Search Results - "Heald, S M"

Intrinsic ferromagnetism in insulating cobalt doped anatase TiO2 by GRIFFIN, K. A, PAKHOMOV, A. B, WANG, C. M, HEALD, S. M, KRISHNAN, Kannan M

“…Using complementary experiments we show that the room temperature ferromagnetism observed in anatase Co:TiO(2) films is not carrier mediated, but coexists with…”
Get full text

Chemical natures and distributions of metal impurities in multicrystalline silicon materials by Buonassisi, T., Istratov, A. A., Pickett, M. D., Heuer, M., Kalejs, J. P., Hahn, G., Marcus, M. A., Lai, B., Cai, Z., Heald, S. M., Ciszek, T. F., Clark, R. F., Cunningham, D. W., Gabor, A. M., Jonczyk, R., Narayanan, S., Sauar, E., Weber, E. R.

“…We present a comprehensive summary of our observations of metal‐rich particles in multicrystalline silicon (mc‐Si) solar cell materials from multiple vendors,…”
Get full text

The impact of crystal symmetry on the electronic structure and functional properties of complex lanthanum chromium oxides by Qiao, Liang, Xiao, Haiyan Y., Heald, Steve M., Bowden, Mark E., Varga, Tamas, Exarhos, Gregory J., Biegalski, Michael D., Ivanov, Ilia N., Weber, William J., Droubay, Timothy C., Chambers, Scott A.

“…Complex oxides exhibit a wide range of crystal structures, chemical compositions and physical properties. The underlying drivers determining the complicated…”
Get full text

Reduction of Tc(VII) by Fe(II) Sorbed on Al (hydr)oxides by Peretyazhko, T, Zachara, J. M, Heald, S. M, Kukkadapu, R. K, Liu, C, Plymale, A. E, Resch, C. T

“…Under oxic conditions, Tc exists as the soluble, weakly sorbing pertechnetate [TcO4 −] anion. The reduced form of technetium, Tc(IV), is stable in anoxic…”
Get full text

Charge transfer-tuned magnetism in Nd-substituted Gd5Si4 by Kou, R. H., Gao, J., Ren, Y., Sanyal, B., Bhandary, S., Heald, S. M., Fisher, B., Sun, C.-J.

“…We report a charge-transfer mechanism in tuning of magnetism of Nd-substituted Gd5-xNdxSi4 (x=1 and 2.5) compounds. The X-ray absorption near edge structure…”
Get full text

Transition metal co-precipitation mechanisms in silicon by Buonassisi, T., Heuer, M., Istratov, A.A., Pickett, M.D., Marcus, M.A., Lai, B., Cai, Z., Heald, S.M., Weber, E.R.

“…Formation mechanisms of precipitates containing multiple-metal species in silicon are elucidated by nano-scale morphology and phase investigations performed by…”
Get full text

The Discovery and Study of Nanocrystalline TiO2-(MoO3) Core−Shell Materials by Elder, S. H, Cot, F. M, Su, Y, Heald, S. M, Tyryshkin, A. M, Bowman, M. K, Gao, Y, Joly, A. G, Balmer, M. L, Kolwaite, Ana C, Magrini, K. A, Blake, D. M

“…Here we report the synthesis of a series of new nanocrystalline TiO2-(MoO3) core−shell materials whose photoabsorption energy (PE, the energy required to…”
Get full text

Transition metals in photovoltaic-grade ingot-cast multicrystalline silicon: Assessing the role of impurities in silicon nitride crucible lining material by Buonassisi, T., Istratov, A.A., Pickett, M.D., Rakotoniaina, J.-P., Breitenstein, O., Marcus, M.A., Heald, S.M., Weber, E.R.

“…We assess the contamination potential of crucibles used during directionally solidified multicrystalline silicon (mc-Si) ingot casting for cost-effective solar…”
Get full text

Pertechnetate (TcO4−) reduction by reactive ferrous iron forms in naturally anoxic, redox transition zone sediments from the Hanford Site, USA by Peretyazhko, T.S., Zachara, J.M., Kukkadapu, R.K., Heald, S.M., Kutnyakov, I.V., Resch, C.T., Arey, B.W., Wang, C.M., Kovarik, L., Phillips, J.L., Moore, D.A.

“…Technetium is an important environmental contaminant introduced by the processing and disposal of irradiated nuclear fuel and atmospheric nuclear tests. Under…”
Get full text

Synthesis and properties of titanomagnetite (Fe3−xTixO4) nanoparticles: A tunable solid-state Fe(II/III) redox system by Pearce, C.I., Qafoku, O., Liu, J., Arenholz, E., Heald, S.M., Kukkadapu, R.K., Gorski, C.A., Henderson, C.M.B., Rosso, K.M.

