</sub> Powder under Irradiation with Electrons and Protons

Mikhailov, Mikhail Mikhailovich; Yuryev, Semyon Alexandrovich; Lapin, Alexey Nikolaevich

doi:10.1590/1678-4324-2024220259

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Article - Engineering, Technology and Techniques • Braz. arch. biol. technol. 67 • 2024 • https://doi.org/10.1590/1678-4324-2024220259 copy

The Optical Degradation Characteristics of the Nanoparticles-Modified BaSO₄ Powder under Irradiation with Electrons and Protons

Authorship SCIMAGO INSTITUTIONS RANKINGS

Abstract

The work presents the study of synergistic effects in changing of 1) the diffuse reflectance spectra within 0.2-2.2 µm and 2) the solar absorptance of barium sulfate (nBaSO₄) modified by silicon dioxide nanoparticles under separate and simultaneous irradiation with 30 keV electrons and 5 keV protons. The spectra were recorded before and after each irradiation period in vacuum at the site of irradiation (in situ). It was found that the change in optical properties of the powder under simultanous irradiation is larger in comparison with the total change under separate irradiation, with the values of electron fluence varying up to F_е=9•10¹⁶ cm^-2 and the values of proton fluence varying up to F_р=6•10¹⁶ cm^-2. The difference reaches 1.24 times. The work provides the description of formation and accumulation of absorption centers under separate and sumultaneous irradiation of nBaSO₄.

Keywords:
barium sulfate; silicon dioxide; nanoparticles; irradiation; optical properties

HIGHLIGHTS

The composition, structure, and optical properties of nano-modified BaSO₄ powder under electron and proton irradiation were investigated.

The diffuse reflectance spectra were recorded in vacuum after each irradiation period.

Simultaneous irradiation changes the optical properties more expressively than separate one.

The mechanism of absorption centers’ formation under irradiation is suggested.

Irradiation mode	Wavenumber, cm^-1
Irradiation mode	476	610	642	810	985	1086	1132	1196	1400	2060	2356	3146
Before	0.036	0.862	0.544	0.003	0.107	1.026	1.086	0.998	0.024	0.002	0.007	0.031
e^-	0.049	0.823	0.504	0.016	0.138	1.041	1.086	0.996	0.006	0.014	0.005	0.001
p⁺	0.061	0.819	0.580	0.019	0.273	1.025	1.086	1.039	0.005	0.017	0.004	0.002
e^- + p⁺	0.041	1.015	0.674	0.005	0.228	1.007	1.086	1.036	0.015	0.001	0.001	0.034

Simultaneous irradiation time, hours		1	2.1	3	5	6.73
F_e-, cm^-2		1·10¹⁶	2.1·10¹⁶	3·10¹⁶	5·10¹⁶	6.73·10¹⁶
F_р+, cm^-2		0.37·10¹⁶	0.93·10¹⁶	1.35·10¹⁶	2.42·10¹⁶	3.36·10¹⁶
∆α_s	e^-	0.019	0.028	0.035	0.047	0.057
	р⁺	0.004	0.006	0.009	0.019	0.029
	e^- + р⁺	0.028	0.042	0.054	0.078	0.094
	∑Δα_s	0.023	0.034	0.044	0.066	0.086
C_add=∆α_ssim/∑Δα_s		1.22	1.24	1.23	1.18	1.09

Instituto de Tecnologia do Paraná - Tecpar Rua Prof. Algacyr Munhoz Mader, 3775 - CIC, 81350-010 Curitiba PR Brazil, Tel.: +55 41 3316-3052/3054, Fax: +55 41 3346-2872 - Curitiba - PR - Brazil
E-mail: babt@tecpar.br

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[1] *Correspondence: yusalek@gmail.com. (S.A.Y)

F_е-, cm^-2	0.5·10¹⁶	1.5·10¹⁶	3·10¹⁶	5·10¹⁶	7·10¹⁶	9·10¹⁶
∆α_s	0.018	0.027	0.038	0.049	0.059	0.072

F_р+, cm^-2	0.3·10¹⁶	1·10¹⁶	2·10¹⁶	3·10¹⁶	4.5·10¹⁶	6·10¹⁶
∆α_s	0.003	0.006	0.014	0.025	0.042	0.066

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The Optical Degradation Characteristics of the Nanoparticles-Modified BaSO4 Powder under Irradiation with Electrons and Protons

Abstract

HIGHLIGHTS

The Optical Degradation Characteristics of the Nanoparticles-Modified BaSO₄ Powder under Irradiation with Electrons and Protons