Search Results - "Kleppe, A. K."

Structure of sodium above 100 GPa by single-crystal x-ray diffraction by McMahon, M.I, Gregoryanz, E, Lundegaard, L.F, Loa, I, Guillaume, C, Nelmes, R.J, Kleppe, A.K, Amboage, M, Wilhelm, H, Jephcoat, A.P

“…At pressures above a megabar (100 GPa), sodium crystallizes in a number of complex crystal structures with unusually low melting temperatures, reaching as low…”
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The stability of hydrous silicates in Earth's lower mantle: Experimental constraints from the systems MgO–SiO2–H2O and MgO–Al2O3–SiO2–H2O by Walter, M.J., Thomson, A.R., Wang, W., Lord, O.T., Ross, J., McMahon, S.C., Baron, M.A., Melekhova, E., Kleppe, A.K., Kohn, S.C.

“…We performed laser-heated diamond anvil cell experiments on bulk compositions in the systems MgO–SiO2–H2O (MSH) and MgO–Al2O3–SiO2–H2O (MASH) that constrain…”
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Pressure-driven evolution of the covalent network in CaB6 by Kolmogorov, A N, Shah, S, Margine, E R, Kleppe, A K, Jephcoat, A P

“…We synthesized and solved an unexpectedly complex crystal structure of CaB(6) under high pressures (up to 44 GPa) and temperatures. The only known crystal…”
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Electric-field-induced phase switching in the lead free piezoelectric potassium sodium bismuth titanate by Royles, A. J., Bell, A. J., Jephcoat, A. P., Kleppe, A. K., Milne, S. J., Comyn, T. P.

“…High-energy synchrotron radiation has been used to demonstrate an electric-field-induced phase transformation in the ceramic xK 1 / 2 Bi 1 / 2 TiO 3 - ( 1 − x…”
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Polymorphism of the hydroxide perovskite Ga(OH)3 and possible proton-driven transformational behaviour by Welch, M. D., Kleppe, A. K.

“…The crystal structure of hydroxide perovskite Ga(OH) 3 , the mineral söhngeite, has been determined for a natural sample by single-crystal XRD in space group P…”
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Competing hydrostatic compression mechanisms in nickel cyanide by Adamson, J., Lucas, T.C., Cairns, A.B., Funnell, N.P., Tucker, M.G., Kleppe, A.K., Hriljac, J.A., Goodwin, A.L.

“…We use variable-pressure neutron and X-ray diffraction measurements to determine the uniaxial and bulk compressibilities of nickel(II) cyanide, Ni(CN)2…”
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Raman spectroscopic study of hydrous wadsleyite (β-Mg 2 SiO 4 ) to 50 GPa by Kleppe, A. K., Jephcoat, A. P., Olijnyk, H., Slesinger, A. E., Kohn, S. C., Wood, B. J.

“…Raman spectra of hydrous β-Mg2SiO4 (1.65 wt% H2O) have been measured in a diamond-anvil cell with helium as a pressure-transmitting medium at room temperature…”
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Raman spectroscopic study of hydrous γ-Mg2SiO4 to 56.5 GPa by Kleppe, A K, Jephcoat, A P, Smyth, J R

“…Raman spectra of a single-crystal fragment of hydrous γ-Mg2SiO4, synthesized in a multianvil press, have been measured in a diamond-anvil cell with helium as…”
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Questioning the evidence for Earth's oldest fossils by Brasier, Martin D, Green, Owen R, Jephcoat, Andrew P, Kleppe, Annette K, Van Kranendonk, Martin J, Lindsay, John F, Steele, Andrew, Grassineau, Nathalie V

“…Structures resembling remarkably preserved bacterial and cyanobacterial microfossils from ∼3,465-million-year-old Apex cherts of the Warrawoona Group in…”
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Pressure-Driven Evolution of the Covalent Network in CaB 6 by Kolmogorov, A. N., Shah, S., Margine, E. R., Kleppe, A. K., Jephcoat, A. P.

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Source assemblage types for cratonic diamonds from X-ray synchrotron diffraction by Nestola, F., Alvaro, M., Casati, M.N., Wilhelm, H., Kleppe, A.K., Jephcoat, A.P., Domeneghetti, M.C., Harris, J.W.

“…Three single crystals of clinopyroxene trapped within three different gem-quality diamonds from the Udachnaya kimberlite (Siberia, Russia) were analysed in…”
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Perovskite Phase Relations in the System CaO-MgO-TiO2-SiO2 and Implications for Deep Mantle Lithologies by Armstrong, L. S., Walter, M. J., Tuff, J. R., Lord, O. T., Lennie, A. R., Kleppe, A. K., Clark, S. M.

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Investigations on Thermoluminescence and Phosphorescence Properties of Rare Earth Doped Calcium Fluoride by Kleppe, A.K., Meissner, P.

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Crystal structure and cation disorder in bulk Cu2ZnSnS4 using neutron diffraction and X-ray anomalous scattering by Bosson, C. J., Birch, M. T., Halliday, D. P., Knight, K. S., Tang, C. C., Kleppe, A. K., Hatton, P. D.

“…Cu 2 ZnSnS 4 (CZTS) is a promising material for the absorber layer in sustainable thin film photovoltaic cells, but its best efficiencies are currently limited…”
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Perovskite Phase Relations in the System CaO-MgO-TiO sub(2)-SiO sub(2) and Implications for Deep Mantle Lithologies by Armstrong, L S, Walter, MJ, Tuff, J R, Lord, O T, Lennie, A R, Kleppe, A K, Clark, S M

“…Experiments at 20-97 GPa and 2000 K in the system CaO-MgO-TiO sub(2)-SiO sub(2) constrain phase relations involving Mg-rich and Ca-rich perovskite solid…”
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High-pressure compounds in xenon–hydrogen mixtures by Amboage, M., Kleppe, A. K., Jephcoat, A. P.

“…Abstract only…”
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Novel high-pressure van der Waals compound in solid hydrogen–krypton mixtures by Kleppe, A. K., Amboage, M., Jephcoat, A. P.

“…Abstract only…”
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On protons, iron and the high-pressure behavior of ringwoodite by Kleppe, A K, Jephcoat, A P, Smyth, J R, Frost, D J

“…Raman spectra of a single crystal of hydrous Fo89-ringwoodite were measured in a diamond-anvil cell at room temperature to 60 GPa. Strong peaks corresponding…”
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Raman spectroscopic study of hydrous γ -Mg 2 SiO 4 to 56.5 GPa by Kleppe, A. K., Jephcoat, A. P., Smyth, J. R.

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On protons, iron and the high-pressure behavior of ringwoodite by Kleppe, Annette K., Jephcoat, Andrew P., Smyth, Joseph R., Frost, Daniel J.

“…Raman spectra of a single crystal of hydrous Fo89‐ringwoodite have been measured in a diamond‐anvil cell at room temperature to 60 GPa. Strong peaks…”
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