Galfenol is cool stuff. It’s iron doped with gallium. When under several gigapascals of force it is able to convert applied pressure to electricity at 70% efficiency when under magnetic field.
My understanding is the gallium slips through the iron lattice and aided by its diamagnetic nature it’s movement through the lattice assists in flipping the polar orientation of groups of iron molecules in a different direction thus causing change in magnetic field which could be collected by surrounding coil.
The pressures necessary to cause this are very high at between 25-55 gigapascals.
If there were a way to trap sodium bicarbonate in a piece of Galfenol I believe it would be a way to convert heat energy into electrical energy.
When sodium bicarbonate is heated at 176 degrees Fahrenheit it starts to break down into carbon dioxide, water and sodium carbonate.
So if sodium bicarbonate was somehow able to be trapped between the molecular lattice of Galfenol, would heat about 176 degrees Fahrenheit or above cause a significant increase of internal pressure of the material which would be useful for generating electricity?
Would the individual and scattered sodium bicarbonate molecules have a greater effect if dispersed throughout the material and have like a compound effect?
In the experiments which showed Galfenol under stress to generate electricity the pressure was applied at the top and bottom part of the material. By scattering the sodium bicarbonate throughout the inside of the Galfenol I believe it could achieve the same outcome by spreading out the workload and using heat to generate the distortion instead of applied external pressure.
There are other solid materials that when heated change phases and could be looked at as well.
Just a thot
Disclaimer to readers:
Don’t try at home I don’t know the outcome of this and that is why I’m asking this forum.