Unusual hydrogen implanted gold with lattice contraction at increased hydrogen content
Khac Thuan Nguyen1, Van Hiep Vuong2, The Nghia Nguyen2
1Faculty of Engineering and Nanotechnology, VNU-University of Engineering and Technology, 144 Xuan Thuy, Cau Giay, Ha Noi, Vietnam.
Nature Communications
|March 11, 2021
Summary
Low-dose hydrogen implantation causes gold to contract, an unusual solid-state phenomenon. This volume contraction is attributed to dynamic hydride bond formation within the gold lattice.
Area of Science:
- Solid-state physics
- Materials science
- Chemistry
Background:
- Volume contraction in solids upon element addition is rare.
- Previous explanations based solely on kinetic theory are insufficient for hydrogen-gold interactions.
Purpose of the Study:
- To present experimental evidence of gold volume contraction after hydrogen implantation.
- To elucidate the underlying physics of hydrogen-gold interactions at the lattice level.
Main Methods:
- Experimental implantation of hydrogen into gold.
- Analysis of lattice volume changes.
- Theoretical investigation of hydrogen-lattice interactions.
Main Results:
- Observed significant volume contraction of gold at low hydrogen doses.
- Identified the formation of dynamic hydride bonds as the primary mechanism.
- Demonstrated that these bonds weaken at higher doses, leading to expansion.
Conclusions:
- Dynamic hydride bond formation explains the anomalous volume contraction in hydrogen-implanted gold.
- The dose-dependent weakening of these bonds accounts for the transition to volume expansion.
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