Xu Mingquan

11 Questions 21 Answers 0 Followers

Questions related from Xu Mingquan

What does the ‘N’ mean ?

Hi, all, What does the 'N' mean, seeing the snapshot? The 'N" parameter in Diffraction Data in Crystal Diffract software.

29 August 2022 5,770 1 View

The details for “tomographic projection requirement” in electron tomography?

What is The tomographic projection requirement? When I read some articles about ET (electron tomography), I was told that "a monotonic measurement of some property of the sampled volume in every...

20 November 2019 7,959 1 View

The asymmetry characteristic of CFEG sources?

For the cold field-emission electron gun, the energy distribution of the primary beam captured in an EELS CCD presents an asymmetry characteristic. What causes this and are there any references?

23 September 2019 8,771 4 View

How to distinguish the double diffraction and superlattice reflection from a SAED pattern?

Hi, researchers, I am studying a complicated structure and its electron diffraction has some confusing features. There are often weak spots emerging in the SAED patterns and some articles think it...

28 April 2018 4,512 7 View

How define the convergence semi-angle on the condition of over-focus?

Hi, researchers, I confronted some difficulty in understanding the convergence semi-angle on the condition of over-focus. The convergence angle in the condition of focus like that Fig.1 shows....

30 October 2017 5,253 2 View

Higher Rwp but lower Chi2 in FullProf?

Hi, researchers, recently I refined a structure using FullProf, the result seems weird. The Chi2 is much close to 1, namely 1.33, while the Rwp is still high as 14.6, as the attached Fig1....

04 September 2017 8,676 12 View

What is the difference between incident angle and convergence angle?

Hi, researchers, In the book about TEM, it is mentioned there are two kinds of angle, the incident angle and the convergence angle. the former is that between the normal of a specimen plane and...

01 August 2017 8,439 8 View

How can I get the structure factor expression ?

Hi, Researchers, Recently, I am learning a tutorial of the Rietveld refinement online. It says that the structure factor of P42/mnm TiO2 can be expressed as the plot1 shows, the A factor. I want...

30 May 2017 3,535 7 View

How to improve my refinement results ( FullProf ) ?

Hi, researchers. Recently, I refine the Li-rich layered structure via FullProf, but the intensity of the frist peak of the pattern can not be refined well, as the Fig. I attached. the procedure of...

13 April 2017 9,386 4 View

The difference between 3a site and 3b site in R-3m space group ?

For layered cathodes in Li-ion batteries, such as LiCoO2, it is considered that they have the structure of R-3m space group. In some articles, it is represented that Li ions occupy at 3a sites and...

27 January 2017 7,933 7 View

Does anyone have any references about thermogravimetric/differential thermal analysis of Pluronic 123 (P123, M = 5800)?

I want know about the TG/DSC results of P123 in inert atmosphere. Are there any references?

25 June 2014 9,788 2 View