Demixing of Sodium and Calcium Ions in Montmorillonite Crystallites *
Rachel Levy* and C. W. Francis
Environmental Sciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37830, U.S.A.
Research sponsored by the U.S. Atomic Energy Commission under contract with Union Carbide Corporation.
On leave of absence from the Agricultural Research Organization, The Volcani Center, Bet Dagan, Israel. This research was made possible by a fellowship given to the senior author by the IAEA under Contract No. AID/csd 1582.