[GSAS-II] Over estimation of crystallite size

[Victor Zenou]

Dear everyone.
I used GSAS-II to estimate crystallite size from lab PXRD. The sample was
annealed anatase.
Before annealing all results (GSAS-II, Debye function analysis (DFA), GSAS
and HRTEM) were the same, about 5nm.
After annealing GSAS-II gave 19/21(0.3) nm, while DFA gave 14(5) nm and
HRTEM gave 12(3).
Does anyone got the same , what seem to be, over estimation by GSAS-II?
Of course, using standard deviation give not so far results.
Best regards,Victor

בתאריך יום ה׳, 23 באוג׳ 2018, 20:00, מאת ‏<gsas-ii-request at aps.anl.gov>:

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>    1. Help with refining instrumental parameters (Emily Siska)
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> Message: 1
> Date: Wed, 22 Aug 2018 10:58:38 -0700
> From: Emily Siska <siskae at unlv.nevada.edu>
> To: gsas-ii at aps.anl.gov
> Subject: [GSAS-II] Help with refining instrumental parameters
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>  In GSAS I when there was more than one phase you could refine GU GV, GW
> and LX, LY for each
> phase separately. Is that possible in GSAS II? If so how?
>
> Sorry if you have received this message multiple times - I have been having
> trouble with the server.
>
>
> Thank you for your help!
>
>     Best Regards,
>     Emily Siska
>
>
> --
> Emily Siska
>
> Chemistry Graduate Assistant
> Chemistry/HiPSEC
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> Science and Engineering Building, Room 2173
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> Message: 2
> Date: Wed, 22 Aug 2018 11:16:49 -0700
> From: Sergey Ushakov <svushakov at ucdavis.edu>
> To: gsas-ii at aps.anl.gov
> Subject: Re: [GSAS-II] Help with refining instrumental parameters
> Message-ID:
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> In GSAS-2 you refine size and strain for each phase instead. It makes sense
> since instrument parameters do not vary with phase!
>
> On Wed, Aug 22, 2018 at 10:58 AM, Emily Siska <siskae at unlv.nevada.edu>
> wrote:
>
> > In GSAS I when there was more than one phase you could refine GU GV, GW
> > and LX, LY for each
> > phase separately. Is that possible in GSAS II? If so how?
> >
> > Sorry if you have received this message multiple times - I have been
> > having trouble with the server.
> >
> >
> > Thank you for your help!
> >
> >     Best Regards,
> >     Emily Siska
> >
> >
> > --
> > Emily Siska
> >
> > Chemistry Graduate Assistant
> > Chemistry/HiPSEC
> >
> > Science and Engineering Building, Room 2173
> > University of Nevada, Las Vegas
> > 4505 S. Maryland Pkwy.
> > Las Vegas, NV 89154-4003
> > Office: (702) 894-1478
> > Cell: (818) 642-7718
> >
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>
> --
> --
> Sergey Ushakov PhD
>
> Staff Research Associate
>
> Peter A Rock Thermochemistry Laboratory and NEAT ORU
> Rm 4415, Chemistry Annex
> University of California, Davis
> Davis, CA 95616
> phone (530) 902-8185
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