Hasan Muhammad Usama

4 Questions 12 Answers 0 Followers

Questions related from Hasan Muhammad Usama

Why Hall effect measurement giving wrong values?

I am trying to determine the carrier concentration and mobility of La and Zr substituted bulk BiFeO3. My specimens are in a square/rectangular shape with thickness 0.6-0.8 mm and length/width of...

08 May 2017 6,980 10 View

What could be the reason behind this discontinuity in UV-Vis spectra?

As you can see there are two clear discontinuities in the F(R) vs Energy spectra which is surely not an effect intrinsic to the sample. Spectra was obtained in Diffuse reflectance mode using a...

10 December 2016 7,179 3 View

What could be the reason for observing negative dielectric constant near 10^5 to 10^6 Hz in La-substituted (20%) Bismuth Ferrite?

Dielectric constant was measured in sintered pellets of the compound with silver paste as electrodes using a Wayne-Kerr impedance analyzer. Note that the tan d peaks correspond to the points where...

31 July 2016 3,167 3 View

Intensity mismatch in Rietveld refinement of BiFeO3 based compounds using FullProf. How can I improve the fit?

I am just starting out with rietveld refinement. I have been trying to get a good fit for my data of the compounds Bi0.8La0.2Fe(1-x)Zrx using the software Fullprof. But in all my 4 compositions...

27 July 2016 8,024 4 View