Part 1: X-Ray High-Angle Scattering and Ultrasonic-Measurements

1980 ◽  
Vol 35 (9) ◽  
pp. 930-937 ◽  
Author(s):  
Gerhard Hermann ◽  
Richard Bek ◽  
Siegfried Steeb
Keyword(s):  
Concentration Dependence ◽  
Critical Concentration ◽  
Distribution Functions ◽  
X Ray ◽  
Coordination Numbers ◽  
Long Wavelength ◽  
X Ray Scattering ◽  
Structure Factors ◽  
Angle Scattering ◽  
Pair Distribution Functions

Abstract By means of X-ray scattering and ultrasonic experiments, the structure of different melts of the Cd-Ga system was investigated. The structure factors S (q) obtained for the pure elements agree well with those reported by other authors. The concentration dependence of the structure factors shows no special features. From the structure factors, the total pair-distribution functions were calculated by a Fourier transformation. The nearest-neighbour distances, obtained from the total pair-distribution functions, amount to 3.04 Å for pure Cd and 2.83 Å for pure Ga and are nearly constant for all alloys. The concentration dependence of the experimental nearest-neigh-bour distances and coordination numbers was determined and is compared with statistical distribution and macroscopic segregation models. These comparisons tend to indicate a preference for like-atom neighbours. From the long-wavelength limit S(0) of the structure factors of Cd and Ga, the isothermal compressibilities were calculated. These show a satisfactory agreement with those calculated from adiabatic sound velocity data. The anomalous ultrasonic absorption of a single melt with nearly critical concentration indicates the existence of concentration fluctuations. This result is in agreement with those obtained by X-ray smallangle scattering experiments which are described in Part 2 of this work [1].

Extracting differential pair distribution functions usingMIXSCAT

2010 ◽  
Vol 43 (3) ◽  
pp. 635-638 ◽  
Author(s):  
Caroline Wurden ◽  
Katharine Page ◽  
Anna Llobet ◽  
Claire E. White ◽  
Thomas Proffen
Keyword(s):  
Distribution Functions ◽  
Program Package ◽  
Scattering Data ◽  
X Ray ◽  
Differential Structure ◽  
Structure Factors ◽  
Differential Pair ◽  
User Friendly ◽  
Pair Distribution Functions

Differently weighted experimental scattering data have been used to extract partial or differential structure factors or pair distribution functions in studying many materials. However, this is not done routinely partly because of the lack of user-friendly software. This paper presentsMIXSCAT, a new member of theDISCUSprogram package.MIXSCATallows one to combine neutron and X-ray pair distribution functions and extract their respective differential functions.

Structure of Molten Mg, Ca, Sr, and Ba by X-ray Diffraction

1975 ◽  
Vol 30 (6-7) ◽  
pp. 801-805 ◽  
Author(s):  
Y. Waseda ◽  
K. Yokoyama ◽  
K. Suzuki
Keyword(s):  
Structural Information ◽  
Distribution Functions ◽  
X Ray Diffraction ◽  
Interatomic Distances ◽  
X Ray ◽  
Coordination Numbers ◽  
Structure Factors ◽  
Atomic Radial Distribution ◽  
Electron Transport Properties ◽  
Diffraction Patterns

Abstract X-ray diffraction patterns have been measured on molten alkaline earth metals (Mg, Ca, Sr, and Ba) in the temperature range from the melting points to 880 °C. In all cases the structure factors obtained were temperature insensitive. By the usual Fourier transformation of the structure factors, the atomic radial distribution functions were evaluated. From these the interatomic distances and coordination numbers were estimated. The structural information was applied to a discussion of the electron-transport properties using the Ziman theory.

scholarly journals X-ray Scattering and O–O Pair-Distribution Functions of Amorphous Ices

2018 ◽  
Vol 122 (30) ◽  
pp. 7616-7624 ◽  
Author(s):  
Daniel Mariedahl ◽  
Fivos Perakis ◽  
Alexander Späh ◽  
Harshad Pathak ◽  
Kyung Hwan Kim ◽  
...  
Keyword(s):  
Distribution Functions ◽  
X Ray ◽  
X Ray Scattering ◽  
Amorphous Ices ◽  
Pair Distribution Functions ◽  
Ray Scattering

