نتایج جستجو برای: x ray diffraction ordering

تعداد نتایج: 719244  

2007
Taras Radchenko Valentyn Tatarenko Hélèna Zapolsky

1. Introduction Ordering in solid solutions is a topic of growing technological and scientific interest within the field of material science. This is because of the advantageous high temperature and corrosion properties of alloys which are linked to the effect of long-range ordering [1]. Long-range order kinetics is one of the diffusion processes occurring within the atomic ranges. X-ray diffra...

2016
M. Lingg J. Hulliger

Preparation methods (ceramic and sol–gel methods) using reducing conditions were optimized for the formation of phase pure double perovskites of Sr2FeMo(1 x)WxO6 (0 # x # 1) showing enhanced homogeneity and cation ordering for investigating magnetic properties. X-ray diffraction (XRD) revealed a structural transition from tetragonal to monoclinic as W replaces Mo (x 1⁄4 0.5–0.6). The SQUID magn...

Journal: :Chemistry of materials : a publication of the American Chemical Society 2012
Jordi Cabana Montserrat Casas-Cabanas Fredrick O Omenya Natasha A Chernova Dongli Zeng M Stanley Whittingham Clare P Grey

A study of the correlations between the stoichiometry, secondary phases and transition metal ordering of LiNi(0.5)Mn(1.5)O(4) was undertaken by characterizing samples synthesized at different temperatures. Insight into the composition of the samples was obtained by electron microscopy, neutron diffraction and X-ray absorption spectroscopy. In turn, analysis of cationic ordering was performed by...

2016
F. Rieutord J. J. Benattar L. Bosio

2014 The structures of thin lamellar films can be determined through a combination of three X-ray experiments using synchrotron radiation. Diffraction experiments in the transmission geometry give the intralamellar ordering, the diffraction at small glancing angles yields the interlamellar organization, and the critical reflection provides the density measurement which is required to obtain the...

Journal: :Physical review letters 2012
S L Johnson R A de Souza U Staub P Beaud E Möhr-Vorobeva G Ingold A Caviezel V Scagnoli W F Schlotter J J Turner O Krupin W-S Lee Y-D Chuang L Patthey R G Moore D Lu M Yi P S Kirchmann M Trigo P Denes D Doering Z Hussain Z-X Shen D Prabhakaran A T Boothroyd

We report on the ultrafast dynamics of magnetic order in a single crystal of CuO at a temperature of 207 K in response to strong optical excitation using femtosecond resonant x-ray diffraction. In the experiment, a femtosecond laser pulse induces a sudden, nonequilibrium increase in magnetic disorder. After a short delay ranging from 400 fs to 2 ps, we observe changes in the relative intensity ...

Journal: :Physical review. E, Statistical physics, plasmas, fluids, and related interdisciplinary topics 1996
Raghunathan Katsaras

The structure of the Lc8 phase exhibited by hydrated dipalmitoylphosphatidylcholine ~DPPC! was recently determined by Raghunathan and Katsaras @Phys. Rev. Lett. 74, 4456 ~1995!# from x-ray diffraction studies on oriented multibilayers. Here, we reanalyze the powder diffraction data reported in the literature on a number of hydrated lipids possessing the phosphatidylcholine headgroup. As in DPPC...

2005
Julien Bréger Meng Jiang Nicolas Dupré Ying S. Meng Yang Shao-Horn Gerbrand Ceder Clare P. Grey

X-ray diffraction patterns of Li[Li(1 2x)/3NixMn2/3 x/3]O2 show reflections between 201 and 351, 2y (CuKa) due to Li2MnO3-like ordering of the transition metal (Ni, Mn and Li) layers. The ordering is rarely perfect, resulting in characteristic broadening and changes in the intensities of these reflections. Li MAS NMR studies of Li2MnO3 show that the [Li1/3Mn2/3] layers are well ordered, the dis...

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