I had machined a solid 30mm aluminum plate for conducting heat on my stove. Aluminum is one of the best and cheapest metals to conduct heat aside from copper. Start with defining temperature, a measure of speed. It is quantity proportional to the square of the average speed of the molecules in the substance. This happens as the molecules wiggle in different directions.
The first day I was tempted to cook on it and I did but I am not sure that is a wise idea. The idea is that aluminum metal conducts best to distribute heat. The pan size and thickness should correspond to the size of the fire or it creates hot spots on the pan. I used the plaque to get an even distribution and avoid hot spots.