Hi Lubo,
Yes, one way to do this is to add a known mass X of a standard (say
alumina) to a known mass Y of the glass + crystal sample, giving a
weight ratio f = X/Y of standard to sample. Then use x-ray diffraction
to get the weight ratio of the standard to only the crystalline part of
the sample. This should be a larger number, call it f'. The ratio f/f'
is then equal to the mass fraction crystal/(crystal + glass) in the
sample.
I have seen this neat trick work well for calculating the quantity of
glass in a ceramic insulator for a power line. The fraction of glass
calculated with this method was consistent with the SEM images of the
ceramic.
Hope that helps!
- Kurt
.
-----Original Message-----
From: Lubomir Smrcok [mailto:[EMAIL PROTECTED]
Sent: Saturday, February 02, 2008 4:09 AM
To: rietveld_l@ill.fr
Subject: glass & crystalline
Hello,
I was asked by my colleague if there is a way how to find (I'd prefer
estimate)
the amount of the crystalline phase in the glass "matrix". Both phases
have the
same (or very close) chemical composition.
If necessary, they can also prepare the sample totaly crystalline
without any
glass.
My apologies for sending this problem to "rietveld" list, but I hardly
know any
better address :-)
To be frank : I do not expect to solve the problem using "Rietveld" as
the
structure of the crystalline phase is not very well known. They would
prefer a
relatively simple method for daily use in their lab.
Thanks on behalf of them.
Lubo