Combination of EXAFS and Differential Anomalous X-ray Scattering for Studying Ni 2 Zr Amorphous Alloy

1992 ◽  
Vol 47 (12) ◽  
pp. 1191-1196 ◽  
Author(s):  
Yu. A. Babanov ◽  
A. F. Sidorenko ◽  
V. R. Shvetsov ◽  
M. Bionducci ◽  
G. Licheri ◽  
...  
Keyword(s):  
Amorphous Alloy ◽  
Mechanical Alloying ◽  
Distribution Functions ◽  
Anomalous Scattering ◽  
X Ray ◽  
Amorphous Sample ◽  
X Ray Scattering ◽  
Partial Distribution ◽  
Pair Distribution Functions ◽  
Ray Scattering

Abstract In this paper we report a first application of the new idea of combining EXAFS and differential anomalous scattering techniques to obtain partial distribution functions for a binary amorphous sample. This method has been successfully employed in extracting Ni-Ni and Ni-Zr pair distribution functions for Ni2Zr prepared by mechanical alloying. A comparison with results from previous studies is also reported.

Interference and Radial Distribution Functions of Liquid Copper, Silver, Tin, and Mercury

1965 ◽  
Vol 20 (3) ◽  
pp. 325-335 ◽  
Author(s):  
C. N. J. Wagner ◽  
H. Ocken ◽  
M. L. Joshi
Keyword(s):  
Radial Distribution ◽  
Liquid Copper ◽  
Pulse Height ◽  
Distribution Functions ◽  
Radial Distribution Functions ◽  
Interatomic Distances ◽  
X Ray ◽  
Coordination Numbers ◽  
X Ray Scattering ◽  
Good Agreement

The x-ray scattering from liquid copper, silver, tin, and mercury was measured at temperatures of 1125°C, 1050°C, 335°C, and 28°C, respectively, from the open surface of horizontal samples using a focusing theta-theta diffractometer, quartz crystal monochromator positioned in the diffracted beam, scintillation detector, and pulse height discriminator. The effect on the measured intensities of the positioning of the sample with respect to the diffractometer axis and the meniscus of the liquid were considered. Calibration of the primary beam intensity by measurements on liquid mercury provided an alternate check of the standard normalization procedures for copper, silver, and tin. After calculation of the interference functions, atomic and radial distribution functions were evaluated from which interatomic distances and coordination numbers were obtained. The interatomic distances in the liquid were in good agreement with the GOLDSCHMIDT diameters of the respective elements.

scholarly journals A Review of High-Energy X-Ray Diffraction from Glasses and Liquids

2012 ◽  
Vol 2012 ◽  
pp. 1-19 ◽  
Author(s):  
C. J. Benmore
Keyword(s):  
Amorphous Materials ◽  
Rapid Development ◽  
High Energy ◽  
Distribution Functions ◽  
Future Research ◽  
Large Momentum ◽  
X Ray Diffraction ◽  
X Ray ◽  
Structure Factors ◽  
Angle Scattering

This paper summarizes the scientific trends associated with the rapid development of the technique of high-energy X-ray diffraction over the past decade pertaining to the field of liquids, glasses, and amorphous materials. The measurement of high-quality X-ray structure factors out to large momentum transfers leads to high-resolution pair distribution functions which can be directly compared to theory or combined with data from other experimental techniques. The advantages of combining highly penetrating radiation with low angle scattering are outlined together with the data analysis procedure and formalism. Also included are advances in high-energy synchrotron beamline instrumentation, sample environment equipment, and an overview of the role of simulation and modeling for interpreting data from disordered materials. Several examples of recent trends in glass and liquid research are described. Finally, directions for future research are considered within the context of past and current developments in the field.

