Jamal Nasir

7 Questions 19 Answers 0 Followers

Questions related from Jamal Nasir

How does mixed covalency and ionicity affect crystal structures?

I’d appreciate ‘only’ the experts to answer. I’m facing not only a literature full of discrepancies, and dealing with those discrepancies, in the quantitative characterization ‘covalency and...

09 February 2025 1,406 5 View

Can XRD CS be bigger than TEM particle diameter?

Hi XRD and TEM experts It doesn't make sense to me but I still wanted to see if it's possible to have XRD crystallite size bigger than TEM particle diameter. I'm talking about high BET oxide...

01 November 2023 1,817 4 View

What is the effect on 1H MAS NMR of proton exchange with humidity at a metal oxide surface?

Hi solid-state NMR experts, What happens to the 1H resonances when a proton exchange starts to take place at the surface of metal oxides? Let's say we have multiple highly resolved 1H resonances...

19 September 2023 8,970 2 View

Is it common to directly observe surface amorphous layer in TEM/SEM?

Hi everyone, Some crystalline solids are covered by an amorphous layer at the surface. Are these amorphous/disordered surfaces usually directly observed by microscopic techniques? If yes, could...

25 August 2023 6,438 3 View

How reliable is TEM for the characterization of antiphase boundary (APB) defects in metal oxides?

The existence of anti-phase domain boundaries (APBs) in polycrystalline materials is usually established by electron microscopic techniques (SEM/TEM) [1] and is also discussed in diffraction data...

13 March 2023 9,365 8 View

How to get correct crystallite size and strain for disordered materials in Topas?

Hi everyone, I have a problem with crystallite size in Topas refinement. I'm using the LVol_FWHM_CS_G_L macro and the problem I'm constantly facing is that the Gaussian contribution goes to a...

24 February 2023 4,439 7 View

The existence of anti-phase boundaries (APBs) in defective crystalline materials

The existence of anti-phase domain boundaries (APBs) in polycrystalline materials is usually established by electron microscopic techniques (SEM/TEM) [1] and is also discussed in diffraction data...

01 January 1970 6,279 0 View