Dielectric Barrier Compound for Plasma Electrode

Give it a rest. Two significant technical questions in a few minutes suggests that your staff is not capable of proper materials analysis or selection.

The generalities you list are not adequate for any proper analysis. You need someone to look at specifics, which you do not supply.

Yes, it will cost some money. Free, general advice will only confuse you further.

Pay someone to answer your technical materials questions.

Lyn, I agree :) He would need a material engineer to satisfy the quest to his query. A material engineer with design and superconductivity in depth knowledge. He must hire a firm to be specific. His product must not only be design accurate but show mechanical engineering tests of product strength and tensile? :) Mechanical test of strength and vibration...

Please provide a sketch of your electrode.

Do you really mean alumina aka aluminium oxide/saphire/corundum_{(which is already a dielectric)} or do you mean aluminium _{(aluminum for you Yankees)} for the said tube?

Try Iridium for your center conductor.Very high melting point.(2410 deg. C.)

Very hard and corrosion resistant.Superior to Platinum in some high temp applications.

You might try asking Eric Lerner, of Lawrenceville Plasma Physics about his DPF experiments!