Hi Shay, I echo some of the other comments. A few other things: Learn how alignment will be performed (e.g., is it a black-box arrangement?) and how well you can produce close to 0.000 zero error. Is an independent water chiller required? How expensive and available are replacement X-ray tubes?
It is also important that you obtain data for samples representative of the things you anticipate examining. For example, if you will run many Fe-bearing samples, make sure to include one in your test suite (to evaluate fluorescence). I suggest that you obtain data for materials with low-angle peaks, to evaluate the performance. Many of the newer instruments have poor (my assessment) performance at low angles, below perhaps 12 degrees 2-theta in many cases, and analysis of things like clay minerals is significantly impacted. I assume any manufacturer will provide data for the NIST LaB6, to allow you to assess instrument resolution and profile shapes. You might consider obtaining data on a very small sample, e.g., a few mg or smaller, and data obtained very quickly, e.g., < 1 minute for a reasonable scan range. For all of these, make sure you receive the full run conditions, e.g., slit sizes, run parameters (time, step size), tube power, etc. All of these should give you a good picture of instrument performance. Regarding sample changers, I believe some other manufacturers supply these with their benchtop instruments. Personally, I find these useful primarily in a production mode rather than for research. I have one and I seldom use it. An advantage of some is that they add the ability to spin samples. Best of luck with your search, it's always exciting to be able to purchase a new instrument. Rather than focus your search on a single instrument, it might be better in many ways to look at several different instruments/companies. Doing so often yields improved responsiveness and even price. If a company knows that you have decided on their instrument, most incentive is lost. I have not used the Panalytical benchtop instrument, but I have had good experiences with several others. Regards, David Bish ________________________________ From: rietveld_l-requ...@ill.fr <rietveld_l-requ...@ill.fr> on behalf of iangie <ian...@126.com> Sent: Wednesday, June 14, 2023 5:07 AM To: Shay Tirosh <stiro...@gmail.com> Cc: rietveld_l@ill.fr <rietveld_l@ill.fr> Subject: [External] Re:recommended questions to XRD supplier. This message was sent from a non-IU address. Please exercise caution when clicking links or opening attachments from external sources. Hi Shay, Every company will answer that their product is the best. I suggest you send typical samples you are going to run in the future, to each potential company and compare the demo data quality. In your contract state that "demo data need be resonably reproducible before acceptance", so the company won't dare to cheet with high configure data. This is how I buy machines. -- Dr. Xiaodong (Tony) Wang At 2023-06-14 14:50:26, "Shay Tirosh" <stiro...@gmail.com> wrote: Dear Rietvelds, We are currently exploring the possibility of acquiring a new benchtop XRD instrument, specifically the Benchtop XRD from Malvern-Pananalytical. We have scheduled a Zoom meeting with the supplier to discuss this further. Before the meeting takes place, I would like to prepare by gathering relevant information. Could you please provide some recommended questions that we can ask the supplier? We aim to gain a comprehensive understanding of the instrument and compare its performance to other options available. Feel free to suggest and comment. Thank you for your assistance. Best regards, Shay -- Dr. Shay Tirosh Materials Scientist. With focusing on Photovoltaics, Electrochemistry, Thin film coatings, and nanotechnology. Mobile: +972-(0)54-8834533 Email: stiro...@gmail.com<mailto:stiro...@gmail.com>
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