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Matter and Radiation at Extremes 2023年第5期8卷 96-98页

作者： Di Peng Qiaoshi Zeng Fujun Lan Zhenfang Xing Yang Ding ho-kwang mao Center for High Pressure Science and Technology Advanced Research Shanghai 201203China Key Laboratory of Materials Physics Institute of Solid State PhysicsHFIPSChinese Academy of SciencesHefei 230031China University of Science and Technology of China Hefei 230026China Shanghai Key Laboratory of Material Frontiers Research in Extreme Environments(MFree) Shanghai Advanced Research in Physical Sciences(SHARPS)Shanghai 201203China State Key Laboratory of Superhard Materials Institute of PhysicsJilin UniversityChangchun 130012China

The recent report of superconductivity in nitrogen-doped lutetium hydride(Lu-H-N)at 294 K and 1 GPa brought hope for long-sought-after ambient-condition ***,the failure of scientists worldwide to independently reproduce these results has cast intense skepticism on this exciting *** this work,using a reliable experimental protocol,we synthesized Lu-H-N while minimizing extrinsic influences and reproduced the sudden change in resistance near room *** quantitative comparison of the temperaturedependent resistance between Lu-H-N and the pure lutetium before reaction,we were able to clarify that the drastic resistance change is most likely caused by a metal-to-poor-conductor transition rather than by ***,we also briefly discuss other issues recently raised in relation to the Lu-H-N system.

关键词： resistance superconductivity transition

Intrinsic Zero-Linear and Zero-Area Compressibilities over an Ultrawide Pressure Range within a Gear-Spring Structure

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CCS Chemistry 2022年第10期4卷 3246-3253页

作者： Dequan Jiang Ting Wen Huimin Song Zimin Jiang Chen Li Ke Liu Wenge Yang ho-kwang mao Yonggang Wang Center for High Pressure Science and Technology Advanced Research(HPSTAR) Beijing 100094 School of Materials Science and Engineering Peking UniversityBeijing 100871

Materials with zero-linear compressibility(ZLC)and zero-area compressibility(ZAC)have great promise for specific applications retaining constancy in specific directions or planes under external *** date,no more than 10 ZLC/ZAC materials have been reported,most of which have very limited working pressure ranges(<10 GPa).Herein,we report the observation of ZLC and ZAC in Li2Ti(IO3)6 with a gear-spring type structure over an ultrawide pressure range(0–40 GPa).

关键词： high pressure zero-linear/zero-area compressibilities gear-spring mechanism ultrawide pressure range

Stabilization of S_(3)O_(4) at high pressure:implications for the sulfur-excess paradox

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Science Bulletin 2022年第9期67卷 971-976,M0004页

作者： Siyu Liu Pengyue Gao Andreas Hermann Guochun Yang Jian Lu Yanming Ma ho-kwang mao Yanchao Wang These authors contributed equally to this work.a State Key Laboratory ofSuperhard Materials&International Center of Computational Method and Software College of PhysicsJilin UniversityChangchun 130012China Centre for Science at Extreme Conditions and Scottish Universities Physics Alliance School of Physics and AstronomyThe University of EdinburghEdinburgh EH93FDUK State Key Laboratory of Metastable Materials Science&Technology and Key Laboratory for Microstructural Material Physics of Hebei Province School of ScienceYanshan UniversityQinhuangdao 066004China International Center of Future Science Jilin UniversityChangchun 130012China Center for High Pressure Science and Technology Advanced Research Beijing 100094China

The amount of sulfur in SO2 discharged in volcanic eruptions exceeds that available for degassing from the erupted *** geological conun drum,known as the"sulfur excess",has been the subject of considerable interests but remains an open ***,in a systematic computational investigation of sulfur-oxygen compounds under pressure,a hitherto unknown S_(3)O_(4) compound containing a mixture of sulfur oxidation states+11 and+IV is predicted to be stable at pressures above 79 *** speculate that S_(3)O_(4) may be produced via redox reactions involving subducted S-bearing minerals(e.g.,sulfates and sulfides)with iron and goethite under high-pressure conditions of the deep lower mantle,decomposing to SO2 and S at shallow depths.S_(3)O_(4) may thus be a key intermediate in promoting decomposition of sulfates to release SO2,offering an alter native source of excess sulfur released during explosive *** findings provide a possible resolution of the"excess sulfur degassing"paradox and a viable mechanism for the exchange of S between Earth's surface and the lower mantle in the deep sulfur cycle.

