A wide range of problems in materials physics from ambient to extreme conditions are investigated. These include condensed matter studies as a function of pressure and temperature as well the development of new potentially useful materials.

• High-pressure materials
• Ferroelectrics
• Superconductivity
• CVD Diamond

Recent Publications

3652   Ahart, M., A. Asthagiri, Z.-G. Ye, P. Dera, H. K. Mao,R. E. Cohen, and R. J. Hemley, Brillouin scattering and molecular dynamicsstudy of the elastic properties of Pb(Mg1/3Nb2/3)O3,Phys. Rev. B 75, 144410, 2007.

3776   Ahart, M., M. Somayazulu , R. E. Cohen, P. Ganesh, P.Dera, H. K. Mao, R. J. Hemley, Y. Ren, P. Liermann, and Z. Wu, Origin ofmorphotropic phase boundaries in ferroelectrics, Nature 451, 545-548, 2008.

3726   Caracas, R., and R. E. Cohen, Prediction of polarordered oxynitride perovskites, Appl. Phys. Lett. 91, 092902, 2007.

3758   Caracas, R., and R. E. Cohen, Post-perovskite phase inselected sesquioxides from density-functional calculations, Phys. Rev. B 76, 184101, 2007.

____   Caracas, R., and R. E. Cohen, Effect of chemistry on the physical properties of perovskite and post-perovskite, in Post-Perovskite:The Last Mantle Phase Transition, K. Hiroseet al., eds., American Geophysical Union, Washington, D.C., in press.

3713   Caracas, R., and R. J. Hemley, New structures of densenitrogen:  Pathways to thepolymeric phase, Chem. Phys. Lett. 442,65-70, 2007.

3770   Chen, X.-J., B. Liang, C. Ulrich, C.-T. Lin, V. V.Struzhkin, Z. Wu, R. J. Hemley, H. K. Mao, and H.-Q. Lin, Oxygen isotope effectin Bi2Sr2Can-1CunO2n+4+d(n=1,2,3) single crystals, PhysRev. B 76, 140502, 2007.

3742   Chen, X.-J., V. V. Struzhkin, A. F. Goncharov, R. J.Hemley, and H. K. Mao, Oxygen isotope effect in a high-temperaturesuperconductor under high pressure, J. Phys.: Cond. Matter 19, 425236, 2007.

3689   Chen, X.-J., V. V. Struzhkin, Z. Wu, R. J. Hemley, H. K.Mao, and H.-Q. Lin, Phonon-mediated superconducting transitions in layered cuprate superconductors, Phys. Rev. B 75,134504, 2007.

3662   Chen, X.-J., V. V. Struzhkin, Z. Wu, H.-Q. Lin, R. J.Hemley, and H. K. Mao, Unified picture of the oxygen isotope effect in cupratesuperconductors, Proc. Natl. Acad. Sci. USA 104, 3732-3735, 2007.

____   Crowhurst, J. C., A. F. Goncharov, B. Sadigh, J. M.Zaug, D. Aberg, Y. Meng, and V. B. Prakapenka, Synthesis and characterization of nitrides of iridium and palladium, J. Mater. Res., in press.

3772   Dattelbaum, D. M., L. L. Stevens, E. B. Orler, M. Ahart,and R. J. Hemley, Brillouin-scattering determination of the acoustic propertiesof polymers at high pressure, in Shock Compression of Condensed Matter -2007, M. Elert et al., eds., pp. 39-42, AIPConference Proceedings 955, American Institute of Physics, Melville, N.Y.,2007.

3779   de Lill, D. T., and C. L. Cahill, Synthesis and characterization of a praseodymium-adipate framework templated with1,2-bis(4-pyridyl)ethane: host-guest interactions and structural survey, Cryst. Growth Des. 7, 2390-2393, 2007.

3691   de Lill, D. T., A. de Bettencourt-Dias, and C. L.Cahill, Exploring lanthanide luminescence in metal-organic frameworks:  synthesis, structure, and guest-sensitized luminescence of a mixed europium/terbium-adipate framework and a terbium-adipate framework, Inorg. Chem. 46, 3960-3965, 2007.

3761   Gavriliuk, A. G., V. V. Struzhkin, I. S. Lyubutin, andI. A. Troyan, Equation of state and structural transition at high hydrostatic pressures in the BiFeO3 crystal, JETP Lett. 86, 197-201, 2007.

3754   Han, W.-Q., W. Wen, D. Yi, Z. Liu, M. M. Maye, L. Lewis,J. Hanson, and O. Gang, Fe-doped trititanate nanotubes:  formation, optical and magneticproperties, and catalytic applications, J. Phys. Chem. C 111, 14339 -14342, 2007.

3739   Knope, K. E., and C. L. Cahill, Hydrothermal synthesisof a novel uranium oxalate/glycolate via in-situ ligand formation, Inorg. Chem.46, 6607-6612, 2007.

3740   Knope, K. E., and C. L. Cahill,1,4-Diazoniabicyclo[2.2.2]octane dinitrate, Acta Crystallogr. E63, o2955, 2007.

3665   Larson, B. C., A. El-Azab, W. Yang, J. Z. Tischler, W.Liu, and G. E. Ice, Experimental characterization of the mesoscale dislocation density tensor, Phil. Mag. 87,1327-1347, 2007.

3778   Ponosov, Yu. S., V. V. Struzhkin, S. V. Strel'tsov, andA. F. Goncharov, Light scattering by electrons in osmium:  effect of pressure, JETP Lett. 86, 398-403, 2007.

3771   Pravica, M., Z. Quine, E. Romano, S. Bajar, B. Yulga, W.Yang, and D. Hooks, Anisotropic decomposition of energetic materials, in Shock Compression of Condensed Matter - 2007, M.Elert et al., eds., pp. 1117-1120, AIP Conference Proceedings 955, American Institute of Physics, Melville, N.Y., 2007.

3688   Sha, X., and R. E. Cohen, Lattice dynamics andthermodynamics of bcc vanadium at high pressures, in Materials Research at High Pressure, M. R. Manaa et al., eds.,pp. 185-195, Symposium Proceedings Vol. 987, Materials Research Society,Warrendale, Pennsylvania, 2007.

3673   Sheng, H. W., H. Z. Liu, Y. Q. Cheng, J. Wen, P. L. Lee,W. K. Luo, S. D. Shastri, and E. Ma, Polyamorphism in a metallic glass,Nature Mater. 6, 192-197, 2007.