R
Russell J. Hemley
Researcher at University of Illinois at Chicago
Publications - 630
Citations - 37696
Russell J. Hemley is an academic researcher from University of Illinois at Chicago. The author has contributed to research in topics: Raman spectroscopy & Diamond anvil cell. The author has an hindex of 98, co-authored 613 publications receiving 34384 citations. Previous affiliations of Russell J. Hemley include Johns Hopkins University & George Washington University.
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Low compressibility carbon nitrides
David M. Teter,Russell J. Hemley +1 more
TL;DR: A cubic form of C3N4 with a zero-pressure bulk modulus exceeding that of diamond is described in this paper, and a process for preparing such product which comprises combining carbon and nitrogen at a pressure of 120,000 to 800,000 atmosphere and a temperature of 1000-3000 °C is described.
Journal ArticleDOI
Evidence for Superconductivity above 260 K in Lanthanum Superhydride at Megabar Pressures
Maddury Somayazulu,Muhtar Ahart,Ajay Kumar Mishra,Zachary M. Geballe,Maria Baldini,Yue Meng,Viktor V. Struzhkin,Russell J. Hemley +7 more
TL;DR: It is suggested that the transitions represent signatures of superconductivity to near room temperature in phases of lanthanum superhydride, in good agreement with density functional structure search and BCS theory calculations.
Journal ArticleDOI
Hydrogen clusters in clathrate hydrate.
Wendy L. Mao,Wendy L. Mao,Ho-kwang Mao,Alexander F. Goncharov,Viktor V. Struzhkin,Quanzhong Guo,J. Z. Hu,Jinfu Shu,Russell J. Hemley,Maddury Somayazulu,Yusheng Zhao +10 more
TL;DR: High-pressure Raman, infrared, x-ray, and neutron studies show that H2 and H2O mixtures crystallize into the sII clathrate structure with an approximate H2/H2Omolar ratio of 1:2.
Journal ArticleDOI
Origin of morphotropic phase boundaries in ferroelectrics
Muhtar Ahart,Maddury Somayazulu,Ronald E. Cohen,Panchapakesan Ganesh,Przemyslaw Dera,Ho-kwang Mao,Russell J. Hemley,Yang Ren,Peter Liermann,Zhigang Wu +9 more
TL;DR: This work shows that even a pure compound, in this case lead titanate, can display a morphotropic phase boundary under pressure, and finds that complex microstructures or compositions are not necessary to obtain strong piezoelectricity.
Journal ArticleDOI
Potential high-Tc superconducting lanthanum and yttrium hydrides at high pressure.
TL;DR: The study suggests that dense hydrides consisting of lanthanum and yttrium and related hydrogen polyhedral networks may represent new classes of potential very high-temperature superconductors.