“…[Display omitted] ► Fe3−xTixO4 nanoparticles (10–12nm) synthesized by aqueous precipitation. ► Composition, structure, magnetic properties of Fe3−xTixO4…”
Get full text

Tc(VII) reduction kinetics by titanomagnetite (Fe3−xTixO4) nanoparticles by Liu, J., Pearce, C.I., Qafoku, O., Arenholz, E., Heald, S.M., Rosso, K.M.

“…Technetium contamination remains a major environmental problem at nuclear reprocessing sites, such as at the Hanford nuclear reservation, Washington, USA. Here…”
Get full text

Lack of ferromagnetism in n-type cobalt-doped ZnO epitaxial thin films by Kaspar, T C, Droubay, T, Heald, S M, Nachimuthu, P, Wang, C M, Shutthanandan, V, Johnson, C A, Gamelin, D R, Chambers, S A

Get full text

Room-temperature ferromagnetism in ion-implanted Co-doped TiO2(110) rutile by Shutthanandan, V., Thevuthasan, S., Heald, S. M., Droubay, T., Engelhard, M. H., Kaspar, T. C., McCready, D. E., Saraf, L., Chambers, S. A., Mun, B. S., Hamdan, N., Nachimuthu, P., Taylor, B., Sears, R. P., Sinkovic, B.

“…Ferromagnetic Co-doped rutile TiO2 single crystals were synthesized by high-temperature ion implantation and characterized by a variety of techniques. Co is…”
Get full text

Negligible magnetism in excellent structural quality CrxTi1-xO2 anatase : Contrast with high-TC ferromagnetism in structurally defective CrxTi1-xO2 by KASPAR, T. C, HEALD, S. M, CHAMBERS, S. A, WANG, C. M, BRYAN, J. D, DROUBAY, T, SHUTTHANANDAN, V, THEVUTHASAN, S, MCCREADY, D. E, KELLOCK, A. J, GAMELIN, D. R

Get full text

Advanced spectroscopic synchrotron techniques to unravel the intrinsic properties of dilute magnetic oxides: the case of Co:ZnO by Ney, A, Opel, M, Kaspar, T C, Ney, V, Ye, S, Ollefs, K, Kammermeier, T, Bauer, S, Nielsen, K-W, Goennenwein, S T B, Engelhard, M H, Zhou, S, Potzger, K, Simon, J, Mader, W, Heald, S M, Cezar, J C, Wilhelm, F, Rogalev, A, Gross, R, Chambers, S A

Get full text

Nature of the charge carriers in electron-doped copper oxide superconductors by Tranquada, J. M, Heald, S. M, Moodenbaugh, A. R, Liang, G, Croft, M

“…Research on the prototypical hole-doped superconductor system is discussed. The nature of carrier states was studied to obtain details about electron-pairing…”
Get full text

Ferromagnetism in oxide semiconductors by Chambers, S.A., Droubay, T.C., Wang, C.M., Rosso, K.M., Heald, S.M., Schwartz, D.A., Kittilstved, K.R., Gamelin, D.R.

“…Over the past five years, considerable work has been carried out in the exploration of candidate diluted oxide magnetic semiconductors with high Curie…”
Get full text

Characterization of natural titanomagnetites (Fe3−xTixO4) for studying heterogeneous electron transfer to Tc(VII) in the Hanford subsurface by Pearce, C.I., Liu, J., Baer, D.R., Qafoku, O., Heald, S.M., Arenholz, E., Grosz, A.E., McKinley, J.P., Resch, C.T., Bowden, M.E., Engelhard, M.H., Rosso, K.M.

“…Sediments with basaltic provenance, such as those at the Hanford nuclear reservation, Washington, USA, are rich in Fe-bearing minerals of mixed valence. These…”
Get full text

Investigation of Heat-Assisted Magnetic Recording Media Films in Four Dimensions by Sun, C. J., Xu, D. B., Brewe, D. L., Chen, J. S., Heald, S. M., Chow, G. M.

“…Heat-assisted magnetic recording is one of the most promising approaches to achieve extremely high density magnetic recording. A laser is used to temporarily…”
Get full text

A short working distance multiple crystal x-ray spectrometer by Dickinson, B, Seidler, G T, Webb, Z W, Bradley, J A, Nagle, K P, Heald, S M, Gordon, R A, Chou, I M

“…For x-ray spot sizes of a few tens of microns or smaller, a millimeter-sized flat analyzer crystal placed approximately 1 cm from the sample will exhibit high…”
Get more information