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  • 1
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    Thermoelasticity of perovskite: An emerging consensus (1994)
    In:  Eos, Trans., Am. Geophys. Un., Berlin, Schweizerbart'sche Verlagsbuchhandlung, vol. 75, no. 41, pp. 476, pp. L07302, (ISSN 0016-8548, ISBN 3-510-50045-8)
    Details
    Publication Date: 1994
    Keywords: Physical properties of rocks ; Geothermics ; Elasticity ; Mineralogy
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    BIBLIOGRAPHY SEISMOLOGY
  • 2
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    In situ observations of a high-pressure phase of H2O Ice (1998)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1998-08-07
    Description: A previously unknown solid phase of H2O has been identified by its peculiar growth patterns, distinct pressure-temperature melting relations, and vibrational Raman spectra. Morphologies of ice crystals and their pressure-temperature melting relations were directly observed in a hydrothermal diamond-anvil cell for H2O bulk densities between 1203 and 1257 kilograms per cubic meter at temperatures between -10 degrees and 50 degreesC. Under these conditions, four different ice forms were observed to melt: two stable phases, ice V and ice VI, and two metastable phases, ice IV and the new ice phase. The Raman spectra and crystal morphology are consistent with a disordered anisotropic structure with some similarities to ice VI.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Chou -- Blank -- Goncharov -- Mao -- Hemley -- New York, N.Y. -- Science. 1998 Aug 7;281(5378):809-12.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉I. Chou, 955 National Center, U.S. Geological Survey, Reston, VA 20192, USA. J. G. Blank, A. F. Goncharov, H. Mao, R. J. Hemley, Geophysical Laboratory and Center for High Pressure Research, Carnegie Institution of Washington, 5251 Broad.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9694649" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 3
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    Superconductivity in boron (2001)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 2001-07-14
    Description: Metals formed from light elements are predicted to exhibit intriguing states of electronic order. Of these materials, those containing boron are of considerable current interest because of their relatively high superconducting temperatures. We have investigated elemental boron to very high pressure using diamond anvil cell electrical conductivity techniques. We find that boron transforms from a nonmetal to a superconductor at about 160 gigapascals (GPa). The critical temperature of the transition increases from 6 kelvin (K) at 175 GPa to 11.2 K at 250 GPa, giving a positive pressure derivative of 0.05 K/GPa. Although the observed metallization pressure is compatible with the predictions of first-principles calculations, superconductivity in boron remains to be explored theoretically. The present results constitute a record pressure for both electrical conductivity studies and investigations of superconductivity in dense matter.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Eremets, M I -- Struzhkin, V V -- Mao , H -- Hemley, R J -- New York, N.Y. -- Science. 2001 Jul 13;293(5528):272-4.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Geophysical Laboratory and Center for High Pressure Research, Carnegie Institution of Washington, 5251 Broad Branch Road, NW, Washington, DC 20015, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/11452118" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 4
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    Raman spectroscopy of iron to 152 gigapascals: implications for Earth's inner core (2000)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2000-06-02
    Description: Raman spectra of hexagonal close-packed iron (varepsilon-Fe) have been measured from 15 to 152 gigapascals by using diamond-anvil cells with ultrapure synthetic diamond anvils. The results give a Gruneisen parameter gamma(0) = 1.68 (+/-0.20) and q = 0.7 (+/-0.5). Phenomenological modeling shows that the Raman-active mode can be approximately correlated with an acoustic phonon and thus provides direct information about the high-pressure elastic properties of iron, which have been controversial. In particular, the C(44) elastic modulus is found to be lower than previous determinations. This leads to changes of about 35% at core pressures for shear wave anisotropies.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Merkel -- Goncharov -- Mao -- Gillet -- Hemley -- New York, N.Y. -- Science. 2000 Jun 2;288(5471):1626-9.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Geophysical Laboratory and Center for High Pressure Research, Carnegie Institution of Washington, 5251 Broad Branch Road, NW, Washington, DC 20015, USA. Laboratoire des Sciences de la Terre, UMR CNRS 5570, Ecole Normale Superieure de Lyon〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/10834838" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 5
