Abdullah Riaz

6 Questions 10 Answers 0 Followers

Questions related from Abdullah Riaz

Why elastic modulus decrease with increase in force/depth of nanoindentation?

With different forces/depth of nanoindentation, hardness and modulus of elasticity decreases. The question is that how we can be sure that which values of hardness or elasticity of modulus are...

06 June 2018 282 4 View

Why scan during XRD measurement?

What will be difference if one could do XRD of a spot and also with scan of polycrystalline material? Why do we scan during XRD?

11 November 2017 9,259 0 View

What is the difference between particle size and grain size?

SEM can be used to estimate the particle sizes of powder but If the powder is sintered then from SEM images of bulk sample, they are not said to be particle size anymore but grain size? Am I...

08 August 2017 6,735 6 View

I am trying to do Rietveld refinement using MAUD for X Ray data, can anyone help me out to fit the Fe80Ni20 nanopowder (after 5 minutes ball milling)?

I have already calibrated the diffraction instrument so I fixed the diffraction instrument and added two phases (Fe and Ni) and refined their volume fractions, cell lengths and isotropic (crystal...

03 March 2016 6,146 9 View

How to determine the crystallinity % using MAUD for rietveld refinement of FeNiTaB powders with different milling times?

I have both crystalline and amorphous phases. I want to know how can I determine the crystallinity % and how to determine amorphous phases without using internal standard because I did not add...

01 January 1970 5,394 2 View

Why some Provskite structure ceramics are not piezoelectric?

Piezoelectric effect is caused by non-symmetrical charge in lattice but why some ceramics are piezoelectric but some are not?

01 January 1970 5,440 5 View