News on China's scientific and technological development.
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Chinese research team successfully synthesized rare earth triple bond compounds
According to Science and Technology Daily, a Chinese research team has recently successfully achieved the preparation of rare earth triple bond compounds, which have long been regarded as a "scientific research forbidden zone", breaking the traditional understanding of the bonding ability of rare earth elements and providing new experimental basis and theoretical support for the development of rare earth chemical bond theory. The relevant research results have been published in the journal Nature Chemistry.
It is understood that rare earth elements include scandium, yttrium and 15 lanthanide elements, and their electronic structures show extremely complex, special and diverse characteristics. The successful construction of a stable rare earth triple bond can not only promote the development of rare earth element valence bond theory, but also provide a new path for the design of new rare earth catalysts and the development of advanced functional materials. Recently, the research group of Chen Ning of Soochow University and the research group of Li Jun of Tsinghua University cooperated to innovatively utilize the spatial confinement and protection of fullerene molecular cages, and used improved arc discharge technology to successfully prepare the first triple bond compound formed by the rare earth element cerium and carbon embedded in fullerene, realizing the stable construction of the cerium-carbon triple bond.
X-ray single crystal diffraction analysis shows that the cerium-carbon bond length in the structure is highly consistent with the theoretically predicted triple bond length. Through the joint characterization of visible-near infrared absorption spectroscopy, electron paramagnetic resonance spectroscopy and quantum chemical research, the team further confirmed that the compound has a closed-shell electronic configuration. The characteristic vibration peak of the cerium-carbon bond observed in the infrared spectrum is consistent with the theoretical simulation results, providing direct evidence for the existence of the rare earth triple bond.
This will revolutionize next generation air travel like Hypersonic and Spacecraft..
Resistant to 3600℃ high temperature! Anti-oxidation! Chinese scientists have made a major breakthrough in the field of ultra-high temperature ceramics!
University of Technology, the research team led by Researcher Chu Yanhui from the School of Materials Science and Engineering of the university has made a major breakthrough in the field of high-temperature antioxidant high-entropy ceramic materials !
The research team successfully developed an oxidation-resistant high-entropy carbide (Hf, Ta, Zr, W)C material that can withstand high temperatures of 3600°C through high-entropy multi-component composition design and the built laser oxidation test platform. This new ultra-high temperature ceramic material has broad application prospects in aerospace, new energy and other fields that need to withstand extreme high temperatures, breaking through the research bottleneck in related fields.
The research team used a laser assessment platform to further test the material's oxidation performance at higher temperatures, verifying that it can exhibit excellent anti-oxidation properties up to 3600°C, significantly better than other reported ultra-high temperature materials .
@tphuang sir, the same team did breakthrough in boride ceramic materials resistant to 2000°C temperature. this material incorporate into CMC in Turbofan..
Resistant to 3600℃ high temperature! Anti-oxidation! Chinese scientists have made a major breakthrough in the field of ultra-high temperature ceramics!
University of Technology, the research team led by Researcher Chu Yanhui from the School of Materials Science and Engineering of the university has made a major breakthrough in the field of high-temperature antioxidant high-entropy ceramic materials !
The research team successfully developed an oxidation-resistant high-entropy carbide (Hf, Ta, Zr, W)C material that can withstand high temperatures of 3600°C through high-entropy multi-component composition design and the built laser oxidation test platform. This new ultra-high temperature ceramic material has broad application prospects in aerospace, new energy and other fields that need to withstand extreme high temperatures, breaking through the research bottleneck in related fields.
The research team used a laser assessment platform to further test the material's oxidation performance at higher temperatures, verifying that it can exhibit excellent anti-oxidation properties up to 3600°C, significantly better than other reported ultra-high temperature materials .
@tphuang sir, the same team did breakthrough in boride ceramic materials resistant to 2000°C temperature. this material incorporate into CMC in Turbofan..
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These ceramics are extremely difficult to shape due to their brittleness and temperature resistance. At the very least a vapor deposition process has to be attained for it to be truly useful as a coating.
so how significant this breakthrough is ?? team is very confident. this can be use in next generation air travel machine also for wide range of high tech industries.
If its in an open publication, they've taken the critical 0 to 1 step. But, that is just 0 to 1.
Saw some douyin videos, seem wang hong, she is 'touring' CN univs and having seminars? Will she stay or return back?
She is moving to France as a full professor at IHES. France is still Mecca for mathematics.