Ahmed Saeed Hassanien

14 Questions 253 Answers 0 Followers

Questions related from Ahmed Saeed Hassanien

Dear my colleagues , how can anyone calculate the elastic moduli of a cubic crystal structure from x-ray diffraction ??

I want to calculate internal residual stresses due to the annealing process, so Young modulus must be known. Therefore, it should be calculated. What are the equations that can be used to...

03 March 2017 3,871 16 View

Is there any free software available to calculate the optical constants?

Is there any free software available to calculate the optical constants using the optical measurements of the reflectance and transmittance together? or by using the optical absorbance alone?I had...

18 December 2016 6,739 6 View

Please, Can any one inform me if XRD can detect the different types of the crystalline imperfections ? What are the used software programs?

Please, Can any one inform me if XRD can detect the different types of the crystalline imperfections ? What are the used software programs? are there free programs can determine these defects? If...

02 May 2016 4,977 3 View

Please, How can I differentiate between the different phases of non crystalline iron (III) oxides?

اPlease, How can I differentiate between the different amorphous phases of the iron (III) oxides? what is the simplest and suitable way that can differentiate between: Alpha-Fe2O3 , Beta-Fe2O3 ...

22 February 2016 6,884 7 View

Please, Can anyone provide me a new article (2012-2016) devoted to study the relation between the band gap energy and the electronic polarizability?

Please, Can anyone provide me an article study the correlation between the band gap energy and the electronic polarizability in semiconducting chalcogenide materials?

14 February 2016 7,177 5 View

Is Vegard's law valid to calculate the optical energy gap of glassy chalcogenide (II-VI) alloys?

Vegard predicted to calculate theoretically the optical energy gap of crystalline systems for the III-V systems. Does this law valid to calculate the optical energy gap of glassy chalcogenides...

27 August 2015 3,047 3 View

Does anyone measure the dielectric relaxation time of Amorphous chalcogenide materials?

What are the most appropriate way for measuring this time? What are the limits of its value?

06 April 2015 2,005 2 View

What are the advantages and disadvantages of using X-ray diffraction line profile analysis XRDLPA?

What are the more accurate methods to calculate crystallite size, types of dislocations and microstrain of nanostructure materials?

10 March 2015 1,282 2 View

Why does the resistivity of an alloy need to be between those of its components, or at least similar to them?

The resistivity of an alloy should be between those of its components, or at least similar to them. But practically, it was found that, it was much higher than that of either component.

02 March 2015 794 9 View

Why is the resistance of an disordered alloy so high?

the resistance of an disordered alloy is found so high and larger than the crystalline alloy of the same composition. What is the interpretation of this behaviour?

02 March 2015 7,087 7 View

What is the relation between skin depth and optical properties of semiconducting materials?

What is the skin effect and what is it meaning for semiconducting materials?

31 January 2015 1,962 8 View

What is the interpretation of an existence of three electronic transitions in semiconducting nano-sized thin films?

Please, can anyone explain the physical meaning of existing three electron transitions?

13 January 2015 1,361 2 View

Does anyone have an accurate theoretical method to calculate the elastic modulus for any chalcogenide alloy?

Does anyone have an accurate theoretical method to calculate the elastic module for any chalcogenide alloy?

05 January 2015 5,174 2 View

Please, how can I calculate the refractive index of a sample from the transmission (T) measurements ?

From this relation could you determine the refractive index (n) T = 4n / (n+1)2

19 December 2014 1,348 4 View