Porous and high-resistive ZnO ceramics were obtained by a stepwise doping method of Al2O3 and Li2O. Lithia increased the resistivity of ZnO doped with Al2O3 without a change of porous microstrucrure. The sensitivities of the stepwisely doped specimens to reducing gases at 300°C were improved compared to that of the singly doped specimens.
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Takuma et al. (1982) studied this question.
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