If we perform our experiments at elevated temperatures (120 °C) in air, we occasionally observe electric arcs that we do not see if we perform the same experiments at ambient temperature or at -40 °C.
Is this due to our device or is it actually the dielectric strength of air that decreases at higher temperatures?
Dietmar,
Well, at higher temperatures and constant pressure the density of the air will be lessened - so the mean-free path of electrons and ions will be longer.
I would therefore expect the breakdown voltage to be reduced at higher temperatures - thus you would see arcs in hot air whereas in cold air you might not see them.
Dietmar,
Well, at higher temperatures and constant pressure the density of the air will be lessened - so the mean-free path of electrons and ions will be longer.
I would therefore expect the breakdown voltage to be reduced at higher temperatures - thus you would see arcs in hot air whereas in cold air you might not see them.
You may want to consider the relative humidity as this will also change your results.
Humidity changes conductivity
https://www.researchgate.net/publication/257174174_50_mol_indium_substituted_BaTiO3_Characterization_of_structure_and_conductivity
Temperature increase the energy of the charge.
You did not write your sample. The temperature you used maybe change your sample crystal structure. (Curie temperature)
https://www.researchgate.net/publication/243308466_Dielectric_properties_and_magnetoelectric_effect_of_xNiFe2O41-_xBa08Sr02TiO3_composites
Article 50 mol% indium substituted BaTiO3: Characterization of struc...
Article Dielectric properties and magnetoelectric effect of (x)NiFe2...
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