نتایج جستجو برای: neutron diffraction

تعداد نتایج: 106724  

Journal: :Nihon Kessho Gakkaishi 2004

Journal: :École thématique de la Société Française de la Neutronique 2014

2006
Simon J.L. Billinge

Neutron diffraction has proven to be an indispensable and highly significant tool since its development 60 years ago. The neutron has unique properties that yield distinct information unavailable otherwise. Chief among these properties is the relative uniformity of the neutron scattering power of atoms across the periodic table, allowing the accurate structure determination of materials compose...

2008
A. D. Christianson E. A. Goremychkin J. S. Gardner H. J. Kang J.-H. Chung P. Manuel J. D. Thompson J. L. Sarrao J. M. Lawrence

The specific heat of Ce3Co4Sn13 exhibits a crossover from heavy Fermion behavior with antiferromagnetic correlations at low field to single impurity Kondo behavior above 2T. We have performed neutron diffraction measurements in magnetic fields up to 6T on single crystal samples. The (0 0 1) position shows a dramatic increase in intensity in field which appears to arise from static polarization ...

Journal: :Acta crystallographica. Section B, Structural science 2006
Charlotte K Leech Sarah A Barnett Kenneth Shankland Matthias Gutmann Chick C Wilson

The structures of both known forms of the polymorphic material ortho-acetamidobenzamide, C(9)H(10)N(2)O(2), have been determined by low-temperature neutron single-crystal diffraction. Neutron diffraction allows the full description of the H-atom positions in this molecular material, which is vital in benchmarking related crystal-structure predictions. Significant conformational differences are ...

2013
Gerhard Fecher Hartmut Fuess

The crystal structure of the high temperature phase of anilinium bromide, CeH5NH3®Br , was studied by X-ray and neutron diffraction at T = 343 K . The refinement supports disordered positions of the —NH3® group. A split-atom model is proposed which includes disorder of the benzene ring. The thermal parameters, hydrogen bond distances, and other experimental data (NMR, N Q R , inelastic neutron ...

2011
Muhammed Yousufuddin

Neutron diffraction is the method of choice when locating chemically interesting hydrogen atoms, particularly in systems containing a heavy metal. In this article, two fascinating complexes containing hydrogen atoms that were unambiguously located with neutron diffraction will be highlighted. The first complex, OsH3Cl(PPh3)3, is a Kubas-type complex containing a rare elongated dihydrogen ligand...

2002
A. J. Burggraaf T. van Dijk M. J. Verkerk

High oxygen conductivities can be achieved in cation ordered LnxZrl_=O2_l x (Ln=Gd, Nd) solid solutions with pyrochlore (P) structure. High values of the pre-exponentlal factor °o are correlated with the degree of anion disorder in the 8b oxygen sublattice (neutron diffraction). The activation energy AH is lowered by cation ordering (F-P transition; effect of x) due to the occurence of a prefer...

2013
P. P. Nath S. Sarkar P. S. R. Krishna R. N. Joarder

An analysis of neutron diffraction data of liquid deuterated terr-butanol at room temperature to determine its molecular conformation is presented. Being a big molecule of 15 sites, the analysis is tricky and needs careful consideration. The resulting molecular parameters are compared with those obtained from other experimental data analysis and model calculations. The information about the int...

2010
Katharina Fucke

A review. Diffraction methods are a powerful tool to investigate the crystal structure of organic compounds in general and their hydrates in particular. The laboratory standard technique of single crystal X-ray diffraction gives information about the molecular conformation, packing and hydrogen bonding in the crystal structure, while powder X-ray diffraction on bulk material can trace hydration...

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