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Synthesis and Microdiffraction at Extreme Pressures and Temperatures
Published on: October 7, 2013
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High-Pressure Synthesis of Metastable Superhydride PdH3 by Using Amorphous Pd as a Starting Material.
Chuang Liu1,2, Kun Shi1, Yiyao Ge3
1State Key Laboratory of High Pressure and Superhard Materials, College of Physics, Jilin University, Changchun 130012, China.
ACS Nano
|September 1, 2025
Summary
Researchers synthesized a novel metastable palladium trihydride (PdH3) superhydride using amorphous palladium nanoparticles under high pressure. This breakthrough offers a new route to high-hydrogen-ratio metal hydrides for potential superconductivity applications.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Superconductivity
Background:
- High-pressure synthesis is crucial for discovering metal superhydrides with unique superconducting properties.
- Synthesizing metastable metal hydrides remains a significant challenge despite theoretical predictions.
Purpose of the Study:
- To develop a reliable method for fabricating metastable metal hydrides with high hydrogen content.
- To investigate the role of starting material structure in high-pressure synthesis of palladium hydrides.
Main Methods:
- High-pressure and high-temperature synthesis using amorphous and crystalline palladium nanoparticles.
- Characterization of synthesized palladium hydrides under ambient conditions.
- Theoretical calculations to understand the formation mechanism.
Main Results:
- Successfully synthesized metastable palladium trihydride (PdH3) superhydride from amorphous Pd nanoparticles at ~32.2 GPa and ~2000 K.
- Obtained PdH1.3, an ambient-stable palladium hydride with the highest reported hydrogen ratio, after pressure release.
- Synthesized Pd3H5 from crystalline Pd nanoparticles, which transformed to PdH0.706 upon quenching.
Conclusions:
- The disordered atomic arrangement and high entropy of amorphous palladium nanoparticles are critical for forming metastable PdH3.
- This study provides valuable insights into preparing metastable metal hydrides with high hydrogen ratios for applications like superconductivity.
