Results 71 to 80 of about 9,887 (194)

Magnetic susceptibility, EPR, NEXAFS and XPS spectra of Fe-doped CaBi2Nb2O9

Journal of Materials Research and Technology, 2020
In order to study the electronic state of Fe atoms and interatomic exchange interactions in solid solutions of Bi2CaNb2−2xFe2xO9−δ with perovskite structure, methods of magnetic dilution, NEXAFS, XPS and EPR spectroscopy were used.
N.A. Zhuk, V.P. Lutoev, B.A. Makeev, S.V. Nekipelov, A.V. Koroleva, A.V. Fedorova, M.V. Yermolina, D.S. Beznosikov, L.O. Karlova   +8 more
doaj   +1 more source

Exploratory XPS Evidence for Ca–N Environments at the Organic–Mineral Interface in Bone

Surface and Interface Analysis, EarlyView.
ABSTRACT Bone derives its remarkable mechanical properties from the nanoscale relationship between its organic matrix and mineral components. While interfacial interactions are known to affect bone mechanics, direct evidence of chemical bonding at this interface has been lacking.
Richard Leslie Abel, Gwilherm Kerherve, Justin Peter Cobb, Ulrich Hansen   +3 more
wiley   +1 more source

Electronic structure of single-crystalline Sr(Fe$_{1-x}$Co$_x$)$_2$As$_2$ probed by x-ray absorption spectroscopy: Evidence for isovalent substitution of Fe$^{2+}$ by Co$^{2+}$

, 2012
The substitutional dependence of valence and spin-state configurations of Sr(Fe$_{1-x}$Co$_x$)$_2$As$_2$ ($x =$ 0, 0.05, 0.11, 0.17, and 0.38) is investigated with near-edge x-ray absorption fine structure at the $L_{2,3}$ edges of Fe, Co, and As.
Eilers, F., Löhneysen, H. v., Merz, M., Nagel, P., Schuppler, S., Wolf, Th.   +5 more
core   +1 more source

Automated Identification of Thermal Transitions in Conjugated Material Thin Films Using In Situ Optical Spectroscopy

Small Methods, EarlyView.
This study demonstrates the effectiveness of in situ UV−vis coupled with automated data analysis, namely, ATLAS, for fast and reliable identification of multiple thermal transition in conjugated polymer thin films. This ATLAS method will significantly accelerate the understanding of the phase behavior of D‐A polymers with important implications for ...
Doan Vu, Martyn Jevric, Alireza Samadani, Mats R. Andersson, Christopher R. McNeill, Brendan T. O'Connor, Harald Ade   +6 more
wiley   +1 more source

Polysaccharides, Proteins, and Phytoplankton Fragments: Four Chemically Distinct Types of Marine Primary Organic Aerosol Classified by Single Particle Spectromicroscopy

Advances in Meteorology, 2010
Carbon-containing aerosol particles collected in the Arctic and southeastern Pacific marine boundary layers show distinct chemical signatures of proteins, calcareous phytoplankton, and two types of polysaccharides in Near-Edge Absorption X-ray Fine ...
Lelia N. Hawkins, Lynn M. Russell
doaj   +1 more source

Nitrogen doping of TiO2 photocatalyst forms a second eg state in the Oxygen (1s) NEXAFS pre-edge

, 2011
Close inspection of the pre-edge in oxygen near-edge x-ray absorption fine structure spectra of single step, gas phase synthesized titanium oxynitride photocatalysts with 20 nm particle size reveals an additional eg resonance in the VB that went ...
Asahi R., Batzill M., Chen X., Chen X., Chen X., Crocombette J. P., de Groot F. M. F., de Groot F. M. F., Di Valentin C., Fujishima A., Jan J. C., Lee J.-Y., Mastelaro V. R., Nachimuthu P., Nakamura R., Ra W., Stewart S.   +16 more
core   +1 more source

Metal-Induced Gap States at Well Defined Alkali-Halide/Metal Interfaces [PDF]

, 2003
In order to search for states specific to insulator/metal interfaces, we have studied epitaxially grown interfaces with element-selective near edge X-ray absorption fine structure (NEXAFS).
Atsushi Koma, Genki Yoshikawa, Hideo Aoki, Koichiro Saiki, Manabu Kiguchi, Masao Katayama, P. W. Anderson, Ryotaro Arita, S. Altieri, Yoshiaki Tanida   +9 more
core   +2 more sources

Spherulite in the modern aragonitic travertine stromatolite has a calcite core with exopolymers

Sedimentology, EarlyView.
ABSTRACT Spherulites are spherical to ellipsoidal particles formed by various crystalline substances and can be abiotically synthesised in the laboratory. Among various spherulite types, spherulites composed of calcium carbonate are also found in various natural environments, but their abiotic or biotic origins are still controversial.
Fumito Shiraishi, Takayuki Akimoto, Naotaka Tomioka, Satoko Motai, Yoshio Takahashi   +4 more
wiley   +1 more source

NEXAFS investigation of the condensed silane structure(SiH4凝聚态结构的近边X射线吸收精细结构研究)

Zhejiang Daxue xuebao. Lixue ban, 2001
用多重散射团簇方法对低温下凝聚态SiH4进行了Si的1 s NEXAFS理论研究，对不同的模型研究表明，此时凝聚相SiH4形成链状结构.
HEJiang-ping(何江平), TANGJing-chang(唐景昌)   +1 more
doaj   +1 more source

Evidence for short range orbital order in paramagnetic insulating (Al,V)_2O_3

, 2001
The local structure of (Al_0.06V_0.94)_2O_3 in the paramagnetic insulating (PI) and antiferromagnetically ordered insulating (AFI) phase has been investigated using hard and soft x-ray absorption techniques.
A. I. Frenkel, A. Nateprov, A.I. Frenkel, A.L. Ankudinov, A.R. Williams, C. Castellani, C. Castellani, C. Castellani, D.B. McWhan, D.B. McWhan, F. Mila, F.W. Lytle, G.M. Joshi, J. Goulon, J. Spalek, J. Will, J.-H. Park, K. Held, L. Tröger, L.F. Mattheiss, M. Klemm, M. L. denBoer, M.J. Rozenberg, O. Müller, P. Pfalzer, P. Pfalzer, P.D. Dernier, P.D. Dernier, R. Shiina, S. Calvin, S. Horn, S.Y. Ezhov, V. Eyert, V. Eyert, V. Eyert, V. Eyert, W. Bao, W. Bao   +37 more
core   +1 more source