High pressure
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High Pressure: A New Frontier in Material Science and Technology
Introduction to High Pressure in Material Science
High pressure is a fundamental thermodynamic variable that significantly influences the properties of materials by reducing interatomic distances and modifying electronic orbitals and bonding patterns. This unique capability makes high pressure a versatile tool for creating exotic materials that are not accessible under ambient conditions . Recent advancements in high-pressure experimental techniques have led to the synthesis of numerous functional materials, including superconductors, superhard materials, and high-energy-density materials .
High-Pressure Techniques and Discoveries
Static and Dynamic High-Pressure Techniques
The development of megabar diamond anvil cells and associated synchrotron techniques has revolutionized high-pressure research, enabling the exploration of materials under extreme conditions . These techniques have opened up a new dimension in condensed-matter physics, revealing surprising high-pressure phenomena and creating novel materials . Dynamic high-pressure methods, capable of achieving pressures up to 500 GPa, have further expanded the scope of high-pressure research, allowing the study of materials under conditions that mimic those found in the interiors of giant planets .
Record-Breaking Superconductors
One of the most notable achievements in high-pressure research is the discovery of record high-temperature superconductivity in hydrogen sulfide (H3S) and lanthanum hydride (LaH10), with critical temperatures of 200 K and 260 K, respectively . These discoveries were facilitated by first-principles crystal-structure searching simulations, which have become essential tools in the design and synthesis of new high-pressure materials Zhang2017Xu2021.
High-Pressure Effects on Material Properties
Alteration of Chemical Bonds and Electronic States
High pressure can drastically alter the chemical bonds and electronic states of materials, leading to the formation of new compounds with unconventional stoichiometries and exotic physical and chemical properties . For instance, pressure can activate core electrons and non-valence orbitals, resulting in the stabilization of homonuclear bonds and the formation of novel chemical species . This has led to the discovery of new solid-state chemistries, such as the polymerized covalently bonded structures of light-element gas molecules like CO2 and N2 under high pressure .
Phase Transitions and Novel States
High pressure induces phase transitions and chemical reactions that are not observed under ambient conditions. These transitions can lead to the formation of new classes of materials with unique properties, such as the metallization of fluid hydrogen and the pressure-induced superconductivity in topological insulators Mao2018Hemley2000. Additionally, high pressure can tune vibrational dynamics, quantum effects, and excited electronic states, further expanding the range of material properties that can be explored .
Applications and Future Directions
Industrial and Technological Applications
High-pressure synthesis is already applied on an industrial scale to produce synthetic diamonds and cubic boron nitride, which are essential for cutting and shaping hard metals and ceramics . The unique properties of high-pressure materials also hold promise for various technological applications, including the development of high-energy-density materials and novel electronic devices Zhang2017Xu2021.
Biotechnology and Food Science
Beyond material science, high pressure has found applications in biotechnology and food science. It is used to disaggregate proteins, prepare viral vaccines, and modulate food functionality, offering potential health benefits such as improved digestibility and reduced allergenicity Pottier2017Nellis2006.
Conclusion
High pressure offers a unique degree of freedom for the creation of new materials with unprecedented properties. The advancements in high-pressure techniques and theoretical methods have led to significant discoveries, including record-breaking superconductors and novel chemical species. As research continues to explore the vast potential of high-pressure science, we can expect further breakthroughs that will impact various fields, from condensed-matter physics to biotechnology and beyond.
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