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Rameshwari Naorem1 Anshul Gupta2 Sukriti Mantri3 Gurjyot Sethi4 K.V. Mani Krishna5 Raj Pala6 Kantesh Balani2 Anandh Subramaniam2

1, Indian Institute of Technology (IIT) Kanpur, Kanpur, , India
2, Indian Institute of Technology Kanpur, Kanpur, , India
3, University of New South Wales, Sydney, New South Wales, Australia
4, Carnegie Mellon University, Pittsburgh, Pennsylvania, United States
5, Materials Science Division, Bhabha Atomic Research Center (BARC), Mumbai, , India
6, Indian Institute of Technology Kanpur, Kanpur, , India

In concentrated disordered solid solutions, the disorder permeates the whole solid and hence cannot be viewed akin to a defect in a perfect crystal. To comprehend the effect of atomic disorder in concentrated alloys on the Bragg peaks of powder XRD patterns, model binary and multicomponent alloys have been used for both computational and experimental studies. The effect of various a priori distortion parameters like 'δ', △Rmax and u on the Bragg peaks is studied. Intensity and FWHM of the Bragg peaks are monitored across alloys to isolate the effects of atomic disorder. Using the results, discrimination is made between true bond distortion and other measures of lattice distortion. This is further used to understand the non-linear variation in the intensity of the Bragg peaks with lattice distortion. The shortcomings of modeling atomic disorder as a thermal effect are pointed out in light of the investigations.

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