Evolution of the resolution versus diameter

to know if some one have done such test, what can we obtained in term of increase of the resolution, lost in counting, decrease of asymmetry at low angle…. François Dr. François Goutenoire Maître de Conférences Assistant Professor Laboratoire des Oxydes et des Fluorures Av. Olivier Messiaen

Standard in transmission geometry

Dear Rietveld Users, I would like to find a standard in transmission geometry in order to test the resolution of our futur laboratory diffractometer. I would like to find a simple coumpound with a relative low absorption from 10 to 20 cm-1 with copper radiation. I have asked the same

Toshiba distributor

Dear Rietveld users, I am looking for a distributor of Toshiba X-ray tube for a Miniflex (Rigaku) system in France or in Europe The model is A20, 21 or 41 Thanks in advance -- * Pr. Francois

Bond valence calculation of mixed site

Dear Rietveld users, I am currently using Bond_str from the fullprof suite to calculate the valence of my different atoms. I would like to calculate the bond valence in the case of mixed sites with different oxidation state. Does anyone have found a solution to do this calculation of the

Tricks for transmission sample preparation between foils

Dear Rietveld users, We are currently using transmission flat sample on our diffractometer. To prepare the transmission flat sample we are using mylar 15microns or kapton. We put the sample between 2 mylar foils. I would like to know if there is some tricks in order to nicely put the powder

Re: Tricks for transmission sample preparation between foils

Thank every one for the propositions. Find here after the result of a test (vaseline + n-heptane) http://perso.univ-lemans.fr/~fgouten/Transmission_Tricks Best Regards, François Le 08/02/2017 13:35, François Goutenoire a écrit : Dear Rietveld users, We are currently using transmission flat

Strength of spherical harmonic preferential orientation correction

currently working with two compounds which present high preferential orientation K2SO4 and NaHCO3 on different diffractometer setting and sample preparation: reflection/transmission, back loading preparation, spread on grease, capillary ….. If any one can help me ? Thank in advance. François

heater system in transmission

Dear Rietveld users, We would like to buy or to built an heater system for our laboratory system (Empyrean equipped in transmission with capillary). The aim is to reach 200-300°C, this is mainly for organic compounds. I have few questions : if we use an air blower is there any problem for the

Asymmetry peak shape difference between (pellet/powder)

://perso.univ-lemans.fr/~fgouten/Asymmetry Best Whishes, François Goutenoire -- * Pr. Francois GOUTENOIRE e-mail:francois.gouteno...@univ-lemans.fr Tel: 02.43.83.33.54 FAX: 02.43.83.35.06 Département des Oxydes et

Re: Asymmetry peak shape difference between (pellet/powder)

gt;: Hello, In the photo, the pellet is black and the powder is white. Why is that? Best Jon On December 8, 2017 3:35:20 PM GMT+01:00, "François Goutenoire" <francois.gouteno...@univ-lemans.fr <mailto:francois.gouteno...@uni

Mixed refinement Topas example

Dear Rietveld users, I am starting with Topas5.0 commercial, and I would like to do a mixed X-Ray-Neutron refinement directly on GUI mode. Does anyone can send me an example of *.PRO file or even an *.INP file to to the refinement in launch mode. The neutron data are with constant

Occupancy factors for mixed site in TOPAS

Dear Rietveld users, One more question ! I am unable to find the way to constraint occupancy factor for mixed sites in Topas in GUI mode. Sorry for this basic question, but I did not find any examples in Archives Mailing List / Topas Wiki / or even in the Topas examples Best whishes,

Re: Occupancy factors for mixed site in TOPAS

Thanks to every one. It was not so difficult in fact . Best whishes, François Le 19/02/2019 à 11:02, François Goutenoire a écrit : Dear Rietveld users, One more question ! I am unable to find the way to constraint occupancy factor for mixed sites in Topas in GUI mode. Sorry for this basic

Fullprof multi pattern (TOF + RX)

Dear Rietveld users, One more question ! Does any one has performed a mixed (TOF+RX) refinement with Fullprof ? I would like to have an *.pcr file for model. Best Whishes, Francois -- * Pr. Francois

Bond Valence Restraints in Topas

://perso.univ-lemans.fr/~fgouten/Topas If some one have used such restraint ? Best whishes François Goutenoire -- * Pr. Francois GOUTENOIRE e-mail: francois.gouteno...@univ-lemans.fr Tel: 02.43.83.33.54 FAX

Re: Bond Valence Restraints in Topas

-Vi, %dev=100abs(r1)/Vi} Deviation from the Equal Valence Rule (r2): 0.332 {r2=>rms} I need now to see the penalties !! need also some help ! Best whishes, François Le 07/03/2019 à 16:03, François Goutenoire a écrit : Dear Rietveld users, especially Topas users, I am now exploring the TOPA

Jana2006 example TOF_HRPD_ISIS

, François Goutenoire -- * Pr. Francois GOUTENOIRE e-mail: francois.gouteno...@univ-lemans.fr Tel: 02.43.83.33.54 FAX: 02.43.83.35.06 Skype Entreprise visio conférence Département des Oxydes et Fluorures Institut

Helping system for heavy load

Hello everyone, Far away from the pure Rietveld question... We have a beautiful XRK900 (furnace) system associated with our latest powder diffractometer. However, the temperature chamber associated with Z-Stage is relatively heavy (15-20Kg ?) and the tie is on the back panel and the arm

Hyper-Lorentzian effect on quantitative analysis

Dear Rietveld users, I have some industrial compound presenting a strong hyper-Lorentzian peak shape (eta=1.1 with HighScore). When we calculate the amorphous content after an internal standard addition, the result is 40%. The micro-absorption effect has been minimized (mu of the internal

Re: Hyper-Lorentzian effect on quantitative analysis

 Dear Rietveld users, Thank you very much for all your responses, it will help us move forward on the subject. Unfortunately, I cannot say more because of an NDA. But it still looks very interesting from a fundamental point of view. Best whishes, françois Goutenoire Le 03/03/2021 à 18:47