Hi,

Due to nature of my samples( reacts with Alumina Crucible at high temp) I'm using Zirconia Crucible, the working temperature is usually up to 2000°C and Beyond. Is this for kind of molten salt synthesis?

@ Ewa Jakubczyk:

Thank You.

No, it is not for molten salt synthesis. We were interested in carryinh out a solid state reaction.

I would advise you to check reactivity of your components with chosen crucible eg. zirconia crucible or  high purity Alumina crucible which also has high working temperatures ~1700 °C- both are good for solid state reaction.

A Graphite Crucible (for good heat tranfer) with the surface coating (Hand Coating ) of Alox or Zirconium Oxide, on which the sample is placed should do.

Are you sintering in Vaccum or in an Atmosphere?

@ Nithin Sharma

I am sintering in air.

Would it desirable to use an Alumina or Platinum crucible?

@ Ewa Jakubczyk:

While using zirconia crucible at higher temperatures, is there any zirconia contamination occuring for your sample?

Much depends on the actual salt or salt mixture being considered (not indicated in the enunciate). For instance; molten alkali chlorides are expected to attack platinum above approx. IOOO ºC, specially with lithium or potassium chlorides and under open oxidizing atmosphere (air). Attack by corrosive molten salts tends to increase with temperature and time. Higher temperatures may perhaps be admissible if the isolated fused salt(s) does not directly contacts the crucible.

Elsewhere at this forum, I have mentioned a few corrosion resistant materials for the NaCl―KCl―LiCl molten salt system; yet for much lower temperatures: https://www.researchgate.net/post/Can_someone_suggest_the_material_for_tank_of_NaCL_KCl_LiCl_mixture_about_500C