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

RE: [EXTERNAL] Mounting Sample on High Temperature XRD Ribbon Heater

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

Re: [EXTERNAL] Mounting Sample on High Temperature XRD Ribbon Heater

Jools, You are right. “Lab grade” bottled N2 may have enough residual oxygen to cause problems, plus it is hard to purge the chamber properly to get the pO2 low enough to avoid issues. But an H2/N2 mix might not be suitable, especially if it destabilizes his sample. Here are some other ideas:

RE: [EXTERNAL] Mounting Sample on High Temperature XRD Ribbon Heater

Andrew, I agree completely. Pt does definitely have its problems, but it's hard to get radiant heaters that go so high in temperature. My feeling is that if you want to pursue HT-XRD in any serious fashion you need to accept the idea that Pt / Ta strips and thermocouples etc are "consumables"

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

Re: [EXTERNAL] Mounting Sample on High Temperature XRD Ribbon Heater

Thank you -- I will try nitrogen then! From: Payzant, Andrew Sent: Thursday, July 25, 2019 9:08 AM To: Mibeck, Blaise Cc: rietveld_l@ill.fr Subject: Re: [EXTERNAL] Mounting Sample on High Temperature XRD Ribbon Heater STOP!!! The tantalum foil should not

Re: [EXTERNAL] Mounting Sample on High Temperature XRD Ribbon Heater

Been a long day. I did have a new platinum ribbon heater and it working well! I would like to know this: how is the thermocouple attached to these ribbon heaters? (From Edmond- Buehler) Thanks for any more advice. I really appreciate the help! Get Outlook for Android