Time-of-flight powder diffraction test experiments at a pulsed neutron beam using the position-sensitive detector JULIOS

AbstractTime resolved X-ray powder diffraction was used to follow the crystallization processes in the systems MgO-MgCl2-H2O and MgO-H2O. A Stoe X-ray powder diffractometer with a position sensitive detector was used. The crystalline reaction products are [Mg2(OH)3(H2O)2]C1.H2O and Mg(OH)2 dependent upon the MgC12 concentrations in the heterogeneous systems. Mg(OH)2 was the product in a 1.50 M MgCl2 solution and [Mg2(OH)3(H2O)3]Cl.H2O was formed in 3.00 and 5.17 M MgCl2 solutions at 20°C.

Download Full-text

New beam line for time-of-flight medium energy ion scattering with large area position sensitive detector

Review of Scientific Instruments ◽

10.1063/1.4750195 ◽

2012 ◽

Vol 83 (9) ◽

pp. 095107 ◽

Cited By ~ 43

Author(s):

M. K. Linnarsson ◽

A. Hallén ◽

J. Åström ◽

D. Primetzhofer ◽

S. Legendre ◽

...

Keyword(s):

Time Of Flight ◽

Beam Line ◽

Position Sensitive Detector ◽

Sensitive Detector ◽

Medium Energy ◽

Ion Scattering ◽

Large Area ◽

Position Sensitive ◽

Medium Energy Ion Scattering

Download Full-text

Refinement of the Structure of MnSi by Powder Diffraction

Powder Diffraction ◽

10.1017/s0885715600017504 ◽

1991 ◽

Vol 6 (4) ◽

pp. 194-195 ◽

Cited By ~ 18

Author(s):

Jens-Erik Jørgensen ◽

Svend Erik Rasmussen

Keyword(s):

Lattice Constant ◽

Powder Diffraction ◽

Rietveld Method ◽

Internal Standard ◽

Position Sensitive Detector ◽

Intensity Data ◽

Sensitive Detector ◽

Crystal Data ◽

Position Sensitive

AbstractCrystal data and results of structure refinements for MnSi are reported. The material is cubic, P213, with a = 4.5603(2) Å, Vd = 94.84(1) Å3, Z = 4, Dx = 5.815 Mg/m3. Intensity data were obtained from a Stoe transmission type diffractometer equipped with a position sensitive detector. CuKα1 radiation, λ = 1.5405981 Å was employed. Germanium was used as an internal standard for the determination of the lattice constant (aGe= 5.6582 Å). The structure was refined by the Rietveld method by aid of three different programs.

Download Full-text

Crystal structure determination of lithium diborate hydrate, LiB2O3(OH).H2O, from X-ray powder diffraction data collected with a curved position-sensitive detector

Journal of Applied Crystallography ◽

10.1107/s0021889892004801 ◽

1992 ◽

Vol 25 (5) ◽

pp. 617-623 ◽

Cited By ~ 20

Author(s):

D. Louër ◽

M. Louër ◽

M. Touboul

Keyword(s):

Crystal Structure ◽

Powder Diffraction ◽

Diffraction Data ◽

Structural Model ◽

Rietveld Method ◽

Position Sensitive Detector ◽

X Rays ◽

Sensitive Detector ◽

Powder Diffraction Data ◽

Position Sensitive

The crystal structure of lithium diborate hydrate, LiB2O3(OH).H2O, has been solved ab initio and refined by the Rietveld method from powder diffraction data collected with a curved position-sensitive detector (INEL CPS120) using Debye–Scherrer diffraction geometry with monochromatic X-rays. In the first stage the indexing of the powder pattern was performed by the successive dichotomy method from data collected with a diffractometer using Bragg–Brentano geometry. The lattice parameters are a = 9.7984 (10), b = 8.2759 (7) and c = 9.6138 (8) Å and the space group is Pnna. The structural model was obtained from direct methods and two difference Fourier maps. The Rietveld refinement converged to final crystal structure and profile indicators RF = 0.05, RB = 0.05, Rp = 0.03 and Rwp = 0.04. The structure consists of BO4 tetrahedra (T) and BO2(OH) triangles (Δ) sharing corners in order to form infinite chains along [010], with the shorthand notation 3:∞1(Δ + 2T). The particular linkage of the B3O3 rings leads to a new diborate anion {[B2O3(OH)] n− n }, in which two tetrahedral B atoms have an occupation factor of 0.5. Li atoms, tetrahedrally surrounded by four O atoms, three belonging to separate chains and one to a water molecule maintain the cohesion of the structure.

Download Full-text