关键词： Crystal structure prediction High-pressure chemistry S-bearing minerals Sulfur cycle Excess sulfur

Regulating off-centering distortion maximizes photoluminescence in halide perovskites

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National Science Review 2021年第9期8卷 60-67页

作者： Xujie Lu Constantinos Stoumpos Qingyang Hu Xuedan Ma Dongzhou Zhang Songhao Guo Justin hoffman Kejun Bu Xiaofeng Guo Yingqi Wang Cheng Ji Haijie Chen hongwu Xu Quanxi Jia Wenge Yang Mercouri G.Kanatzidis ho-kwang mao Center for High Pressure Science and Technology Advanced Research Department of Chemistry Northwestern University Department of Materials Science and Technology Voutes Campus University of Crete Center for Nanoscale Materials Argonne National Laboratory Partnership for Extreme Crystallography University of Hawaii at Manoa Department of Chemistry and Alexandra Navrotsky Institute for Experimental Thermodynamics Washington State University Earth and Environmental Sciences Division Los Alamos National LaboratoryLos Alamos Department of Materials Design and Innovation University at Buffalo The State University of New York

Metal halide perovskites possess unique atomic and electronic configurations that endow them with high defect tolerance and enable high-performance photovoltaics and optoelectronics. Perovskite light-emitting diodes have achieved an external quantum efficiency of over 20%. Despite tremendous progress,fundamental questions remain, such as how structural distortion affects the optical properties. Addressing their relationships is considerably challenging due to the scarcity of effective diagnostic tools during structural and property tuning as well as the limited tunability achievable by conventional methods. Here,using pressure and chemical methods to regulate the metal off-centering distortion, we demonstrate the giant tunability of photoluminescence (PL) in both the intensity (>20 times) and wavelength(>180 nm/GPa) in the highly distorted halide perovskites [CH3NH3GeI3, HC(NH2)2GeI3, and Cs Ge I3].Using advanced in situ high-pressure probes and first-principles calculations, we quantitatively reveal a universal relationship whereby regulating the level of off-centering distortion towards 0.2 leads to the best PL performance in the halide perovskites. By applying this principle, intense PL can still be induced by substituting CH3NH~3+with Cs~+to control the distortion in (CH3NH3)1-xCsxGeI3, where the chemical substitution plays a similar role as external pressure. The compression of a fully substituted sample of CsGe I3further tunes the distortion to the optimal value at 0.7 GPa, which maximizes the emission with a10-fold enhancement. This work not only demonstrates a quantitative relationship between structural distortion and PL property of the halide perovskites but also illustrates the use of knowledge gained from high-pressure research to achieve the desired properties by ambient methods.

关键词： halide perovskites high pressure off-centering distortion optical properties lone-pair electrons quantitative relationship

Everything you always wanted to know about metallic hydrogen but were afraid to ask

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Matter and Radiation at Extremes 2020年第3期5卷 25-30页

作者： Eugene Gregoryanz Cheng Ji Philip Dalladay-Simpson Bing Li Ross T.howie ho-kwang mao Centre for Science at Extreme Conditions and School of Physics and Astronomy University of EdinburghEdinburgh EH93FDUnited Kingdom Center for High Pressure Science and Technology Advanced Research Shanghai 201203China Key Laboratory of Materials Physics Institute of Solid State PhysicsChinese Academy of SciencesHefei 230031China

The hydrogen molecule is made from the first and lightest element in the periodic *** hydrogen gas is either compressed or cooled,it forms the simplest molecular *** solid exhibits many interesting and fundamental physical *** is believed that if the density of the solid is increased by compressing it to very high pressures,hydrogen will transform into the lightest known metal with very unusual and fascinating properties,such as room temperature superconductivity and/or *** this article,we provide a critical look at the numerous claims of hydrogen metallization and the current experimental state of affairs.

关键词： hydrogen metallic solid

Extreme Energetic Materials at Ultrahigh Pressures

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Engineering 2020年第9期6卷 1103-1107页

作者： ho-kwang mao Cheng Ji Bing Li Gang Liu Eugene Gregoryanz Center for High Pressure Science and Technology Advanced Research Beijing 100094China Centre for Science at Extreme Conditions&School of Physics and Astronomy The University of EdinburghEdinburgh EH93FDUK

含有极高能量密度的单键聚合氮和单原子金属氢,常被称为极端含能材料。虽然它们需要几百吉帕的超高压才能合成,并且难以直接应用,但是研究它们的稳定性、亚稳定性和其他基本特性,仍然对另辟蹊径寻找极端含能材料甚有价值。在100~200 GPa... 详细信息

