Shaopeng Zhang

6 Questions 9 Answers 0 Followers

Questions related from Shaopeng Zhang

Can micro-stress result in different contrasts under TEM?

If different parts of the TEM sample have different microscopic stress states, is there any possibility that the micro-stresses result in different contrast under TEM? Are there some useful...

12 December 2013 7,108 6 View

Do I need to remove the ka2 of Cu-XRD data before Rietveld refinement using GSAS?

I am working on Cu-XRD data. I have noticed that the wavelength of ka1 and ka2 and their ratio are required when editing the instrument parameter file. Does this mean that the contribution of ka2...

10 October 2013 6,482 17 View

Can someone advise on a problem when using GSAS?

Now I am learning GSAS (GENERAL STRUCTURE ANALYSIS SYSTEM). But I feel confusing about the setup of space group R3m. To my limited knowledge, R3m can be written in GSAS as "R 3 m R" or "R 3 m"....

07 July 2013 6,552 4 View

GSAS: the meaning of some parameters

Now I am reading a brochure "EXPGUI and GSAS Rietveld software practicals", written by Lachaln Cranswick and Ian Swainson. There are some parameters in the software GSAS and this brochure that I...

06 June 2013 9,993 3 View

How to decide/calculate the Raman modes of perovskite structure (ABO3)? Do BTO with different crystal structures have the same number of Raman modes?

The phase transition behavior of ferroelectrics with perovskite structure (ABO3) has been widely studied using Raman spectropy, especially for the ceramics with nano-grains. Take the most famous...

06 June 2013 8,682 3 View

Application of Scherrer's equation?

In XRD analysis of powders, Scherrer's equation can be used to determine the crystalline size of the powders, by measuring the half width of the XRD peaks. And this equation is effective when the...

05 May 2013 8,270 11 View