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Advances in Material Science Derived from Radiochemical Techniques and Radio Isotopes

A special issue of International Journal of Molecular Sciences (ISSN 1422-0067). This special issue belongs to the section "Materials Science".

Deadline for manuscript submissions: 31 August 2024 | Viewed by 701

Special Issue Editor

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Guest Editor
Department of Chemistry, Graduate School of Science, Tokyo Metropolitan University, Tokyo 192-0397, Japan
Interests: conductive vanadate; secondary battery electrodes; photocatalytic iron; tin silicate glass; environmental purification

Special Issue Information

Dear Colleagues,

Precise structural characterization is essential in the development of new functional glass, glass–ceramics, and metallic oxide nanoparticles because they have poor short-range atomic ordering. Improving and enhancing physical properties, such as electrical conductivity, and optical and magnetic properties are almost impossible without the use of precise structural molecular information like dipole moment in electrical conductive materials and superexchange interactions in magnetic materials. In order to achieve the precise structural analysis of glass and metallic oxide nanoparticles, characterization techniques using high-energy X-rays such as X-ray absorption fine structure (XAFS) and using γ-ray such as Mössbauer spectroscopy are very effective. This Special Issue aims to present results on a molecular scale of the development of new functional oxide glass, glass–ceramics, and metallic oxide nanoparticles characterized by radiation techniques which show the future direction of new functional materials. We also envisage submissions focused on new topics utilizing new techniques related to radioisotope to evaluate chemical or physical reactions accurately. Contributions relevant to inorganic material sciences and radiation sciences are encouraged.

Dr. Shiro Kubuki
Guest Editor

Manuscript Submission Information

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  • precise structural analysis
  • functional oxide glass
  • metallic oxide nanoparticles
  • electrical conductivity
  • optical property
  • magnetic property
  • XAFS
  • Mössbauer spectroscopy

Published Papers (1 paper)

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27 pages, 5860 KiB  
Debye Temperature Evaluation for Secondary Battery Cathode of α-SnxFe1−xOOH Nanoparticles Derived from the 57Fe- and 119Sn-Mössbauer Spectra
by Ahmed Ibrahim, Kaoru Tani, Kanae Hashi, Bofan Zhang, Zoltán Homonnay, Ernő Kuzmann, Arijeta Bafti, Luka Pavić, Stjepko Krehula, Marijan Marciuš and Shiro Kubuki
Int. J. Mol. Sci. 2024, 25(5), 2488; https://doi.org/10.3390/ijms25052488 - 20 Feb 2024
Cited by 1 | Viewed by 606
Debye temperatures of α-SnxFe1−xOOH nanoparticles (x = 0, 0.05, 0.10, 0.15 and 0.20, abbreviated as Sn100x NPs) prepared by hydrothermal reaction were estimated with 57Fe- and 119Sn-Mössbauer spectra measured by varying the temperature [...] Read more.
Debye temperatures of α-SnxFe1−xOOH nanoparticles (x = 0, 0.05, 0.10, 0.15 and 0.20, abbreviated as Sn100x NPs) prepared by hydrothermal reaction were estimated with 57Fe- and 119Sn-Mössbauer spectra measured by varying the temperature from 20 to 300 K. Electrical properties were studied by solid-state impedance spectroscopy (SS-IS). Together, the charge–discharge capacity of Li- and Na-ion batteries containing Sn100x NPs as a cathode were evaluated. 57Fe-Mössbauer spectra of Sn10, Sn15, and Sn20 measured at 300 K showed only one doublet due to the superparamagnetic doublet, while the doublet decomposed into a sextet due to goethite at the temperature below 50 K for Sn 10, 200 K for Sn15, and 100 K for Sn20. These results suggest that Sn10, Sn15 and Sn20 had smaller particles than Sn0. On the other hand, 20 K 119Sn-Mössbauer spectra of Sn15 were composed of a paramagnetic doublet with an isomer shift (δ) of 0.24 mm s−1 and quadrupole splitting (∆) of 3.52 mm s−1. These values were larger than those of Sn10 (δ: 0.08 mm s−1, ∆: 0.00 mm s−1) and Sn20 (δ: 0.10 mm s−1, ∆: 0.00 mm s−1), suggesting that the SnIV-O chemical bond is shorter and the distortion of octahedral SnO6 is larger in Sn15 than in Sn10 and Sn20 due to the increase in the covalency and polarization of the SnIV-O chemical bond. Debye temperatures determined from 57Fe-Mössbauer spectra measured at the low temperature were 210 K, 228 K, and 250 K for Sn10, Sn15, and Sn20, while that of α-Fe2O3 was 324 K. Similarly, the Debye temperature of 199, 251, and 269 K for Sn10, Sn15, and Sn20 were estimated from the temperature-dependent 119Sn-Mössbauer spectra, which were significantly smaller than that of BaSnO3 (=658 K) and SnO2 (=382 K). These results suggest that Fe and Sn are a weakly bound lattice in goethite NPs with low crystallinity. Modification of NPs and addition of Sn has a positive effect, resulting in an increase in DC conductivity of almost 5 orders of magnitude, from a σDC value of 9.37 × 10−7 (Ω cm)−1 for pure goethite Sn (Sn0) up to DC plateau for samples containing 0.15 and 0.20 Sn (Sn15 and Sn20) with a DC value of ~4 × 10−7 (Ω cm)−1 @423 K. This non-linear conductivity pattern and levelling at a higher Sn content suggests that structural modifications have a notable impact on electron transport, which is primarily governed by the thermally activated via three-dimensional hopping of small polarons (SPH). Measurements of SIB performance, including the Sn100x cathode under a current density of 50 mA g−1, showed initial capacities of 81 and 85 mAh g−1 for Sn0 and Sn15, which were larger than the others. The large initial capacities were measured at a current density of 5 mA g−1 found at 170 and 182 mAh g−1 for Sn15 and Sn20, respectively. It is concluded that tin-goethite NPs are an excellent material for a secondary battery cathode and that Sn15 is the best cathode among the studied Sn100x NPs. Full article
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