[aNYCguy]

Why do your ideas require the magnetic element to be ceramic?

In any case, there are already magnetic ceramic materials. Your fridge magnets are made of ferrite, an oxide of iron (that's a ceramic).

And there are devices that convert heat (or more accurately temperature differences) into electricity. Look up thermoelectrics. They're nothing but a peltier junction run backwards.

[roadcat]

Why do your ideas require the magnetic element to be ceramic?

No particular reason. In this case, the ceramic would be a part of the beverage container, built-in at time of manufacture. Imagine having mugs that when you pour soda, the beverage self-cools. No ice, no watered-down drink. Or other beverages that stay cool without ice, and self-stir. No batteries or wires to contend with, and can be placed in a dishwasher without harm. I would patent it if I had a working prototype.