Stewart Mcwilliams

PROF

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Research Interests

I study high pressure and high temperature states of matter in the laboratory to address questions of scientific and technological interest.  I am interested in materials relevant to natural systems such as planetary interiors and to technologies such as energetic materials and inertial confinement fusion.  I develop and use ultrafast methods to create, sustain, and study extreme states.  These techniques use the diamond-anvil cell (static compression) and laser-driven shock compression (dynamic compression) to generate particular extreme states.  I visit facilities worldwide for access to high power laser systems, synchrotron radiation, and other special instrumentation.  I characterize fundamental material properties including strength, elastic moduli, optical properties, and melting points and examine how extreme conditions can be used to synthesize new materials.

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Collaborations and top research areas from the last five years

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  • Phase transition kinetics of superionic H2O ice phases revealed by Megahertz X-ray free-electron laser-heating experiments

    Husband, R. J., Liermann, H. P., McHardy, J. D., McWilliams, R. S., Goncharov, A. F., Prakapenka, V. B., Edmund, E., Chariton, S., Konôpková, Z., Strohm, C., Sanchez-Valle, C., Frost, M., Andriambariarijaona, L., Appel, K., Baehtz, C., Ball, O. B., Briggs, R., Buchen, J., Cerantola, V., Choi, J., & 20 othersColeman, A. L., Cynn, H., Dwivedi, A., Graafsma, H., Hwang, H., Koemets, E., Laurus, T., Lee, Y., Li, X., Marquardt, H., Mondal, A., Nakatsutsumi, M., Ninet, S., Pace, E., Pepin, C., Prescher, C., Stern, S., Sztuk-Dambietz, J., Zastrau, U. & McMahon, M. I., 23 Sept 2024, In: Nature Communications. 15, 1, p. 1-13 13 p., 8256.

    Research output: Contribution to journalArticlepeer-review

    Open Access
  • Measurement bias in self-heating x-ray free electron laser experiments from diffraction studies of phase transformation in titanium

    Ball, OB., Husband, RJ., McHardy, JD., McMahon, MI., Strohm, C., Konôpková, Z., Appel, K., Cerantola, V., Coleman, AL., Cynn, H., Dwivedi, A., Goncharov, AF., Graafsma, H., Huston, LQ., Hwang, H., Kaa, J., Kim, JY., Koemets, E., Laurus, T., Li, X., & 18 othersMarquardt, H., Méndez, ASJ., Merkel, S., Mondal, A., Morard, G., Prakapenka, VB., Prescher, C., Preston, TR., Speziale, S., Stern, S., Sturtevant, BT., Sztuk-Dambietz, J., Velisavljevic, N., Yoo, CS., Zastrau, U., Jenei, Z., Liermann, HP. & McWilliams, RS., 21 Sept 2024, In: Journal of applied physics. 136, 11, p. 1-12 12 p., 115902.

    Research output: Contribution to journalArticlepeer-review

    Open Access
  • High-Pressure Synthesis of Ultra-Incompressible, Hard and Superconducting Tungsten Nitrides

    Liang, A., Osmond, I., Krach, G., Shi, L. T., Brüning, L., Ranieri, U., Spender, J., Tasnadi, F., Massani, B., Stevens, C. R., McWilliams, R. S., Bright, E. L., Giordano, N., Gallego-Parra, S., Yin, Y., Aslandukov, A., Akbar, F. I., Gregoryanz, E., Huxley, A., Peña-Alvarez, M., & 5 othersSi, J. G., Schnick, W., Bykov, M., Trybel, F. & Laniel, D., 8 Aug 2024, In: Advanced Functional Materials. 34, 32, p. 1-12 12 p., 2313819.

    Research output: Contribution to journalArticlepeer-review

    Open Access
  • Shock compression experiments using the DiPOLE 100-X laser on the high energy density instrument at the European x-ray free electron laser: Quantitative structural analysis of liquid Sn

    Gorman, MG., McGonegle, D., Smith, RF., Singh, S., Jenkins, T., McWilliams, RS., Albertazzi, B., Ali, SJ., Antonelli, L., Armstrong, MR., Baehtz, C., Ball, OB., Banerjee, S., Belonoshko, AB., Benuzzi-Mounaix, A., Bolme, CA., Bouffetier, V., Briggs, R., Buakor, K., Butcher, T., & 105 othersCafiso, SD., Cerantola, V., Chantel, J., Di Cicco, A., Clarke, S., Coleman, AL., Collier, J., Collins, GW., Comley, AJ., Coppari, F., Cowan, TE., Cristoforetti, G., Cynn, H., Descamps, A., Dorchies, F., Duff, MJ., Dwivedi, A., Edwards, C., Eggert, JH., Errandonea, D., Fiquet, G., Galtier, E., Garcia, AL., Ginestet, H., Gizzi, L., Gleason, A., Goede, S., Gonzalez, JM., Harmand, M., Hartley, NJ., Heighway, PG., Hernandez-Gomez, C., Higginbotham, A., Höppner, H., Husband, RJ., Hutchinson, TM., Hwang, H., Lazicki, AE., Keen, DA., Kim, J., Koester, P., Konopkova, Z., Kraus, D., Krygier, A., Labate, L., Lee, Y., Liermann, HP., Mason, P., Masruri, M., Massani, B., McBride, EE., MGguire, C., McHardy, JD., Merkel, S., Morard, G., Nagler, B., Nakatsutsumi, M., Nguyen-Cong, K., Norton, AM., Oleynik, II., Otzen, C., Ozaki, N., Pandolfi, S., Peake, DJ., Pelka, A., Pereira, KA., Phillips, JP., Prescher, C., Preston, TR., Randolph, L., Ranjan, D., Ravasio, A., Redmer, R., Rips, J., Santamaria-Perez, D., Savage, DJ., Schoelmerich, M., Schwinkendorf, JP., Smith, J., Sollier, A., Spear, J., Spindloe, C., Stevenson, M., Strohm, C., Suer, TA., Tang, M., Toncian, M., Toncian, T., Tracy, SJ., Trapananti, A., Tschentscher, T., Tyldesley, M., Vennari, CE., Vinci, T., Vogel, SC., Volz, TJ., Vorberger, J., Walsh, JPS., Wark, JS., Willman, JT., Wollenweber, L., Zastrau, U., Brambrink, E., Appel, K. & McMahon, MI., 28 Apr 2024, In: Journal of applied physics. 135, 16, p. 1-11 11 p., 165902.

    Research output: Contribution to journalArticlepeer-review

    Open Access
  • Simple Molecules under High-Pressure and High-Temperature Conditions: Synthesis and Characterization of α- and β-C(NH)2 with Fully sp3-Hybridized Carbon

    Koller, T. J., Jin, S., Krol, V., Ambach, S. J., Ranieri, U., Khandarkhaeva, S., Spender, J., McWilliams, S., Trybel, F., Giordano, N., Poreba, T., Mezouar, M., Kuang, X., Lu, C., Dubrovinsky, L., Dubrovinskaia, N., Hermann, A., Schnick, W. & Laniel, D., 12 Feb 2024, In: Angewandte Chemie. 63, 7, p. 1-6 6 p., e202318214.

    Research output: Contribution to journalArticlepeer-review

    Open Access