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Updated: May 17, 2026

Quantification of Hydrogen Concentrations in Surface and Interface Layers and Bulk Materials through Depth Profiling with Nuclear Reaction Analysis
Published on: March 29, 2016
Structural parameters of Pr3MgNi14 during hydrogen absorption-desorption process.
Kenji Iwase1, Naoyoshi Terashita, Kazuhiro Mori
1Frontier Research Center for Applied Sciences, Ibaraki University, 162-1 Shirakata, Tokai, Naka, Ibaraki 319-1106, Japan. fbiwase@mx.ibaraki.ac.jp
Pr(3)MgNi(14) exhibits excellent hydrogen storage capacity and cyclic stability, retaining 87.5% capacity after 1000 cycles. Its metal sublattice shows anisotropic expansion, with lattice strains significantly lower than LaNi(5).
Area of Science:
- Materials Science
- Hydrogen Storage Technologies
- Solid-State Chemistry
Background:
- Hydrogen storage materials are crucial for clean energy applications.
- Pr(3)MgNi(14) is a potential candidate for hydrogen storage.
- Understanding its structural behavior under cyclic conditions is essential.
Purpose of the Study:
- To investigate the structural evolution of Pr(3)MgNi(14) during hydrogen absorption-desorption cycles.
- To evaluate its hydrogen storage capacity and cyclic performance.
- To compare its stability with established materials like LaNi(5).
Main Methods:
- X-ray diffraction (XRD) was used to analyze structural parameters.
- Pressure-composition (P-C) isotherms were measured to determine hydrogen capacity.
- Cyclic hydrogen absorption-desorption tests were conducted up to 1000 cycles.
- Rietveld analysis was employed to refine lattice strains.
Main Results:
- Pr(3)MgNi(14) comprises Gd(2)Co(7)-type (80%) and PuNi(3)-type (20%) structures.
- Maximum hydrogen capacity was 1.12 H/M (1.61 mass %) at 298 K.
- Retention rate was 87.5% after 1000 cycles at 313 K, outperforming LaNi(5).
- Anisotropic expansion of the metal sublattice was observed, with lattice strains significantly lower than LaNi(5).
Conclusions:
- Pr(3)MgNi(14) demonstrates promising hydrogen storage properties and superior cyclic stability.
- The material's low lattice strain suggests good structural integrity during cycling.
- Its performance indicates potential for practical hydrogen storage applications.
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