Register to reply

XRD data: particle size, cell size etc

by Oxygenne
Tags: cell, data, particle, size
Share this thread:
Oxygenne
#1
Jun26-09, 05:38 AM
P: 55
I use to do XRD from room temperature to High temperature and then cooling again at room temperature.
I see there is constant going to the right for all the peaks and also their intensities are decreasing, also the width of peaks is becoming larger.
I would like to interpret those data and also to calculate the particle size and the unit cell size (if there is a change with the temperature).
It seems the phase is not change only the garbages and the intensities values.
Could you help me to interpret those data or to guide to read something on the web to help me with this?
Thank you!
Phys.Org News Partner Physics news on Phys.org
A new, tunable device for spintronics
Researchers study gallium to design adjustable electronic components
Gadolinium-based material that can be cooled by varying magnetic field
drizzle
#2
Jun29-09, 02:47 PM
PF Gold
drizzle's Avatar
P: 526
I thought your post were in this thread;

http://www.physicsforums.com/showthr...=122682&page=2

I answered it in post 31, looks like I hit two birds with one stone
Oxygenne
#3
Jun30-09, 04:32 PM
P: 55
Thank you drizzle!
On an Intensity vs. 2*theta plot of a powdered, crystalline sample how to calculate the miller indices?

drizzle
#4
Jul1-09, 10:11 AM
PF Gold
drizzle's Avatar
P: 526
XRD data: particle size, cell size etc

I think to determine the miller indices of each peak [the surface where the diffraction occur] you would need to use GPDS cards or a handbook [its a catalogue that holds the analyzed XRD data of almost all structures and compounds, will maybe not all, it depends on the book]. it goes like this; in your XRD pattern you would see several peaks, each at a precise angle. say that your XRD pattern is of the material ZnO and the first peak is at 35 degrees, you then should look for ZnO in that data and find the matched angle thus the corresponding surface, you would find tables of different data, i.e.

XRD pattern for ZnO:

(hkl) 2θ relative intensity
100 35 87.5
102 47 63
etc

also it could be calculated.
Oxygenne
#5
Jul1-09, 12:39 PM
P: 55
I would like to calculate taking in account the data I have (Intensity vs. 2*theta plot)

I found a formula but there is included the unit cells parameters and I do not want to use that, because my goal is to find the unit cell parameter using the recorded data for each set of data.

* How to interpret the constant moving of my intensities to the right with each temperature step?

*How to interpret the constant decreasing in intensity of every peak with each temperature step?

Thank you!


Register to reply

Related Discussions
Comparing data sets of different size Astronomy & Astrophysics 4
Particle Size VS Atom Size General Physics 5
How to find particle size from XRD data using DS formula Atomic, Solid State, Comp. Physics 0
Cell size is proportional to ploidy Biology 14