Phase transformation by a step-growth mechanism in annealed La–Mg–Ni-based layered-stacking alloys

Li, Yiming; Liu, Zhuocheng; Zhang, Guofang; Zhang, Yanghuan; Ren, Huiping

doi:10.1016/j.jallcom.2020.154282

Cited by 6 publications

(2 citation statements)

References 46 publications

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“…Therefore, the atom will fill position 4, whereas the other position is empty, which leads to the appearance of steps, as exhibited in Figure 11. The subsequent position is filled continuously, and this interface will be filled finally 46,47 . Then, depending on the fluctuation of structure and energy in the liquid phase, the atomic clusters of a certain size fall on a new interface and form the secondary crystal nucleus.…”

Section: Resultsmentioning

confidence: 99%

Effects of sintering temperature on microstructure and properties of low‐grade bauxite‐based ceramic proppant

Ding

Fang

Xiao

et al. 2021

Int J Applied Ceramic Tech

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Low density and high strength ceramic proppant was prepared by sintering high aluminium type low‐grade bauxite and high iron type low‐grade bauxite at the temperature range from 1300℃ to 1360℃. The phase composition and micromorphology of ceramic proppant were, respectively, characterized by X‐ray diffraction (XRD) and scanning electron microscope (SEM). The bulk density, apparent density, and breakage ratio of ceramic proppant were tested using standard methods. The results show that mullite crystal and corundum crystal are fully developed, the spatial network structure of rod‐shaped mullite is formed, and corundum crystal is evenly distributed in the sample when the sintering temperature is 1340℃. At this temperature, the bulk density of the sample is 1.42 g/cm3, the apparent density is 2.67 g/cm3, and the breakage ratio is 5.1% under the closure pressure of 52 MPa. Then, the growth mechanism of mullite crystal in ceramic proppant was explored. The results reveal that the mullite crystal in ceramic proppant conforms to the layer growth theory. The secondary crystal nucleus is formed in the growth process and shows a step growth mechanism. With the increase in sintering temperature, the preferred orientation growth of mullite crystal finally forms needle‐like morphology.

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Section: Resultsmentioning

confidence: 99%

Effects of sintering temperature on microstructure and properties of low‐grade bauxite‐based ceramic proppant

Ding

Fang

Xiao

et al. 2021

Int J Applied Ceramic Tech

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show abstract

“…To solve some of these issues, new manufacturing techniques such as smelting protection with helium gas [20,23], sintering techniques [24,25], ball milling [26] or other processing techniques [23,27] have been proposed. These are however either very expensive and/or are highly complicated processes.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Y Content on Structural and Sorption Properties of A2B7-Type Phase in the La–Y–Ni–Al–Mn System

et al. 2023

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Metal hydrides are an interesting group of chemical compounds, able to store hydrogen in a reversible, compact and safe manner. Among them, A2B7-type intermetallic alloys based on La-Mg-Ni have attracted particular attention due to their high electrochemical hydrogen storage capacity (∼400 mAh/g) and extended cycle life. However, the presence of Mg makes their synthesis via conventional metallurgical routes challenging. Replacing Mg with Y is a viable approach. Herein, we present a systematic study for a series of compounds with a nominal composition of La2-xYxNi6.50Mn0.33Al0.17, x = 0.33, 0.67, 1.00, 1.33, 1.67, focusing on the relationship between the material structural properties and hydrogen sorption performances. The results show that while the hydrogen-induced phase amorphization occurs in the Y-poor samples (x < 1.00) already during the first hydrogen absorption, a higher Y content helps to maintain the material crystallinity during the hydrogenation cycles and increases its H-storage capacity (1.37 wt.% for x = 1.00 vs. 1.60 wt.% for x = 1.67 at 50 °C). Thermal conductivity experiments on the studied compositions indicate the importance of thermal transfer between powder individual particles and/or a measuring instrument.

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Annealing temperature-dependent phase structure and electrochemical hydrogen storage properties of AB4-type La1.5Y1.5Ni12-Mn (x = 0, 1.0) superlattice alloys

Wan

Zhao²,

Wang³

et al. 2023

International Journal of Hydrogen Energy

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Phase transformation by a step-growth mechanism in annealed La–Mg–Ni-based layered-stacking alloys

Cited by 6 publications

References 46 publications

Effects of sintering temperature on microstructure and properties of low‐grade bauxite‐based ceramic proppant

Effects of sintering temperature on microstructure and properties of low‐grade bauxite‐based ceramic proppant

The Effect of Y Content on Structural and Sorption Properties of A2B7-Type Phase in the La–Y–Ni–Al–Mn System

Annealing temperature-dependent phase structure and electrochemical hydrogen storage properties of AB4-type La1.5Y1.5Ni12-Mn (x = 0, 1.0) superlattice alloys

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