The birth of time-of-flight (TOF) neutron powder diffraction at pulsed neutron source (invited)

2015 ◽  
Vol 50 (9-10) ◽  
pp. 705-715 ◽  
Author(s):  
Izabela M. Sosnowska
Keyword(s):  
Neutron Source ◽  
Powder Diffraction ◽  
Time Of Flight ◽  
Neutron Powder Diffraction ◽  
Pulsed Neutron ◽  
Pulsed Neutron Source

Neutron powder diffraction studies at high pressure using a pulsed neutron source

1996 ◽  
Vol 14 (4-6) ◽  
pp. 295-302
Author(s):  
H. Takahashi ◽  
N. Mori ◽  
T. Matsumoto ◽  
T. Kamiyama ◽  
H. Asano
Keyword(s):  
High Pressure ◽  
Neutron Source ◽  
Powder Diffraction ◽  
Neutron Powder Diffraction ◽  
Pulsed Neutron ◽  
Pulsed Neutron Source

scholarly journals Neutron Powder Diffraction at a Pulsed Neutron Source: A study of Resolution Effects

1985 ◽  
Vol 29 ◽  
pp. 119-130
Author(s):  
J. Faber ◽  
R. L. Hitterman
Keyword(s):  
Neutron Source ◽  
Time Of Flight ◽  
General Purpose ◽  
Neutron Powder Diffraction ◽  
Scattering Data ◽  
Dependent Data ◽  
Resolution Function ◽  
Flight Data ◽  
Pulsed Neutron ◽  
Pulsed Neutron Source

AbstractThe General Purpose Powder Diffractometer (GPPD), a high resolution (∆d/d=0.002) time-of-flight instrument, exhibits a resolution function that is almost independent of d-spacing. Some of the special properties of time-of-flight scattering data obtained at a pulsed neutron source will be discussed. A method is described that transforms wavelength dependent data, obtained at a pulsed neutron source, so that standard structural least-squares analyses can be applied. Several criteria are given to show when these techniques are useful in time-of-flight data analysis.

scholarly journals Rietveld refinement of magnetic structures from pulsed-neutron-source powder-diffraction data

1995 ◽  
Vol 213-214 ◽  
pp. 985-989 ◽  
Author(s):  
R.A. Robinson ◽  
A.C. Lawson ◽  
Allen C. Larson ◽  
R.B. Von Dreele ◽  
J.A. Goldstone
Keyword(s):  
Rietveld Refinement ◽  
Neutron Source ◽  
Powder Diffraction ◽  
Diffraction Data ◽  
Powder Diffraction Data ◽  
Magnetic Structures ◽  
Pulsed Neutron ◽  
Pulsed Neutron Source

Electronically focused time-of-flight powder diffractometers at the intense pulsed neutron source

1989 ◽  
Vol 22 (4) ◽  
pp. 321-333 ◽  
Author(s):  
J. D. Jorgensen ◽  
J. Faber ◽  
J. M. Carpenter ◽  
R. K. Crawford ◽  
J. R. Haumann ◽  
...  
Keyword(s):  
High Resolution ◽  
Neutron Source ◽  
Rietveld Method ◽  
Time Of Flight ◽  
Scattering Angle ◽  
Wide Range ◽  
Pulsed Neutron ◽  
Pulsed Neutron Source

Two time-of-flight powder diffractometers have operated at the Intense Pulsed Neutron Source (IPNS) since August 1981. These instruments use dedicated microcomputers to focus time-of-flight events so that data from different detectors can be summed into a single histogram. Thus, large multidetector arrays can be employed at any scattering angle from 12 to 157°. This design permits data to be collected over a uniquely wide range of d spacings while maintaining high resolution and count rates. The performance of the two instruments is evaluated by analyzing data from a standard Al2O3 sample by the Rietveld method. These instruments provide the capability for moderate- to high-resolution measurements with the duration of a typical run being a few hours.

A Fast Pulsed Neutron Source for Time-of-Flight Detection of Nuclear Materials and Explosives

2011 ◽  
Author(s):  
Mahadevan Krishnan ◽  
Brian Bures ◽  
Colt James ◽  
Robert Madden ◽  
Wolfgang Hennig ◽  
...  
Keyword(s):  
Neutron Source ◽  
Time Of Flight ◽  
Nuclear Materials ◽  
Pulsed Neutron ◽  
Pulsed Neutron Source

Applications of Pulsed Neutron Powder Diffraction to Actinide Elements

1987 ◽  
Vol 31 ◽  
pp. 385-393
Author(s):  
A. C. Lawson ◽  
B. Cort ◽  
C. E. Olsen ◽  
J. W. Richardson ◽  
M. H. Mueller ◽  
...  
Keyword(s):  
Powder Diffraction ◽  
Time Of Flight ◽  
Surface Oxidation ◽  
Neutron Powder Diffraction ◽  
Fused Silica ◽  
Quality Data ◽  
Polymorphic Transformations ◽  
Structural Problems ◽  
Pulsed Neutron ◽  
Actinide Elements

We have been using the technique of pulsed neutron powder diffraction to study several problems in the physics and chemistry of the actinide elements. In these elements one often encounters very complex structures resulting from polymorphic transformations presumably induced by the presence of 5f-electrons. For exampie, at least five distinct structures of plutonium metal are found between room temperature and its melting point of 640°C, and two of the structures are monoclinic! Single crystals are usually not available, and the high resolution which is intrinsic to the time-of-flight powder technique is a powerful tool in the solution of complex structural problems. The relatively low absorption coefficients for neutrons for at least some actinide isotopes is an advantage when surface oxidation is a problem (as in high-temperature experiments) and provides good particle statistics so that high-quality data are available for Rietveld refinement. The low absorption of neutrons by other materials such as vanadium and fused silica enables the use of these materials for the containment of samples in high- and low-temperature environments, and the fixed geometry of the time-of-flight technique simplifies the design of furnaces and cryostats.

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