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    Phonon density of states of iron up to 153 gigapascals (2001)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 2001-05-08
    Description: We report phonon densities of states (DOS) of iron measured by nuclear resonant inelastic x-ray scattering to 153 gigapascals and calculated from ab initio theory. Qualitatively, they are in agreement, but the theory predicts density at higher energies. From the DOS, we derive elastic and thermodynamic parameters of iron, including shear modulus, compressional and shear velocities, heat capacity, entropy, kinetic energy, zero-point energy, and Debye temperature. In comparison to the compressional and shear velocities from the preliminary reference Earth model (PREM) seismic model, our results suggest that Earth's inner core has a mean atomic number equal to or higher than pure iron, which is consistent with an iron-nickel alloy.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Mao, H K -- Xu, J -- Struzhkin, V V -- Shu, J -- Hemley, R J -- Sturhahn, W -- Hu, M Y -- Alp, E E -- Vocadlo, L -- Alfe, D -- Price, G D -- Gillan, M J -- Schwoerer-Bohning, M -- Hausermann, D -- Eng, P -- Shen, G -- Giefers, H -- Lubbers, R -- Wortmann, G -- New York, N.Y. -- Science. 2001 May 4;292(5518):914-6.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Geophysical Laboratory and Center for High Pressure Research, Carnegie Institution of Washington, Washington, DC 20015, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/11340201" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 6
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    Microbial activity at gigapascal pressures (2002)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 2002-02-23
    Description: We observed physiological and metabolic activity of Shewanella oneidensis strain MR1 and Escherichia coli strain MG1655 at pressures of 68 to 1680 megapascals (MPa) in diamond anvil cells. We measured biological formate oxidation at high pressures (68 to 1060 MPa). At pressures of 1200 to 1600 MPa, living bacteria resided in fluid inclusions in ice-VI crystals and continued to be viable upon subsequent release to ambient pressures (0.1 MPa). Evidence of microbial viability and activity at these extreme pressures expands by an order of magnitude the range of conditions representing the habitable zone in the solar system.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Sharma, Anurag -- Scott, James H -- Cody, George D -- Fogel, Marilyn L -- Hazen, Robert M -- Hemley, Russell J -- Huntress, Wesley T -- New York, N.Y. -- Science. 2002 Feb 22;295(5559):1514-6.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Geophysical Laboratory, Carnegie Institution of Washington, 5251 Broad Branch Road, N.W., Washington, DC 20015, USA. sharma@gl.ciw.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/11859192" target="_blank"〉PubMed〈/a〉
    Keywords: Adaptation, Physiological ; Diamond ; Escherichia coli/cytology/metabolism/*physiology ; Formates/*metabolism ; Ice ; Methylene Blue/metabolism ; Movement ; Oxidation-Reduction ; *Pressure ; Shewanella putrefaciens/cytology/metabolism/*physiology ; Spectrum Analysis, Raman ; Temperature
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
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  • 7
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    Superconductivity in dense lithium (2002)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2002-10-19
    Description: Superconductivity in compressed lithium is observed by magnetic susceptibility and electrical resistivity measurements. A superconducting critical temperature (Tc) is found ranging from 9 to 16 kelvin at 23 to 80 gigapascals. The pressure dependence of Tc suggests multiple phase transitions, consistent with theoretical predictions and reported x-ray diffraction results. The observed values for Tc are much lower than those theoretically predicted, indicating that more sophisticated theoretical treatments similar to those proposed for metallic hydrogen may be required to understand superconductivity in dense phases of lithium.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Struzhkin, Viktor V -- Eremets, Mikhail I -- Gan, Wei -- Mao, Ho-kwang -- Hemley, Russell J -- New York, N.Y. -- Science. 2002 Nov 8;298(5596):1213-5. Epub 2002 Oct 17.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Geophysical Laboratory, Carnegie Institution of Washington, 5251 Broad Branch Road, N.W., Washington, DC 20015, USA. struzhkin@gl.ciw.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/12386338" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 8
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    Enhancement of superconductivity by pressure-driven competition in electronic order (2010)
    Nature Publishing Group (NPG)
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    Publication Date: 2010-08-21
