André Luiz Menezes de Oliveira

5 Questions 33 Answers 0 Followers

Questions related from André Luiz Menezes de Oliveira

Could I mesure the oxygen vacancy by Rietveld refinement?

How could I predict the number of oxygen vacancy in a material by Rietveld refinement?

04 April 2013 1,570 3 View

Can anyone suggest the most accurate method for calculating the band gap values of powders and thin films materials?

I am in doubt about which method i may use to calculate band gap of thin films, if the Kubelka-Munk method using diffuse reflectance spectra or the Tauc method using absorption spectra.

10 October 2012 5,463 96 View

Does anybody know any characterization techniques to predict the surface area of thin films?

What is the principle of this analysis?

10 October 2012 3,378 4 View

What is the best method to predict the defects on a thin films surface?

Is it possible to quantify these defects?

10 October 2012 6,590 3 View

How can I get a nice vibrational-mode signal in the Raman spectra of a thin film?

I have prepared thin films with thickness around 300nm, but I got a low signal of the vibrational mode of my materials. Does anybody know if it is because of the thickness of my thin films or...

10 October 2012 5,419 27 View