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High-Pressure Behavior of Nano-Pt in Hydrogen Environment
Abstract:We choose nano-Pt in hydrogen environment to explore the size effect on the formation of metal hydrides.At30 GPa,a phase transition in the metal lattice from the cubic to hexagonal phase is observed characterized by a drastically increased volume per metal atom,indicating the formation of PtH-P6_3/mmc.We find that nano-Pt could form PtH at a lower pressure than the bulk Pt due to its high specific surface and structure defects.The present work provides the possible route to new metal hydrides under mild conditions.
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