1 / 5

HIPPO is the Flagship for the Geomaterials Focus Area at Lujan Center

HIPPO is the Flagship for the Geomaterials Focus Area at Lujan Center. High pressure-high temperature diffraction is needed to meet BES and DP goals to understand ultrahigh pressure materials Examples of high impact user research

chione
Télécharger la présentation

HIPPO is the Flagship for the Geomaterials Focus Area at Lujan Center

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. HIPPO is the Flagship for the Geomaterials Focus Area at Lujan Center • High pressure-high temperature diffraction is needed to meet BES and DP goals to understand ultrahigh pressure materials • Examples of high impact user research • H.R. Wenk (UC Berkeley)Geology33, 273-276 (2005) Meteorite shock texture • W. Mao (LANL) & RJ. Mao (Carnegie), Science297, 2247-9 (2002) Gas hydrates • R. Hemley (Carnegie), YS Zhao (LANL) APL86, 052505 wustite magnetism @ 20 GPa • W Mao (LANL) & RJ Mao (Carnegie), PNAS101, 708-710 (2004) H storage compounds INSTRUMENTATION & PERSONNEL High Pressure Yusheng Zhao HIPPO Sven Vogel FDS Luc Daemen NPDF Thomas Proffen SPECTROMETER DEVELOPMENT TEAMS AND SPONSORS REFLECT DIVERSITY HIPPO: UCBerkeley, UCDavis, BES NPDF: UPenn, UVirginia, NSF, LDRD, BES FDS: LDRD, BES High Pressure: LANL-DP, LDRD, BES EDUCATION LANSCE Neutron Scattering School HIPPO workshops from Lujan Center in the SNS Era Workshop September 17-19, 2006, Santa Fe FDS: Currently competitive with TOSCA (ISIS). “Until the SNS VISION spectrometer comes on line in 2012-2013 FDS will play an important role in satisfying the [research] demand … in hydrogen materials.” Diffraction: “Three diffractometers, NPDF, HIPPO, and PCS have unique diffraction and sample-environment capabilities and experimental focus not found anywhere in the world; they will be fully competitive for a long time to come.”

  2. Neutron texture measurements determine direction of meteorite impact HIPPO specializes in texture at high temperature and pressure HIPPO Sven Vogel instrument scientist • Scientific Challenge • Vredefort impact crater in South Africa is 2 billion years old • Shock-modified minerals exist in the crater • Can one determine the direction of impact from the shock modifications? • Approach • Measure texture of Vredefort quartzite • Compare to texture of lab-shocked quartzite • Determine stiffness of various directions in quartzite • Result • Texture of Vredefort meteorite is similar to lab-compressed quartzite • Direction of shock wave can be determined from texture • 1Wenk, H. R., 1Lonardelli, I.,2Vogel, S. C., 1Tullis, J., “Dauphine twinning as evidence for an impact origin of preferred orientation in quartzite: An example from Vredefort, South Africa”, Geology33, 273-276 (2005) • 1University of California at Berkeley • 2Los Alamos National Laboratory Shock direction [0111] Samples “remember” shock direction by texture anisotropy

  3. Spectrometer for Materials Research at Temperature and Stress (SMARTS)

  4. SMARTS is used to study nonlinear mechanical behavior of geomaterials.

  5. A “glassy” phase in sandstone has been discovered through PDF Measurements on NPDF. • Goal: Relate unusual acoustic properties to local atomic structure. • Technique: Pair Distribution Function (PDF) measured on NPDF gives local structural information. • Result: Evidence for a “glassy” phase in Fontainebleau sandstone rock. Excess Si-O and O-O nearest neighbors indicating “glassy” contribution. K.L. Page, Th. Proffen, S.E. McLain, T.W. Darling and J.A. TenCate,Local Atomic Structure of Fontainebleau Sandstone: Evidence for an Amorphous Phase?, Geophysical Research Lett. (2004).

More Related