Apu,
I would try bimodal distribution of crystallite sizes: in fullprof you can use
two phases with the same structure and different peak shape and broadening.
Regards,
Patrick
Patrick Weisbecker
You should make a first refinement with ATZ=0 for both phases, and let the
value that the software has calculated.
Be carefull, the first atom site must be fully occupied.
Patrick
De : Kotaro SAITO
À : Rietveld_l@ill.fr
Envoyé le : Mardi 24 février 2015 11h52
Objet : Quantitative phase
Most graphene samples have got few layers thus you can see some broad and weak
00l peaks.However the main part of the diagram is made of asymetric hk bands
(10 11), no hkl reflexions with l non 0 (Have a look at the old papers of
Warren and Franklin):
Patrick Weisbecker
De : Nelson
Dear Teresa,
You could use Carine Cristallography, it provides miller indices of a direction
by clicking on atoms.
http://pagespro-orange.fr/carine.crystallography/
Regards
Patrick Weisbecker
LCTS-PESSAC
France
De : Habib Boughzala
À : rietveld_l@ill.fr
Hi Alex,
May be we worked with the same furnace: Inel? I had also the same problem and
solved it by making a new sample holder with a smaller thermocouple placed on
the side of the sample holder.
Patrick
Patrick Weisbecker
LCTS - Pessac
- Message d'origine
De : &qu
Hi,
One way to get rid of the temperature uncertainty is to introduce a second
thermocouple inside the furnace and to fix it as close as possible from the
sample. If the sample is a bulk sample:Drill a hole inside the sample and put
the thermocouple inside the hole and if the the sample is made
It is indeed advisable to start with an internal standard to check that there
is no instrumental error or sample position issue (sample displacement is the
more common cause of peak shift).
Silicon powder is often used as a standard, a standard reference material (SRM)
is sold by the NIST (SRM64
his problem? Thanks in advance.
>
>Arie van der Lee
>
--------
Patrick Weisbecker
Service commun diffraction X
LSG2M
Ecole des Mines de Nancy
Parc de saurupt
5
://www.hotmail.com.
>
>Share information about yourself, create your own public profile at
>http://profiles.msn.com.
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>
------------
Patrick Weisb
trick.
Patrick Weisbecker
LSG2M
Ecole des Mines de Nancy
Parc de saurupt
54042 Nancy
email: [EMAIL PROTECTED]
Hello,
I'm looking for a standard material to use as an internal strandard
(lattice parameter) for High Temperature X-ray diffraction ( range 300-1400K).
I already use silicon, however it can react with other phases.
Do you have any suggestions?
Patrick.
Hello,
I don't remember which one is the yag but it must be under (check this
values, some are refined):
!---
! Data for PHASE number: 2 ==> Current R_Bragg: 3.72
!--
Hello,
Informations from the Pearson's handbook:
Fe7Pr R-3m a=8.582 c=12.462
Fe1 6c0 00.103occ 0.66
Fe2 9d0.5 00.5 occ 1.0
Fe3 18f 0.297 00occ 1.0
Fe4 18f 0.164 0.8360.494occ 1.0
Hi Hugues,
I'm not a specialist in this field but I know that WinFit (Stefan Krum,
institut fur Geologie) is well suited for size and strain determination;
you can download it at :
http://www.geol.uni-erlangen.de/html/software/winsoft.html
I can advise you an article :
Voigt-Function Modeling
Hello,
Does someone has got accurate measurement of lattice parameter of Si in the
range 290°K-1300°K?
Thanks by advance.
Hi Brian,
In fact my problem came from a default parameter in LAZY but not from
thermal term (i had checked it was at 0),it was the correction for
anomalous dispersion which was made by LAZY.
Patrick Weisbecker.
At 10:26 05/03/99 -0500, you wrote:
>Hi Pat,
>
>Not everything r
come from? Which software is the more
reliable?
Patrick Weisbecker
Laboratoire de Science et Genie des Materiaux metalliques
Ecole des Mines de Nancy
e-mail: [EMAIL PROTECTED]
Hello,
About influence of misalignement on peak assymetry; A good mean to improve
symetry of peaks at low angles is to use soller slits, indeed other
parameters than alignement can be responsible for asymetry.
As for modeling peak shape, I use Fullprof and i also have difficulties to
find a good
refine U and Y, if it doesn't work try several values of Y and refine U.
Moreover check that you don't have anisotropic broadening.
Best regards,
Patrick WEISBECKER.
Laboratoire de Science et Genie des Materiaux metalliques.
Ecole des Mines de Nancy
>
> Dear Edouard,
>
>
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