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The quasielastic neutron scattering from fast-ion conductors with the fluorite structure has been interpreted alternatively as being due to either clusters of defects or to the motion of defects and their associated strain field. In this paper, we examine the hypothesis that the sharp rise in ionic conductivity that occurs in fluorites near the transition temperature ( ) from normal to superionic conductivity, is associated with defect clustering. By using lattice simulation techniques it isdoi:10.1098/rspa.1987.0045 fatcat:bf2sieuqhjcjdjxryuiwcualkq