Thank you -- I will try nitrogen then!
________________________________ From: Payzant, Andrew <payza...@ornl.gov> Sent: Thursday, July 25, 2019 9:08 AM To: Mibeck, Blaise <bmib...@undeerc.org> Cc: rietveld_l@ill.fr <rietveld_l@ill.fr> Subject: Re: [EXTERNAL] Mounting Sample on High Temperature XRD Ribbon Heater STOP!!! The tantalum foil should not be used for high temperature in air. Above a few hundred degrees Celsius it will oxidize rapidly and disintegrate. I accidently learned this the hard way many years ago! ? Either use an inert atmosphere or vacuum. Or use a different heater ribbon, suitable for air atmosphere. Andrew ***************************************************** Dr. E. Andrew Payzant Materials Engineering Group Leader Neutron Scattering Division Neutron Sciences Directorate Mailing address: Oak Ridge National Laboratory Dr. E. Andrew Payzant P.O. Box 2008 Bldg. 8600, MS 6475 Oak Ridge, TN 37831 cell: (865) 235-4981 email: payza...@ornl.gov https://www.ornl.gov/staff-profile/e-andrew-payzant ****************************************************** From: <rietveld_l-requ...@ill.fr> on behalf of "Mibeck, Blaise" <bmib...@undeerc.org> Reply-To: "Mibeck, Blaise" <bmib...@undeerc.org> Date: Thursday, July 25, 2019 at 10:03 AM To: Rietveld list <rietveld_l@ill.fr> Subject: [EXTERNAL] Mounting Sample on High Temperature XRD Ribbon Heater I am looking for advice on how to prepar a HTXRD sample (mounting techniques, stage preparation, etc...). The ribbon heater is tantalum (brand new). The sample contained ammonium di-hydrogen phosphate. The atmosphere is air. I hope to reach at least 1100C, but have had the ribbon break before 750C. Corrosion? or can the sample lower electrical resistance? Please, any advice. All the best, Blaise
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