Actually, i wouldn't recommend that either 😊 My experience with the Ta heaters is that they react with even the smallest amount of oxygen, and bottled N2 has more than enough to kill a Ta strip. The best result we had was with a H2/N2 mix, but that still failed (probably reaction with the sample). Personally I think the only reliable way to use them is with a high vacuum system (turbo pump), and with relatively inert samples.
Ultimately you are better off getting a Pt strip instead. Jools From: rietveld_l-requ...@ill.fr <rietveld_l-requ...@ill.fr> On Behalf Of Mibeck, Blaise Sent: torsdag 25. juli 2019 16.27 To: Payzant, Andrew <payza...@ornl.gov> Cc: rietveld_l@ill.fr Subject: Re: [EXTERNAL] Mounting Sample on High Temperature XRD Ribbon Heater Thank you -- I will try nitrogen then! ________________________________ From: Payzant, Andrew <payza...@ornl.gov<mailto:payza...@ornl.gov>> Sent: Thursday, July 25, 2019 9:08 AM To: Mibeck, Blaise <bmib...@undeerc.org<mailto:bmib...@undeerc.org>> Cc: rietveld_l@ill.fr<mailto:rietveld_l@ill.fr> <rietveld_l@ill.fr<mailto: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<mailto:payza...@ornl.gov> https://www.ornl.gov/staff-profile/e-andrew-payzant ****************************************************** From: <rietveld_l-requ...@ill.fr<mailto:rietveld_l-requ...@ill.fr>> on behalf of "Mibeck, Blaise" <bmib...@undeerc.org<mailto:bmib...@undeerc.org>> Reply-To: "Mibeck, Blaise" <bmib...@undeerc.org<mailto:bmib...@undeerc.org>> Date: Thursday, July 25, 2019 at 10:03 AM To: Rietveld list <rietveld_l@ill.fr<mailto: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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