The f-ratio model for quantitative X-ray microanalysis

Teng, Chaoyi; Gauvin, Raynald

doi:10.1016/j.talanta.2021.122765

Cited by 7 publications

(3 citation statements)

References 19 publications

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“…1 and Fig. 2 is shown in Table 3, which is very close to the theoretical value [26]. However, elemental segregation is clearly observed in the EDS elemental mappings of HE-10, HE-11 and HE-12.…”

Section: Characterizationsupporting

confidence: 82%

Influence of average radii of RE³⁺ions on phase structures and thermal expansion coefficients of high-entropy pyrosilicates

Chen¹,

Lin²,

Zheng³

et al. 2023

Journal of Advanced Ceramics

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High-entropy pyrosilicate element selection is relatively blind, and the thermal expansion 2 coefficient of traditional β-type pyrosilicate is not adjustable, making it difficult to meet the requirements of various types of ceramic matrix composites. The following study aimed to develop a universal rule for high-entropy pyrosilicate element selection and to achieve directional control of the thermal expansion coefficient of high-entropy pyrosilicate. The current study investigates a highentropy design method for obtaining pyrosilicates with stable β-phase and γ-phase by introducing various rare earth (RE) cations. The solid-phase method was used to create twelve different types of high-entropy pyrosilicates with 4-6 components. The high-entropy pyrosilicates gradually transformed from β-phase to γ-phase with an increase in the average radius of RE 3+ ions. The nine pyrosilicates with a small average radius of RE 3+ ions preserve β-phase or γ-phase stability at room temperature to the maximum of 1400 °C. The intrinsic relationship between the thermal expansion coefficient, phase structure, and RE-O bond length has also been found. This study provides the theoretical background for designing high-entropy pyrosilicates from the perspective of the average radius of RE 3+ ions. The theoretical guidance makes it easier to synthesize high-entropy pyrosilicates with stable β-phase or γ-phase for use in environmental barrier coatings. The thermal expansion coefficient of γ-type high-entropy pyrosilicate can be altered through component design to match various types of ceramic matrix composites.

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Section: Characterizationsupporting

confidence: 82%

Influence of average radii of RE³⁺ions on phase structures and thermal expansion coefficients of high-entropy pyrosilicates

Chen¹,

Lin²,

Zheng³

et al. 2023

Journal of Advanced Ceramics

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“…The data were determined as the average of three EDS point scan data. 17 We found that as the atomic number of the REEs increased, the proportion of lanthanide RE elements (except yttrium) gradually increased in CMAS; however, the content of REEs in apatite gradually decreased. As the atomic number of Y differs greatly from that of other RE elements, the results of the EDS quantitative analysis of the Y element are not very precise.…”

Section: Compositions and The Thickness Of Apatite And Residual Meltmentioning

confidence: 69%

Mechanism of enhanced corrosion resistance against molten CMAS for pyrosilicates by high‐entropy design

et al. 2023

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Meeting service requirements at temperatures above 1400°C is challenging for the CMAS corrosion resistance of single‐component pyrosilicates. This research presents a high‐entropy design approach for pyrosilicates using ionic radius modulation. This method enhances pyrosilicates’ resistance to CMAS corrosion by regulating the apatite's quantity formed to obstruct CMAS melt infiltration while avoiding excessive reactions. We investigated the corrosion behavior of two types of single‐component pyrosilicates (Lu2Si2O7 and Yb2Si2O7) with a small ionic radius of rare‐earth elements (REEs), three types of β‐type pyrosilicates ((Ho1/4Er1/4Yb1/4Lu1/4)2Si2O7, (Y1/5Ho1/5Er1/5Yb1/5Lu1/5)2Si2O7 and (Y1/6Ho1/6Er1/6Tm1/6Yb1/6Lu1/6)2Si2O7), and one γ‐type pyrosilicate ((Gd1/4Dy1/4Yb1/4Lu1/4)2Si2O7) with a larger average ionic radius of REEs at 1450–1550°C. The analysis of the residual CMAS and apatite compositions showed the differences in the behavior of different REEs in the reaction with CMAS and the conditions required for the reaction to proceed.

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“…The concentration in atoms is normalized by representing the f -ratio for each element. This is a relatively new quantitative X-ray microanalysis method that gives the composition of a sample [19]. In addition, samples can be easily compared between them.…”

Section: Physical Characterizations Of LI Foilsmentioning

confidence: 99%

Method for Benchmarking Li Metal Anodes: A Mandatory Step toward Reliable Lithium Metal Batteries

et al. 2023

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All-solid-state batteries are known to be the new energy storage holy grail that will lead to safer batteries with higher energy density than current Li-ion batteries. The use of a solid electrolyte enables the use of lithium metal as the anode material. However, its composition, its thickness, and the quality/nature of its passivation layer can strongly affect the performance of the battery. For this reason, we propose a simple benchmarking method that evaluates and compares the quality and electrochemical performance of various Li anodes. This method can be easily reproduced, especially concerning the electrochemical evaluation that uses a commercial liquid electrolyte and the widely spread coin-cell format. In total, ~285 coin cells were assembled to benchmark our in-house lithium metal foil (Lithium HQ) with two commercial ones and the results showed the superior performance of our Li metal anode. The performance of the cells seems closely related to the quality and uniformity of the Li surface. In addition, we propose including in the benchmarking method the effect of Li aging in a dry room on the electrochemical performance. This effect is important to consider because the fabrication of all-solid-state batteries is conducted in such an environment.

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The f-ratio model for quantitative X-ray microanalysis

Cited by 7 publications

References 19 publications

Influence of average radii of RE³⁺ions on phase structures and thermal expansion coefficients of high-entropy pyrosilicates

Influence of average radii of RE³⁺ions on phase structures and thermal expansion coefficients of high-entropy pyrosilicates

Mechanism of enhanced corrosion resistance against molten CMAS for pyrosilicates by high‐entropy design

Method for Benchmarking Li Metal Anodes: A Mandatory Step toward Reliable Lithium Metal Batteries

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The f-ratio model for quantitative X-ray microanalysis

Cited by 7 publications

References 19 publications

Influence of average radii of RE3+ions on phase structures and thermal expansion coefficients of high-entropy pyrosilicates

Influence of average radii of RE3+ions on phase structures and thermal expansion coefficients of high-entropy pyrosilicates

Mechanism of enhanced corrosion resistance against molten CMAS for pyrosilicates by high‐entropy design

Method for Benchmarking Li Metal Anodes: A Mandatory Step toward Reliable Lithium Metal Batteries

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Influence of average radii of RE³⁺ions on phase structures and thermal expansion coefficients of high-entropy pyrosilicates

Influence of average radii of RE³⁺ions on phase structures and thermal expansion coefficients of high-entropy pyrosilicates