scholarly journals Normal-incidence x-ray standing-wave determination of the adsorption geometry of PTCDA on Ag(111): Comparison of the ordered room-temperature and disordered low-temperature phases

2010 ◽  
Vol 81 (12) ◽  
Author(s):  
A. Hauschild ◽  
R. Temirov ◽  
S. Soubatch ◽  
O. Bauer ◽  
A. Schöll ◽  
...  
Keyword(s):  
Low Temperature ◽  
Standing Wave ◽  
Room Temperature ◽  
Normal Incidence ◽  
X Ray ◽  
Adsorption Geometry

scholarly journals Direct measurement of Ni incorporation into Fe3O4(001)

2018 ◽  
Vol 20 (24) ◽  
pp. 16469-16476 ◽  
Author(s):  
P. T. P. Ryan ◽  
Z. Jakub ◽  
J. Balajka ◽  
J. Hulva ◽  
M. Meier ◽  
...  
Keyword(s):  
Standing Wave ◽  
Direct Measurement ◽  
Normal Incidence ◽  
X Ray ◽  
Adsorption Geometry

The normal incidence X-ray standing wave (NIXSW) technique has been used to follow the evolution of the adsorption geometry of Ni adatoms on the Fe3O4(001)-(√2 × √2)R45° surface as a function of temperature.

Structural determination of the (111) -(√3 × √3) 30°- surface using the normal incidence X-ray standing wave method

1995 ◽  
Vol 324 (2-3) ◽  
pp. 122-132 ◽  
Author(s):  
M.F. Kadodwala ◽  
A.A. Davis ◽  
G. Scragg ◽  
B.C.C. Cowie ◽  
M. Kerkar ◽  
...  
Keyword(s):  
Standing Wave ◽  
Normal Incidence ◽  
Structural Determination ◽  
Wave Method ◽  
X Ray ◽  
Standing Wave Method

Single Crystal Growth of High-Pressure Phases of Ice and Salt Hydrate Far Below the Original Melting Point by Mixing Alcohol: Crystal Structure Determination of Magnesium Chloride Heptahydrate

2020 ◽  
Author(s):  
Keishiro Yamashita ◽  
Kazuki Komatsu ◽  
Hiroyuki Kagi
Keyword(s):  
Crystal Structure ◽  
High Pressure ◽  
Crystal Growth ◽  
Single Crystal ◽  
Room Temperature ◽  
Growth Technique ◽  
Salt Hydrate ◽  
X Ray

An crystal-growth technique for single crystal x-ray structure analysis of high-pressure forms of hydrogen-bonded crystals is proposed. We used alcohol mixture (methanol: ethanol = 4:1 in volumetric ratio), which is a widely used pressure transmitting medium, inhibiting the nucleation and growth of unwanted crystals. In this paper, two kinds of single crystals which have not been obtained using a conventional experimental technique were obtained using this technique: ice VI at 1.99 GPa and MgCl<sub>2</sub>·7H<sub>2</sub>O at 2.50 GPa at room temperature. Here we first report the crystal structure of MgCl2·7H2O. This technique simultaneously meets the requirement of hydrostaticity for high-pressure experiments and has feasibility for further in-situ measurements.

The structure of the surface phase: a new normal-incidence X-ray standing wave study

2000 ◽  
Vol 453 (1-3) ◽  
pp. 183-190 ◽  
Author(s):  
G.J. Jackson ◽  
S.M. Driver ◽  
D.P. Woodruff ◽  
B.C.C. Cowie ◽  
R.G. Jones
Keyword(s):  
Standing Wave ◽  
Normal Incidence ◽  
Surface Phase ◽  
New Normal ◽  
X Ray

Structure determination of the 1/1 α/β mixed lactose by X-ray powder diffraction

2005 ◽  
Vol 61 (4) ◽  
pp. 455-463 ◽  
Author(s):  
Jacques Lefebvre ◽  
Jean-François Willart ◽  
Vincent Caron ◽  
Ronan Lefort ◽  
Frédéric Affouard ◽  
...  
Keyword(s):  
Powder Diffraction ◽  
Size Effects ◽  
Room Temperature ◽  
Real Space ◽  
Hydroxyl Groups ◽  
Soft Constraints ◽  
Rietveld Refinements ◽  
X Ray ◽  
Mixed Compound

The mixed form of α/β lactose was obtained by heating amorphous α-lactose at 443 K. NMR spectroscopy determined the stoichiometry of this mixed compound to be 1/1. The X-ray powder diffraction pattern was recorded at room temperature with a sensitive curved detector (CPS 120). The structure was solved by real-space methods (simulated annealing) followed by Rietveld refinements with soft constraints on bond lengths and bond angles. The H atoms of the hydroxyl groups were localized by minimization of the crystalline energy. The cell of 1/1 α/β lactose is triclinic with the space group P1 and contains two molecules (one molecule of each anomer). The crystalline cohesion is achieved by networks of O—H...O hydrogen bonds. The width of the Bragg peaks is interpreted through a microstructural approach in terms of isotropic strain effects and anisotropic size effects.

Single-Crystal X-Ray Scattering Study of Superstructures and Phase Transitions in Graphite-Hno3 and Graphite-Br2 Intercalation Compounds

1982 ◽  
Vol 20 ◽  
Author(s):  
R. Moret ◽  
R. Comes ◽  
G. Furdin ◽  
H. Fuzellier ◽  
F. Rousseaux
Keyword(s):  
Phase Transitions ◽  
Low Temperature ◽  
Room Temperature ◽  
Temperature Phase ◽  
Temperature Structure ◽  
X Ray ◽  
X Ray Scattering ◽  
Scattering Study ◽  
Temperature Liquid ◽  
Low Temperature Phase

ABSTRACTIn α-C5n-HNO3 the condensation of the room-temperature liquid-like diffuse ring associated with the disorder-order transition around 250 K is studied and the low-temperature. superstructure is examined.It is found that β-C8n-HNO3 exhibits an in-plane incommensurate order at room temperature.Two types of graphite-Br2 are found. Low-temperature phase transitions in C8Br are observed at T1 ≍ 277 K and T2 ≍ 297 K. The room-temperature structure of C14Br is reexamined. Special attention is given to diffuse scattering and incommensurability.

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