Ionic conductivities have been investigated for lanthanoid silicates of the Lnlo(Si04)603 solid solution series and related compounds. The activation energy and conductivity at 500 "C were estimated to be 69 kJ mol-' and 1.8 x S cm-' for Lalo(Si04),03 and 71 kJ mol-' and 1.5 x ~O -~ Scm-' for Ndlo(Si04),03. The a and c lattice constants of the hexagonal phase decreased with decreasing radius of the Ln3+ ion for Lnl0(SiO4),O3 (Ln = La, Nd, Sm, Gd and Dy). The activation energy increased and the conductivity decreased when Ln3+ ions with smaller ionic radii were used. The sole carrier in these materials is the 0'ion.

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The absorption cross sections and the differential elastic-scattering cross sections of antiprotons on carbon, aluminum, and copper nuclei were systematically measured at six beam momenta between 470 and 880 MeV/c. From these data, the antiproton-nucleus optical potential was derived for the first time.

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