| Study of Short-range Ordering in Amorphous and
Nanocrystalline Materials from Laboratory based Pair
Distribution Function (LPDF) |
Ripan K. Biswas, Jiten Ghosh* and Muraleedharan Kuttanellore
Pages : 158-165
DOI : 10.1080/0371750X.2020.1787866 |
| Abstract |
| Determination of local atomic structure at nanoscale for both amorphous and
nanocrystalline materials is very difficult and challenging. Local arrangement
of atoms needs to be studied for understanding the local or short-range
structural information. Pair distribution function (PDF) analysis is a technique
used to study the short-range structure of the materials based on local
atomic arrangement of atoms using synchrotron and neutron sources. But
there is a demand for routine analysis based on laboratory X-ray diffractometer
(XRD) using Ag radiation (?=0.5608 Å) with maximum achievable Q value of
22 Å–1. An attempt has been taken to study the short-range structure in
crystalline Ni, silica glass (SiO2) and nano silica using total scattering
experiment to show the capabilities and usefulness of PDF technique in
laboratory XRD and are compared with the data from synchrotron radiation
to achieve good quality scattering data and optimizing technical feasibility
of the optics. PDF results of Ni showed the goodness of optical alignment.
The first Si-O distance for both silica samples signified that they hold shortrange
order within the tetrahedral unit while differences are observed at
higher radial distances. Laboratory based PDF experiment helped to get
local/short-range structural information for better understanding the
multifunctional properties of nano and disordered materials.
[Keywords: Pair distribution function, PDF, Total scattering, Glass silica,
Nanomaterials, Laboratory XRD] |
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