Forum: Forums topas RSS
refinement of partially crystallized sample
matsmcfly #1
Member since Apr 2018 · 10 posts
Group memberships: Members
Show profile · Link to this post
Subject: refinement of partially crystallized sample
Hi everyone,

I have a series of patterns that I would (ideally) like to refine to obtain a % crystallinity.  The sample in question is an amorphous phase that slowly crystallizes with time.  Is it possible, using Topas, to refein the crystaline phase and the amorphous phase (background) as a way to try and quantify the appearance of the crystalline phase?


Best,
Martin
johnsoevans (Administrator) #2
User title: John Evans
Member since Aug 2009 · 246 posts
Group memberships: Administrators, Members
Show profile · Link to this post
Yes.

If you do a google search of "amorphous content topas" it will lead you to a couple of papers by Jim Cline and Pam Whitfield.  If you search the topas tech ref or the wiki for "amorphous" you'll get the topas keywords.  There's also discussion in (e.g.) the chapter by Nikki Scarlett and Ian Madsen in the Dinnebier/Billinge book.
rowlesmr #3
Member since Oct 2011 · 245 posts
Group memberships: Members
Show profile · Link to this post
It also depends on how it crystallises. Does it slowly coalesce, or do nice fully formed crystalline peaks get bigger?

It's a little hard to define "crystalline" and "amorphous" in the first case.

Matthew
--
Matthew
matsmcfly #4
Member since Apr 2018 · 10 posts
Group memberships: Members
Show profile · Link to this post
Quote by rowlesmr:
It also depends on how it crystallises. Does it slowly coalesce, or do nice fully formed crystalline peaks get bigger?

It's a little hard to define "crystalline" and "amorphous" in the first case.

Matthew

The initial pattern is purely amorphous single phase, as time goes on the crystalline phase slowly grows in i.e. crystalline diffraction on top of the amorphous background.  The experiment is still undwerway; however, I expect that the crystalline phase will continue to grow in until roughly all the amorphous phase has crystallized resulting in 100% crystalline phase
matsmcfly #5
Member since Apr 2018 · 10 posts
Group memberships: Members
Show profile · Link to this post
In reply to post #2
Quote by johnsoevans:
Yes.

If you do a google search of "amorphous content topas" it will lead you to a couple of papers by Jim Cline and Pam Whitfield.  If you search the topas tech ref or the wiki for "amorphous" you'll get the topas keywords.  There's also discussion in (e.g.) the chapter by Nikki Scarlett and Ian Madsen in the Dinnebier/Billinge book.

Thanks for this, I will dig out these papers and try and get hold of a copy of the book you refer to
mfisch #6
Member since Sep 2011 · 113 posts · Location: University of Bern, Switzerland
Group memberships: Members
Show profile · Link to this post
https://ceramics.onlinelibrary.wiley.com/doi/abs/10.1111/j…

This might be of some help
Close Smaller – Larger + Reply to this post:
Verification code: VeriCode Please enter the word from the image into the text field below. (Type the letters only, lower case is okay.)
Smileys: :-) ;-) :-D :-p :blush: :cool: :rolleyes: :huh: :-/ <_< :-( :'( :#: :scared: 8-( :nuts: :-O
Special characters:
Go to forum
Not logged in. · Lost password · Register
This board is powered by the Unclassified NewsBoard software, 20150713-dev, © 2003-2015 by Yves Goergen
Current time: 2020-11-29, 14:41:10 (UTC +00:00)