含有极高能量密度的单键聚合氮和单原子金属氢,常被称为极端含能材料。虽然它们需要几百吉帕的超高压才能合成,并且难以直接应用,但是研究它们的稳定性、亚稳定性和其他基本特性,仍然对另辟蹊径寻找极端含能材料甚有价值。在100~200 GPa,已经发现了多种结晶态和非晶态的聚合氮。立方偏转结构聚合氮和黑磷结构聚合氮是两种特别有意思的聚合氮,它们的滞后保存现象提供了进一步探索氮应用的前景。另外,虽然金属氢被预估具有最高的能量密度,但预测只能保存皮秒(ps)的寿命和只能合成皮克(pg)的质量,还不是一个有实用可能性的材料。因此金属氢应被定位为一个兴趣导向的基础科研课题,主要聚焦压力下分子氢的晶体构造和电子结构的奇妙演化过程,即从低密度超宽能带的绝缘体,到窄能带的半导体,再到高密度的分子金属和原子金属,最后到前所未有的崭新物理态。这些挑战驱动着超高压科学和技术的持续创新和突破。

关键词：含能材料超高压聚合氮金属氢

New mineral discovery and micro-minerals study using synchrotron x-ray diffraction

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New mineral discovery and micro-minerals study using synchro...

2022 HP special volume:Interdisciplinary high pressure science and technology

2004年全国岩石学与地球动力学研讨会

作者： ho-kwang mao Russell J. Hemley Geophysical Laboratory Camegie Institution of Washington 5251 Broad Branch Rd NW Washington DC 20015

Micro-minerals occur in many geological settings within the Earth’s crust and mantle, as well as in lunar rocks, Martian meteorites and mineral inclusions in diamonds. The composition and structure of new micro-minerals provide an important source of information about the Earth and other planetary bodies. The radty and small size of natural micro-mineral samples, requires the use of a very bright and small x-ray spot. Synchrotron x-ray sources are very brilliant (～10 times more intense than a conventional laboratory X-ray source), and the beam size can be focused down to a few microns using K-B mirrors.

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Matter and Radiation at Extremes 2023年第6期8卷 1-3页

作者： ho-kwang mao Bin Chen Huiyang Gou Kuo Li Jin Liu Lin Wang hong Xiao Wenge Yang Center for High Pressure Science and Technology Advanced Research 10 Xibeiwang East RoadHaidianBeijing 100094China

High pressure science and technology is a vast area of inter-disciplinary research that encompasses the fields of physics,chem-istry,geoscience,and materials science and in which the science of ordinary matter is only a special case under ambient ***,the physical variable of force exerted on the chem-ical bonding of a material,directly controls the material’s phys-ical and chemical properties.

关键词： properties. ambient ordinary

Matter and radiation at extremes:Prospects and impacts

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Matter and Radiation at Extremes 2021年第1期6卷 3-4页

作者： Michel Koenig David Crandall ho-kwang mao Ke Lan Dieter H.H.hoffmann Weiyan Zhang Laboratoire LULI CNRSCEAEcole PolytechniqueUPMCUniv Paris 06:Sorbonne UniversitesInstitut Polytechnique de ParisF-91128 Palaiseau cedexFrance Independent Consultant Retired from United States Department of EnergyRockvilleMaryland 20850USA Center for High Pressure Science and Technology Advanced Research ShanghaiChina Institute of Applied Physics and Computational Mathematics BeijingChina Center for Applied Physics and Technology Peking UniversityBeijing100871China Xi’an Jiaotong University Xi’anChina China Academy of Engineering Physics MianyangChina

High-energy-density science(HEDS)has been recognized as a comprehensive new area of physical science,with the potential to revolutionize various scientific and technological fields,including nuclear fusion,particle acceleration,astrophysics,and the properties of condensed matter under extreme *** is why this journal,Matter and Radiation at Extremes(MRE),was established five years ago by the China Academy of Engineering Physics(CAEP)with the mission of informing the worldwide scientific community about progress related to HEDS,whether this be in the basic physics.

关键词： conditions. extreme acceleration

2020-Transformative science in the pressure dimension

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Matter and Radiation at Extremes 2021年第1期6卷 1-2页

Materials transform abruptly under compression,with their properties varying as strong functions of *** in highpressure and probe technology have enabled experimental characterizations up to several hundred gigapascal(GPa).Studies in the physical sciences are now expanding to include a vast previously uncharted pressure region in which transformative ideas and discoveries are becoming *** and Radiation under Extremes(MRE)is taking advantage of this opportunity to provide a forum for publishing the finest peer-reviewed research in highpressure science and technology on the basis of its interdisciplinary interest,importance,timeliness,and surprising *** MRE HP Special Volume gathers together a set of contemporary perspectives,highlights,reviews,and research articles in multiple disciplines of high-pressure physics,chemistry,materials,and geoscience that illustrate both current and forthcoming trends in this exciting research area.

关键词： expanding becoming publishing