新規な多価カチオン伝導性セラミックスの開発とその応用

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  • Novel Multivalent Cation Conducting Ceramics and Their Application
  • Special Article: The 59th CerSJ Awards for Academic Achievements: Novel Multivalent Cation Conducting Ceramics and Their Application

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Among the trivalent ion conductor series of Sc2(WO4)3 type and NASICON type that we have reported, the highest ion conductivity was obtained for the trivalent Al3+ ion conducting NASICON type (AlxZr1-x)4/(4-x)Nb(PO4)3 solid electrolyte and the value enters the area between yttria stabilized zirconia (YSZ) and calcia stabilized zirconia (CSZ) of well known commercialized high oxide anion conductors. The enhancement of both the ion conductivity and the mechanical strength was simultaneously realized by adding B2O3 as a sintering agent during the sintering procedure. The Al3+ ion conducting (AlxZr1-x)4/(4-x)Nb(PO4)3 solid electrolyte with the B2O3 additive was combined with YSZ, and the refractory oxide based solid was set on the (AlxZr1-x)4/(4-x)Nb(PO4)3 solid surface as the individual auxiliary electrode for carbon dioxide (CO2), nitrogen oxides (NOX), sulfur dioxide (SO2) gas sensing, respectively. The sensor response was rapid, reproducible and continuous with obeying the Nernst theoretical relationship.<br>

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