As part of a goal to advance mineral technology, to reduce energy use, and to abate pollution, the Bureau of Mines generates thermodynamic quantities on various minerals and metals. This study on potassium aluminate was undertaken to further this aim. Although of possible importance to the cement and ceramic industries, the curent interest in potassium aluminate is its role in magnetohydrodynamic (mhd) power generation. Potassium in the form of a seed material used to enhance the electrical conductivity of the high-temperature mhd generator plasma, reacts with alumina. Alumina is a major constituent of coal slag and a material of construction in mhd power generators. A better understanding of the potassium and alumina interaction will help with the problems of corrosion, seed material recycling, etc.