Good evening, I have a question about Miller indexes (h k l) in the space group R-3c (n° 167): in the article Chem. Mater. 2003, 15, 2084-2093 the authors...
Marco Sommariva
marco.sommariva@...
Feb 2, 2005 5:22 pm
1475
Dear colleagues I would like to call your attention to the powder diffraction capabilities at the Lujan Center for neutron scattering at Los Alamos National...
Anna Llobet
allobet@...
Feb 2, 2005 5:29 pm
1476
The conditions limiting the possible reflections for the space group R-3c are, for the class h0l, 2h+l=6n so the reflection 303 is clearly forbidden, in that...
ferdinando costantino
fcost77@...
Feb 3, 2005 9:22 am
1477
Thanks for your fast answer, but I don't see in R-3c the condition you write about: I see only h -h 0 l, that is equivalent in ordinary Miller indexes to h -h...
Marco Sommariva
marco.sommariva@...
Feb 3, 2005 9:43 am
1479
Dear Crystallographers, does anybody know if the ratio between k-alpha1 and k-alpha2 can change during the life of a conventional Cu-X-ray tube ? Thanks to...
Marco Sommariva
marco.sommariva@...
Feb 4, 2005 4:21 pm
1480
... The ratio between K-alpha1 and K-alpha2 is due to the relative population between the energy levels in your Cu atoms. The Kalpha fluorescence is due to ...
Vincent Favre-Nicolin
vincefn@...
Feb 4, 2005 7:06 pm
1481
Hi, There was a case for which we found alpha1/alpha2 ratio is changing. That was with a Siemens D5000 equipped with a Goble mirror. Due to aging, tube's ...
DEAR ALL I have made thin films of AN AMORPHOUS ALLOY and unfortunately the phases that i found are VERY MUCH different from the bulk and i am not able to...
Dear Hysen my name is Dr. Karel Saksl I working at HASYLAB/DESY german synchrotron source. My research concerns amorphous materiels. Now, concerning your...
Thanks a lot for your answer Marco ... From: Vincent Favre-Nicolin <vincefn@...> To: <sdpd@yahoogroups.com> Sent: Friday, February 04, 2005...
Marco Sommariva
marco.sommariva@...
Feb 7, 2005 12:10 pm
1486
I have identified one phase . but the other phase is of a lower angle (2theetta) one and the corresponding d value was not found in any jcpds data available...
Hysen Thomas
hysenthomas@...
Feb 7, 2005 7:03 pm
1487
Dear all, I'm working with ab initio structure determination, my question is: Is advisable to fit the diffraction pattern before indexing to achieve more...
JMGALIAN.teleline.es
jmgalian@...
Feb 8, 2005 10:48 pm
1488
... This may depend on the FWHM and step and statistics. With high resolution instruments and 4 to 6 steps above the FWHM (0.04 to 0.06 °2-theta for ~1.5 A ...
Dear all, Up to now, in most of my refinements i just get negative thermal parameters in most of the atoms in each structure, and i can not get rid of it...
Gerard, Garcia S
gsg2@...
Feb 9, 2005 5:51 pm
1490
Dear All and Dear Gerard, I have a very little experience on Rietveld refinement, but my professor always says to me that a negative value of isotropic factor...
Marco Sommariva
marco.sommariva@...
Feb 9, 2005 6:07 pm
1491
Gerard, Just read this communication: V. Sidey, J. Appl. Cryst. (2004), 37, 1013-1014. If your intensities at low angles are biased, i.e. lower than expected,...
Thierry Bataille
thierry.bataille@...
Feb 10, 2005 4:38 pm
1492
We invite you to contribute to the special session at SMEC 2005: "Materials and temperature" Where/When: CESMEC Conference 2005 April 17-21, 2005 Miami,...
Hi everybody, I'm working in the structure determination into of the hydroxyapatite (Ca10(OH)2(PO4)6) synthesized by hydrothermal reaction. Please, could ...
Dear All, Iam an working on the percentage of crystallinity calculation using the powder XRD pattern. Could any one can give me some documentation or the...
bixam manthri
mantri_21@...
Feb 16, 2005 6:16 am
1496
Hi, There are 78 entries in the Crystallography Open Database (COD) obtained by a search with the keyword 'apatite', and 18 entyries with 'hydroxyapatite' : ...
Sent on behalf of my ex-PhD student who has not access to groups : ================================================== My name is Ondrej Pritula and I have...
Lubomir Smrcok
uachsmrk@...
Feb 16, 2005 8:17 am
1498
Hi Manthri, I have the same query as your once. I manage to find an article from the SDPD archieve entitled 'Quantitative Analysis of Amount of Amorphous ...
... If you do not have access to the Web of Knowledge nor direct access to other commercial systems, then try the new Scholar Google search engine : 135...
Dear Sir, Thanks for your reply, Is there any method for the same without using any Internal reference standerd. Without establishing a calibration curve can...
bixam manthri
mantri_21@...
Feb 17, 2005 8:11 am
1501
... I would certainly not accept it without a clear demonstration of its validity. Well, a way to confirm the validity of the method would be to make a series...
If you need to do the analysis without internal standard and no calibration curve you may look at: http://www.ing.unitn.it/~luttero/Publications/EPDIC_V/ ...
The separation of x-ray scatteering patterns in to crystalline and amorphous components to calculate a fraction of crystallinity is a widespread practise in...
dear; I have an organic powder, I want refine this powder dy Rietveld methode, how time I must put for this analysis. you must known the cristallographic...
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