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OCTOBER 19, 2017— New work led by HPSTAR researcher, Dr. Gang Liu experimentally convinced a first example of pressure-improved 2D hybrid perovskites and proposed that pressure treatments might offer a useful route to yield near-ideal single junction performance in the 2D hybrid perovskites. The discoveries are published by ACS Energy Letters.
SEPTEMBER 29, 2017 — Pressure, as a fundamental thermodynamic parameter that can tailor physical and chemical properties of functional materials, has recently been used in tuning structures and properties of organic-inorganic hybrid perovskites. In recent issue of Chemical Science, a team of scientists led by Dr. Xujie Lü of HPSTAR gave a perspective of how pressure make changes in the hybrid...
SEPTEMBER 11, 2017 — From a geoscientist_sqlquote_s view, the earth is made up of a giant iron core, covered by a thick layer of silicate mantle and a thin coating of crustal rocks. Water concentrates in oceans on Earth’s surface. A portion of water reacts with rocks and forms the so-called hydrous minerals that can transport deep into the mantle. Once they reach the bottom of the mantle,...
SEPTEMBER 8, 2017 — New work led by HPSTAR graduate student, Cong Xu found abnormal semiconductor to insulator transition in cathode material, Li0.9CoO2 under pressure. The findings uncovered by the comprehensive high pressure investiations provide deep insights into the complex relationship of the crystal structure and electronic performance in this important cathode material, which may be used...
AUGUST 27, 2017— Lithium acetylide, as a widely used electrode material for Li-ion battery has the highest theoretical capacity while with low conductivity for applications. New work from a HPSTAR team increased the conductivity of Lithium acetylide by 9 orders of magnitude in the use of high pressure method. And this pressure-enhanced conductivity could be kept to ambient conditions. Their...
SEPTEMBER 1, 2017 — A team co-led by HPSTAR PhD student Fengliang Liu, investigated the evolution of superconductivity and structure with pressure for the new superconductor FeS (Tc ≈ 4.5 K), a sulfide counterpart of FeSe. They observed two superconducting domes in FeS under compression with 30% enhancement in maximum Tc in the second dome. Their discoveries are published by NPJ Quantum Materials ...
AUGUST 23, 2017 — Thanks to the symmetric O-H-O bonding, a certain class of hydrous minerals is recently discovered to survive in the high-pressure high-temperature condition that mimics the deep lower mantle. The composition FeO2H, named goethite when they are found on Earth surface, is one of such hydrous minerals. It forms symmetric O-H-O framework at high-pressure hence features higher...
AUGUST 22, 2017 — A team led by HPSTAR scientist, Dr. Zhidan Zeng synthesizes a new form of carbon —“amorphous diamond”—under high pressure and temperature (HPHT). This bulk amorphous diamond obtained under HPHT can be maintained to ambient conditions for potential applications, realizing possible the hardest amorphous (glass) material ever discovered. This work is recently published as an article...
AUGUST 17, 2017 — New work by HPSTAR_sqlquote_s Ross Howie and Xiao-Jia Chen, in collaboration with the ISSP Chinese Academy of Sciences, presents the first high-pressure experimental study of hydrogen that was completely conducted within China. The authors present in situ high-pressure low-temperature high-quality Raman data for hydrogen and deuterium where they demonstrate the presence of a...
AUGUST 14, 2017 — Nitrogen-bearing, carbon-rich materials are known to have multiple functionalities and diverse applications. Graphitic carbon nitride (g-C3N4) is the most common C-N phase studied, but several other phases with varying compositions and properties have been predicted. A group of scientists led by Huiyang Gou of HPSTAR and Timothy Strobel of Geophysical lab performed high-pressure ...
APRIL 14, 2017 —The rapidly growing energy demand requires the development of advanced electrical energy storage technology. New work from a team including Dr. Huiyang Gou at HPSTAR and Dr. Gongkai Wang from Hebei University of Technology and Prof. Jie Lian from RPI published in Nano Energy show that the composite materials of nanosized Li4Ti5O12 (LTO) and graphene nanosheets can have excellent...
JULY 11, 2017 — A material with good structural stability, chemical durability, and radiation tolerance under extreme conditions is necessary and long challenge for developing new pressure sensors. New work co-led by HPSTAR scientist, Dr. Wenge Yang found novel visble photoluminescence in pyrochlore La2Sn2O7 induced by pressure. This unexpected reversible photoluminescence suggests that La2Sn2O7...
JULY 11, 2017— Pressure induced superconductivity has been realized in several systems, while the superconductivity will disappear with pressure quench. So how to preserve the pressure-induced superconductivity remains a problem to be solved. New research from HPSTAR revealed that enhanced superconductivity happened in In2Se3 during pressure quench. This opens up a possible route to preserve the ...
JUNE 9, 2017—Carbon is an element of seemingly infinite possibilities. This is because the configuration of its electrons allows for numerous self-bonding combinations that give rise to a range of materials with varying properties. For example, transparent, superhard diamonds, and opaque graphite, which is used for both pencils and industrial lubricant, are comprised solely of carbon. A...
JUNE 2, 2017 — New study co-led by a HPSTAR staff scientist, Dr. Qiaoshi “Charles” Zeng revealed irreversible polymorphic phase transitions between the fcc and hcp structures in a prototype high-entropy alloy CoCrFeMnNi using in situ high pressure and high temperature x-ray diffraction techniques. Their discovery was just published in Nature Communications (DOI:10.1038/ncomms15687) on June 1st....
JANUARY 20, 2016 — Phase transitions in surface-modified TiO2 nanocrystals—An unprecedented surface doping-driven anomaly in the compression behaviors of nanocrystals has been discovered by a HPSTAR research group Led by Dr. Gang Liu. This work provides an unconventional and new degree of freedom in search for nanocrystals with novel tunable properties that can trigger applications in multiple...
MAY 3, 2017 —
Scientists from HPSTAR, co-led by Drs. Kuo Li and Haiyan Zheng, have quantitatively explained the reaction route of polymerization of C2H2 under extreme condition by neutron diffraction and theoretical calculation. They discovered that under high pressure, acetylene molecules react along a specific crystallographic direction, which leads to the cis-polyacetylene. Following this route...
APRIL 5, 2017 —
北京高压科学研究中心陈久华研究员与台湾中央研究院謝文斌实验室合作，成功测试了高压下水对橄榄石热导率的影响，发现尽管常压下橄榄石热导率几乎不受水的影响，但在过度带的压力下（十三万大气压以上）橄榄石中的水会使其热导率下降一半。因此俯冲带中的温度会比原来科学家想象更低，橄榄石又可以在过度带生存了。该研究结果“Hydration-reduced lattice thermal conductivity of olivine in Earth_sqlquote_s upper...
APRIL 5, 2017 —
Scientists from HPSTAR and IOP-CAS, in collaboration with Dr. Rohit Prasankumar’s group at LANL, studied the temperature evolution of electronic and phonon properties of the Weyl semimetal TaAs using infrared spectroscopy. They found explicit evidence for strong coupling between an infrared-active A1 phonon and Weyl fermions in TaAs. The study is published in Nature...
MARCH 30, 2017 —
Scientists from HPSTAR and The University of Hong Kong combined in situ synchrotron x-ray diffraction and density functional theory and evolutionary algorithms to examine the high-pressure structural behavior of Sn-Se system. The team observed a new compound with an unexpected stoichiometry in the Sn-Se binary system. The research is published in the March 28th edition of Physical...
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