| Cationic doping in solid electrolytes is one of the most effective means to improve the conductivity of solid electrolytes.Generally,the migration channel of the conductive ionsis expandedby increasing the cell volume of the electrolyte,or the NASICON structure of the material is stabilized by reducing the lattice volume,both of which can improve conductivity.The solid electrolyte(Al0.2Zr0.8)4/3.8NbP3-xTaxO12（x=00.2）with NASICON type structure obtained by high temperature solid phase method;(Al0.2Zr0.8)4/3.8NbP2.9Ta0.1O12（x=0.1）has the highest density and the highest conductivity.The conductivity of the sample reaches 4.86×10-4 S·cm-1 at 500℃;DC polarization test confirmed that the sample is pure Al3+conduction;The Al sensor based on(Al0.2Zr0.8)4/3.8NbP2.9Ta0.1O12 has better sensitivity,faster response and stable response curve,and the Nernst equation is used between the response value and the aluminum concentration.The solid electrolyte(Al0.2Zr0.8)（4+x）/3.8Nb1-xGexP3O12（x=00.2）prepared by substituting Ge for Nb has a NASICON structure;When x=0.1,the sample has the best density and the highest conductivity,reaching 3.17×10-4 S·cm-1 at 500℃;DC polarization testing showed that the sample was purely Al3+ion conducting.The Al sensor based on(Al0.2Zr0.8)4.1/3.8Nb0.9Ge0.1P3O12 has a faster response time but a less stable response signal,and the Nernst equation is still used between the response and the aluminum concentration.(Al0.2Zr0.8)4/3.8Nb1-xTaxP3O12（x=00.2）prepared by partially substituting Ta5+for Nb in(Al0.2Zr0.8)20/19Nb（PO4）3 is a NASICON structure;(Al0.2Zr0.8)4/3.8Nb0.9Ta0.1P3O12（x=0.1）has the highest density and the highest conductivity,and the conductivity is 2.32×10-4S·cm-1 at 500℃;DC polarization test shows that the sample is purely Al3+ion conduction;The Al sensor prepared by using(Al0.2Zr0.8)4/3.8Nb0.9Ta0.1P3O122 as a solid electrolyte responds quickly and the response signal is stable,and the Nernst theoretical equation is followed between the response value and the aluminum concentration.Figure36;Table13;Reference 62... |
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