POINT DEFECTS IN OXIDES.REDUCTION OF IMPURITY IONS IN MgO BY CURRENT FLOW AT HIGH TEMPERATURE R.A. WEEKS, E. SONDER, J.C. PIGG and K.F. KELTON J. Phys. Colloques, 37 C7 (1976) C7-411-C7-414 DOI: 10.1051/jphyscol:1976794