The effect of gamma irradiation on the structural properties of olivine

Kądziołka-Gaweł, Mariola; Dulski, Mateusz; Kalinowski, L.; Wojtyniak, Marcin

doi:10.1007/s10967-018-5849-6

Cited by 9 publications

(4 citation statements)

References 20 publications

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“…It's well known that lattice parameters linearly decrease with increasing forsterite [3]. However, we compared the lattice parameters of B-rich forsterite (Fo = 99.7) with pure forsterite (Fo = 100) (Figure 4) [1,13]. The lattice parameters of the former are smaller than those of the latter.…”

Section: Raman Spectrummentioning

confidence: 95%

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Natural Forsterite Strongly Enriched in Boron: Crystal Structure and Spectroscopy

Peng

Yang

et al. 2022

Crystals

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Boron is a typical crustal element and largely incompatible in olivine. Most natural olivine samples have very low concentrations of boron. Recently, forsterite with high boron content (up to 60.53 wt% MgO and 1795.91 ppm B) has been discovered in the Jian forsterite jade in the Jian area of northeast China. In this study, B-rich forsterite was examined by electron microprobes, Laser Ablation-Inductively Coupled Plasma Mass Spectrometry, Single crystal X-ray diffraction, Raman spectroscopy, and infrared spectroscopy. The B-rich forsterite is orthorhombic, existing in space group Pnma, and its unit-cell parameters are: a = 10.1918(7) Å, b = 5.9689(4) Å, c = 4.7484(3) Å, α = 90°, β = 90°, γ = 90°, and V = 288.86(3) Å3. The results of single crystal X-ray diffraction analysis indicate that the unit-cell parameters (a, b, and c) and unit-cell volume of forsterite in Jian forsterite jade are much smaller than those of known olivine. An equivalent set of Raman and infrared spectra were measured for the natural B-rich forsterite and compared to the results for mantle forsterite with a Fo value of ~91. The Raman spectrum of B-rich forsterite is similar to that of mantle olivine. We conclude that the systematic peak position shifts towards higher Raman shift with increasing Fo content. The infrared spectrum of B-rich forsterite crystals is characterized by strong absorption bands at 761, 1168, 1259, and 1303 cm−1, which are assigned to stretching vibrations of BO3 groups. Our data further confirm the existence of the B(F, OH)Si–1O–1 coupled substitution in natural B-rich forsterite.

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Section: Raman Spectrummentioning

confidence: 95%

“…Si is on tetrahedral interstices and Mg and Fe ions are on octahedral sites (labeled M1 and M2). The M1 site is a distorted octahedra at the center of symmetry whereas M2 is a regular octahedra on the mirror plane [1][2][3][4]. Olivine is a general name of forsterite-fayalite sold solution [5].…”

Section: Introductionmentioning

confidence: 99%

Natural Forsterite Strongly Enriched in Boron: Crystal Structure and Spectroscopy

Peng

Yang

et al. 2022

Crystals

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“…First, due to a mutual torsion of tetrahedra under the effect of gamma irradiation, the above could cause deformations within the unit cell due to a change in the distance between oxygen, iron, magnesium, or any metal ions [30]. e second reason is because the intensity lines can change in the diffractograms and can be explained by the supply of additional energy to the crystal influenced by gamma radiation, which can increase the vibrations of the crystal lattice [30]. Any of the above reasons can change the number of diffraction particles in the plane and thus change the intensity line in the diffractograms.…”

Section: Gamma Irradiation and Effect Of Temperature Onmentioning

confidence: 99%

Prediction of Europium Retention in Perovskite: Potential Candidates for an Engineering Barrier in the Disposal of Radioactive Waste

Ortiz-Oliveros

Espinosa

Ávila-Pérez

et al. 2021

Journal of Chemistry

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Perovskites, such as tausonite, are crystalline metal oxides with excellent optical and photocatalytic properties and have also been used successfully in the retention of metals, simulating the isotopes of uranium and plutonium. In this work, different pseudo-order and thermodynamic models were studied to achieve the prediction of the sorption of Eu3+ (chemical analogous for actinides) in tausonite. The effects of gamma irradiation and temperature on the structural characteristics of the material were determined, as an additional step in the evaluation of material as an engineering barrier in the disposal of radioactive waste. The results obtained show that the tausonite is resistant to the gamma irradiation and thermal energy. Likewise, it was possible to determine that europium sorption occurs through an exothermic and spontaneous reaction, as well as through the formation of surface complexes, where Eu3+ ions bind to sites on the tausonite by dipole-dipole interaction. Furthermore, it was shown that the sorption mechanism is influenced by diffusive phenomena, which participate in the formation of surface complexes. Additionally, a new sorption model with respect to pH was proposed, which allowed determining the physical parameter π. The evidence obtained suggests that π is a physical parameter that relates pH to an optimal value and could explain the equilibrium between the surface complexes that tausonite forms with europium. Likewise, the evidence suggests that 50 kg of tausonite would have the capacity to retain at least 26.59 g of alpha-emitting radionuclides, equivalent to a waste package (900 kg) with a maximum activity of 4000 Bq/g.

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“…Therefore, the hyperfine magnetic fields obtained for these Feoxides and hydroxides are lower than those reported in the literature(Stevens et al 2005;Hassan 2015). The two doublets with isomer shift (IS) values of 1.06-1.21 mm/s and quadrupole splitting (QS) of 2.55-2.85 mm/s and 2.88-2.95 mm/s originate with Fe 2+ ions in the octahedral positions of the olivine structure(Kądziołka-Gaweł et al 2018). The doublet with the smaller quadrupole splitting, i.e.…”

mentioning

confidence: 99%

High temperature transformation of iron-bearing minerals in basalt: Mössbauer spectroscopy studies

2022

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The high temperature decomposition of basalt from Lower Silesia (Poland) was followed by Mössbauer spectroscopy investigation. The Fe content of the sample was ~9.0 at.%. The X-ray diffraction analysis shows that augite (37%) and olivine (12%) are major Fe-bearing mineral components. The sample also contains significant amount of anorthite (22%) and nepheline (17%). The sample was heated at various temperatures between 200°C and 1100°C for three hours. Up to a temperature of 500°C changes in contribution of Fe-bearing minerals are insignificant. Heating in the temperature range from 500°C to 1100°C leads to a systematic increase in contribution of iron oxides at the cost of contribution of silicate minerals, like augite and olivine. Mössbauer spectrum obtained after heating at 1100°C showed hematite as the main iron oxide phase. The ratio of Fe3+/Fetot in the non-heated sample was equal to 0.51 and after heating at 1100°C this ratio amounted to 0.89.

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The effect of gamma irradiation on the structural properties of olivine

Cited by 9 publications

References 20 publications

Natural Forsterite Strongly Enriched in Boron: Crystal Structure and Spectroscopy

Natural Forsterite Strongly Enriched in Boron: Crystal Structure and Spectroscopy

Prediction of Europium Retention in Perovskite: Potential Candidates for an Engineering Barrier in the Disposal of Radioactive Waste

High temperature transformation of iron-bearing minerals in basalt: Mössbauer spectroscopy studies

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