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(a–d) Fabrication process of multi-ceramic sensors, (e) schematic representation of doped-alumina matrix consisting of alumina, titanium dioxide and niobium oxide powders in a binder solution, (f) porous ceramic green-body due to evaporation of binder solution at 150 °C, (g,h) the titanium dioxide and niobium oxide additive solution becoming a liquid state at higher temperatures [92].