X-Ray Anomalous Scattering Studies of Fe-Tb Amorphous Thin Films

2007 ◽  
Vol 124-126 ◽  
pp. 1653-1656
Author(s):  
Chan Wook Kim ◽  
Yasuhiro Watanabe ◽  
Susumu Nanao
Keyword(s):  
Thin Films ◽  
Structural Analysis ◽  
Amorphous Film ◽  
Near Neighbor ◽  
Distribution Functions ◽  
Anomalous Scattering ◽  
X Ray ◽  
Coordination Numbers ◽  
Amorphous Thin Films ◽  
Pair Distribution Functions

In order to investigate the atomic structure of sputtered-deposited Fe76Tb24 amorphous film, we performed X-ray anomalous scattering (XAS) measurements at two energies near the Tb K-absorption edge using the synchrotron-radiations (SR). The total, Tb and Fe environmental pair distribution functions (PDF's) of the amorphous film were obtained from the normalized scattering intensities after the corrections for the structural analysis. The coordination numbers were calculated from the area under the fitted PDF profiles multiplied by 4πr 2 and near-neighbor distances were estimated from the positions of the peaks of the fitted profiles.

Neutron and X-ray Scattering on Liquid Eutectic Ge-Te, Sn-Te and Pb-Te Alloys

1991 ◽  
Vol 46 (9) ◽  
pp. 739-745 ◽  
Author(s):  
Hartmut Neumann ◽  
Walter Hoyer ◽  
Manfred Wobst
Keyword(s):  
Short Range ◽  
Short Range Order ◽  
Nearest Neighbour ◽  
X Ray Diffraction ◽  
Partial Structure ◽  
Pair Correlations ◽  
X Ray ◽  
Coordination Numbers ◽  
X Ray Scattering ◽  
Structure Factors

AbstractFrom neutron and X-ray diffraction investigations on liquid Ge15Te85, Sn16Te84 and Pb14.5Te85.5 alloys the coordination numbers and nearest neighbour distances of these systems are obtained. The partial structure factors and partial pair correlations reveal that the short-range order of the eutectic Ge -Te melt differs from that of the eutectic Sn-Te and Pb-Te melts

Mesoscopic structure of SiC fibers by neutron and x-ray scattering

1996 ◽  
Vol 11 (5) ◽  
pp. 1169-1178 ◽  
Author(s):  
Kentaro Suzuya ◽  
Michihiro Furusaka ◽  
Noboru Watanabe ◽  
Makoto Osawa ◽  
Kiyohito Okamura ◽  
...  
Keyword(s):  
Neutron Scattering ◽  
Volume Fraction ◽  
X Rays ◽  
X Ray ◽  
Sic Fibers ◽  
X Ray Scattering ◽  
Mesoscopic Structure ◽  
Angle Scattering ◽  
Momentum Transfer Range ◽  
First Time

Mesoscopic structures of SiC fibers produced from polycarbosilane by different methods were studied by diffraction and small-angle scattering of neutrons and x-rays. Microvoids of a size of 4–10 Å in diameter have been observed for the first time by neutron scattering in a medium momentum transfer range (Q = 0.1–1.0 Å−1). The size and the volume fraction of β–SiC particles were determined for fibers prepared at different heat-treatment temperatures. The results show that wide-angle neutron scattering measurements are especially useful for the study of the mesoscopic structure of multicomponent materials.

scholarly journals X-Ray and Neutron Diffraction of Amorphous Nickel-Zirconium-Alloys as Prepared in Different Ways

1991 ◽  
Vol 46 (6) ◽  
pp. 491-498 ◽  
Author(s):  
L. Schultz ◽  
P. Lamparter ◽  
S. Steeb
Keyword(s):  
Neutron Diffraction ◽  
Short Range ◽  
Melt Spinning ◽  
Short Range Order ◽  
Pair Correlation ◽  
Zirconium Alloys ◽  
X Ray ◽  
Coordination Numbers ◽  
Structure Factors ◽  
The One

AbstractThe structure of amorphous NiχZr100-χ-alloys (Χ= 30, 31, 34, 63.7, and 65), which were produced by melt spinning (MS), mechanical alloying (MA), and sputtering (SP) was studied by X-ray- and neutron diffraction yielding structure factors, pair correlation functions, coordination numbers, atomic distances, and Warren-Cowley chemical short range order parameters. The atomic arrangement within the first coordination sphere is independent of the method of preparation while in the second and higher spheres it differs between the MS- and the MA-alloys on the one side and the SP-specimens on the other side. Thus one understands that some physical properties of the different specimens differ

Sign in / Sign up

Export Citation Format

Share Document