    Description: Finding ways to achieve higher values of the transition temperature, T(c), in superconductors remains a great challenge. The superconducting phase is often one of several competing types of electronic order, including antiferromagnetism and charge density waves. An emerging trend documented in heavy-fermion and organic conductors is that the maximum T(c) for superconductivity occurs under external conditions that cause the critical temperature for a competing order to go to zero. Recently, such competition has been found in multilayer copper oxide high-temperature superconductors (HTSCs) that possess two crystallographically inequivalent CuO(2) planes in the unit cell. However, whether the competing electronic state can be suppressed to enhance T(c) in HTSCs remains an open question. Here we show that pressure-driven phase competition leads to an unusual two-step enhancement of T(c) in optimally doped trilayer Bi(2)Sr(2)Ca(2)Cu(3)O(10+delta) (Bi2223). We find that T(c) first increases with pressure and then decreases after passing through a maximum. Unexpectedly, T(c) increases again when the pressure is further raised above a critical value of around 24 GPa, surpassing the first maximum. The presence of this critical pressure is a manifestation of the crossover from the competing order to superconductivity in the inner of the three CuO(2) planes. We suggest that the increase at higher pressures occurs as a result of competition between pairing and phase ordering in different CuO(2) planes.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Chen, Xiao-Jia -- Struzhkin, Viktor V -- Yu, Yong -- Goncharov, Alexander F -- Lin, Cheng-Tian -- Mao, Ho-Kwang -- Hemley, Russell J -- England -- Nature. 2010 Aug 19;466(7309):950-3. doi: 10.1038/nature09293.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Geophysical Laboratory, Carnegie Institution of Washington, Washington DC 20015, USA. xjchen@ciw.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/20725035" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Published by Nature Publishing Group (NPG)
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  • 9
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    Origin of morphotropic phase boundaries in ferroelectrics (2008)
    Nature Publishing Group (NPG)
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    Publication Date: 2008-02-01
    Description: A piezoelectric material is one that generates a voltage in response to a mechanical strain (and vice versa). The most useful piezoelectric materials display a transition region in their composition phase diagrams, known as a morphotropic phase boundary, where the crystal structure changes abruptly and the electromechanical properties are maximal. As a result, modern piezoelectric materials for technological applications are usually complex, engineered, solid solutions, which complicates their manufacture as well as introducing complexity in the study of the microscopic origins of their properties. Here we show that even a pure compound, in this case lead titanate, can display a morphotropic phase boundary under pressure. The results are consistent with first-principles theoretical predictions, but show a richer phase diagram than anticipated; moreover, the predicted electromechanical coupling at the transition is larger than any known. Our results show that the high electromechanical coupling in solid solutions with lead titanate is due to tuning of the high-pressure morphotropic phase boundary in pure lead titanate to ambient pressure. We also find that complex microstructures or compositions are not necessary to obtain strong piezoelectricity. This opens the door to the possible discovery of high-performance, pure-compound electromechanical materials, which could greatly decrease costs and expand the utility of piezoelectric materials.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Ahart, Muhtar -- Somayazulu, Maddury -- Cohen, R E -- Ganesh, P -- Dera, Przemyslaw -- Mao, Ho-kwang -- Hemley, Russell J -- Ren, Yang -- Liermann, Peter -- Wu, Zhigang -- England -- Nature. 2008 Jan 31;451(7178):545-8. doi: 10.1038/nature06459.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Geophysical Laboratory, Carnegie Institution of Washington, 5251 Broad Branch Road, Washington, DC 20015, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/18235495" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Published by Nature Publishing Group (NPG)
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  • 10
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    In reply: evidence for band overlap metallization of hydrogen (1990)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1990-02-16
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Mao, H K -- Hemley, R J -- New York, N.Y. -- Science. 1990 Feb 16;247(4944):863-4.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17746078" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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