Phase behavior of mixtures at very high pressure

The invention of the diamond anvil cell (DAC) has been an enormous stimulus to high-pressure research. This technique has only recently been used to investigate the behavior of binary systems, probably because of the extra experimental problems which arise in the study of mixtures. It is shown that a variety of aspects of the behavior of the mixture can, nevertheless, be studied under extreme conditions. Although the first investigations were carried out recently, some very interesting results have already been obtained. A variety of two-component systems has been studied, e.g., He-Kr, Ne-Xe, He-H2, NH3-H2O, and N2-He2. Some of the results are discussed. Finally, a comparison is made between experimental results and theoretical calculations