My experiment requires a two-section capacitor that has a high K in one section and a low K in another section. The same high voltage (30kv or so) will be across both sections. I have searched and searched for a powder that will likely bond well at the BaTiO3 interface during sintering, but have not been successful. Other titanates all seem to have relatively high K values. The ratio of high-K to low-K is important for the experiment - a ratio of 10-100 would be nice.
Does anyone know of such a low-K, high breakdown voltage powder? Or maybe I can mix something into BaTiO3 to reduce it's K by a factor of 100 without destroying its dielectric strength? Thank you.
I think TiO2 meets your requirements, it has low dielectric constant, high dielectric strength and it is likely to bond well at the BaTiO3 interface during sintering.
Thank you! Just what I was after, a compound that I could investigate. I'll look up optimal sintering temperatures for TiO2 - I plan on using 1100 C for the BaTiO3 section. After doing a bit of research, I found one source that estimated a K value of 19 when TiO2 is annealed at 600 C. Is K=19 low? I was hoping to find something around K=10 or less. Maybe I am too hopeful.
Hope is the key of the life.
For such values of K:
1- Al2O3 will be suitable if high mechanical strength is NOT considered (supposing the sintering at 1100oC).
2- glasses, such as soda-lime glass and Pyrex glass, can be used If their sintering is achieved, at low temperatures, after the sintering of BaTiO3.
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