Diffusion: Introduction and Case Studies in Metals and Binary Alloys

Mehrer, H.

doi:10.1007/3-540-30970-5_1

Cited by 22 publications

(15 citation statements)

References 63 publications

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“…Methods for studying diffusion in solids. [204,279] Macroscopic Microscopic Nuclear tracer diffusion NMR relaxation β -radiation-detected NMR field gradient NMR quasielastic neutron scattering mössbauer spectroscopy Non-nuclear DC conductivity AC conductivity mechanical relaxation 4.3.1. Direct methods [280] The tracer method is the most direct and accurate technique to determine the (self-or impurity) diffusion coefficient in solids.…”

Section: Lithium-ion Conductivity and Diffusion Coefficientmentioning

confidence: 99%

Lithium-ion transport in inorganic solid state electrolyte

et al. 2016

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An overview of ion transport in lithium-ion inorganic solid state electrolytes is presented, aimed at exploring and designing better electrolyte materials. Ionic conductivity is one of the most important indices of the performance of inorganic solid state electrolytes. The general definition of solid state electrolytes is presented in terms of their role in a working cell (to convey ions while isolate electrons), and the history of solid electrolyte development is briefly summarized. Ways of using the available theoretical models and experimental methods to characterize lithium-ion transport in solid state electrolytes are systematically introduced. Then the various factors that affect ionic conductivity are itemized, including mainly structural disorder, composite materials and interface effects between a solid electrolyte and an electrode. Finally, strategies for future material systems, for synthesis and characterization methods, and for theory and calculation are proposed, aiming to help accelerate the design and development of new solid electrolytes.

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Section: Lithium-ion Conductivity and Diffusion Coefficientmentioning

confidence: 99%

Lithium-ion transport in inorganic solid state electrolyte

et al. 2016

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“…The preservation of the nanocrystalline structure of the intermetallic phase, during consolidation at high temperatures, is due to the use of high pressing pressure, as we have shown previously [7,8]. Since diffusion is involved in grain growth, the influence of pressure apparently comes from the fact that the diffusion coefficient decreases with the increase in pressure, usually by a factor ranging from 2 to 10 for a pressure of 1 GPa [23]. Hence, the use of high pressure during consolidation can reduce the mobility of grain boundaries at high temperature.…”

Section: Resultsmentioning

confidence: 75%

Al13Fe4-Al Composites with Nanocrystalline Matrix Manufactured by Hot-Pressing of Milled Powders

2022

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The paper describes composites with the matrix containing a nanocrystalline intermetallic Al13Fe4 phase and microcrystalline aluminium. Mechanically alloyed Al80Fe20 powder, containing a metastable nanocrystalline Al5Fe2 phase, was mixed with 20, 30, and 40 vol.% of Al powder and consolidated at 750 °C under the pressure of 7.7 GPa. During the consolidation, the metastable Al5Fe2 phase transformed into a nanocrystalline Al13Fe4 phase. In the bulk samples, Al13Fe4 areas were wrapped around by networking Al regions. The hardness of the Al13Fe4-Al composites was in the range of 4.52–5.50 GPa. The compressive strength of the Al13Fe4-30%Al and Al13Fe4-40%Al composites was 805 and 812 MPa, respectively, and it was considerably higher than that of the Al13Fe4-20%Al composite (538 MPa), which failed in the elastic region. The Al13Fe4-30%Al and Al13Fe4-40%Al composites, in contrast, showed some plasticity: namely, 1.5% and 9.1%, respectively. The density of the produced composites is in the range of 3.27–3.48 g/cm3 and decreases with the increase in the Al content.

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“…The value measured for the enthalpy of absorption, Δ , for this material using the following expression (see Figure ) in linear form, that is was Δ = (3.6 ± 0.5) eV, and the linear regression coefficient was r 2 = 0.93. It is necessary at this point to affirm that positive values for the enthalpy of absorption are possible in metals and oxides …”

Section: Resultsmentioning

confidence: 99%

Absorption Kinetics of Hydrogen In Nanocrystals of BaCe_0.95Yb_0.05O₃_-_δProton-Conducting Perovskite

2007

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Powders of BaCe 0.95 Yb 0.05 O 3-δ were synthesized using the standard solid-state reaction method. The produced materials were characterized by XRD, SEM, and Raman spectrometry. The absorption kinetics of hydrogen was studied using the TA-TQ500 TGA. The XRD study established the following: the phase composition, cell parameters, and crystallite size. The SEM investigation allowed us to confirm the crystallite size. The Raman study permitted us to confirm the sample phase composition. The absorption study revealed higher absorption magnitudes than those possible if we consider that the proton can only be located in the oxide anions of the perovskite. To explain these results, we proposed that at high temperature the proton could be interstitially located in tetrahedral and octahedral sites because of the increment with temperature of electrons in the conduction band during hydrogen absorption. The enthalpy of absorption, ∆H ab 0 , was measured, and it was found that ∆H ab 0 ) 3.6 eV, a positive value in agreement with the increase with temperature of electrons in the conduction band. Besides, the chemical and self-diffusion coefficients were computed. Subsequently, were calculated the activation energy, E a , and the pre-exponential factor, D 0 / , using the self-diffusion data.The values obtained were E a ) 1.6 eV and D 0 / ) 0.5 × 10 -9 m 2 /s.

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Diffusion: Introduction and Case Studies in Metals and Binary Alloys

Cited by 22 publications

References 63 publications

Lithium-ion transport in inorganic solid state electrolyte

Lithium-ion transport in inorganic solid state electrolyte

Al13Fe4-Al Composites with Nanocrystalline Matrix Manufactured by Hot-Pressing of Milled Powders

Absorption Kinetics of Hydrogen In Nanocrystals of BaCe_0.95Yb_0.05O₃_-_δProton-Conducting Perovskite

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Diffusion: Introduction and Case Studies in Metals and Binary Alloys

Cited by 22 publications

References 63 publications

Lithium-ion transport in inorganic solid state electrolyte

Lithium-ion transport in inorganic solid state electrolyte

Al13Fe4-Al Composites with Nanocrystalline Matrix Manufactured by Hot-Pressing of Milled Powders

Absorption Kinetics of Hydrogen In Nanocrystals of BaCe0.95Yb0.05O3-δProton-Conducting Perovskite

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Absorption Kinetics of Hydrogen In Nanocrystals of BaCe_0.95Yb_0.05O₃_-_δProton-Conducting Perovskite