Open Access
Scientific Reports, volume 10, issue 1, publication number 8037
Mechanical and electronic properties of van der Waals layered hcp PdH2
2
Publication type: Journal Article
Publication date: 2020-05-15
PubMed ID:
32415156
Multidisciplinary
Abstract
Mechanical and electronic properties of palladium dihydrides (PdH2) as a function of pressure were studied by ab initio calculations based on density functional theory (DFT). The ab initio random structure searching technique was employed for screening potential PdH2 crystal structures under high pressure. A hexagonal close packed (hcp) phase of PdH2 with space group P63mc was reported. The structure geometry and elastic constants were calculated as a function of pressure. It was found that H atoms are in the interstitial position of Pd atoms layer at 0 GPa. There is an electronic topology transition of hcp PdH2 at 15 GPa. When pressure exceeds above 15 GPa, one hydrogen atom occupies the tetrahedral site and another hydrogen atom locates in the interstitial position. When the c/a ratio is between 1.765 to 1.875, the hcp PdH2 is mechanically stable, and the Pd-H2b bond is the major factor that limits the mechanical stability. The elastic constant C44 is the first one that cannot satisfy the mechanical stability criteria under pressure. The anisotropy parameters are far from 1(one) shows that the hcp PdH2 is a highly anisotropic structure. The electronic structure study indicates that the bonding force between Pd and H atoms along the z-axis direction increases with the increasing pressure. Also, the phonon dispersion study shows that PdH2 is dynamic stability under pressure. The results suggest that hcp PdH2 can be metastable in van der Waals layered structure.
Citations by journals
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1
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Materials Today
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Materials Today
1 publication, 33.33%
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International Journal of Hydrogen Energy
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International Journal of Hydrogen Energy
1 publication, 33.33%
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Frontiers in Materials
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Frontiers in Materials
1 publication, 33.33%
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1
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Citations by publishers
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1
2
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Elsevier
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Elsevier
2 publications, 66.67%
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Frontiers Media S.A.
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Frontiers Media S.A.
1 publication, 33.33%
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1
2
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Liu Z. et al. Mechanical and electronic properties of van der Waals layered hcp PdH2 // Scientific Reports. 2020. Vol. 10. No. 1. 8037
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Liu Z., AHUJA R., Li H., Luo W. Mechanical and electronic properties of van der Waals layered hcp PdH2 // Scientific Reports. 2020. Vol. 10. No. 1. 8037
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TY - JOUR
DO - 10.1038/s41598-020-61385-5
UR - https://doi.org/10.1038%2Fs41598-020-61385-5
TI - Mechanical and electronic properties of van der Waals layered hcp PdH2
T2 - Scientific Reports
AU - Liu, Zeliang
AU - AHUJA, RAJEEV
AU - Li, Huijian
AU - Luo, Wei
PY - 2020
DA - 2020/05/15 00:00:00
PB - Springer Nature
IS - 1
VL - 10
PMID - 32415156
SN - 2045-2322
ER -
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@article{2020_Liu,
author = {Zeliang Liu and RAJEEV AHUJA and Huijian Li and Wei Luo},
title = {Mechanical and electronic properties of van der Waals layered hcp PdH2},
journal = {Scientific Reports},
year = {2020},
volume = {10},
publisher = {Springer Nature},
month = {may},
url = {https://doi.org/10.1038%2Fs41598-020-61385-5},
number = {1},
doi = {10.1038/s41598-020-61385-5}
}