Effects of the sintering temperature on the oxygen adsorption in ZnO ceramics

M.S. CASTRO Y C.M. ALDAO

JOURNAL OF THE EUROPEAN CERAMIC SOCIETY

Año: 1999 vol. 19 p. 511 - 515

0955-2219

Changes in electrical resistivity due to oxygen adsorption for samples prepared at di€erent sintering temperature are presented. It was found that samples cooled in steps from the sintering temperature show a higher resistivity and that oxygen indiffusion is faster in quenched samples and in samples sintered at low temperatures. Two mechanisms were determined to be responsible for an increase in the sample resistivity. First, oxygen adsorption at grains surfaces produces a rapid increase in resistivity and then a slow change in the response due to oxygendi€ffusion into the grains.