The (Al0.2Zr0.8)20/19Nb(PO4)3solid electrolyte was synthesized by the coprecipitationmethod; Al2(WO4)3solid electrolyte was synthesized by the coprecipitation and the sol-gel method. Added with different amount of ZnO, the phase composition, microstructureand electrical conducting property of samples are characterized by XRD, SEM and EIS,respectively. Studied the stability of (Al0.2Zr0.8)20/19Nb(PO4)3and Al2(WO4)3in500℃galvanizing zinc. Prepared Al sensor with (Al0.2Zr0.8)20/19Nb(PO4)3and Al2(WO4)3as thesolid electrolyte. The results show that::The different ZnO doping ratio have a great effect on the phase composition andmicrostructure. At a certain sintering temperature,(Al0.2Zr0.8)20/19Nb(PO4)3was formed ofNASICON structure, and formed of Al2(WO4)3pure phase structure, there is no impurityphase generation. There was no ZnO phase appeared, which showed ZnO reacted with(Al0.2Zr0.8)20/19Nb(PO4)3and Al2(WO4)3. The grain size and the density of samplesincrease with increasing the ZnO amount.The stability tests determined that (Al0.2Zr0.8)20/19Nb(PO4)3and Al2(WO4)3werestability in the galvanizing zinc, the diffraction peak intensity, peak shape and peakposition hardly change. The SEM showed the section of the samples was density withoutholes.The ion transference number tests determined that (Al0.2Zr0.8)20/19Nb(PO4)3testedunder different voltage, the Al ion transference number were above0.99, which showedthat the main conduction ion is Al3+, electronic conduction can be ignored; Al2(WO4)3tested under different voltage, the Al ion transference number were above0.96, whichshowed that the main conduction ion is Al3+, electronic conduction can be ignored.The (Al0.2Zr0.8)20/19Nb(PO4)3with5%ZnO sintered at1300℃had the highestconductivity,1.24×10-3S·cm-1at700℃, Al2(WO4)3was synthesized by thecoprecipitation method with1%ZnO sintered at1000℃, the highest conductivity was4.27×10-4S·cm-1at800℃,Al2(WO4)3was synthesized by the sol-gel method with1%ZnO sintered at1000℃, the highest conductivity was2.55×10-4S·cm-1at800℃. TheAl sensor is prepared with (Al0.2Zr0.8)20/19Nb(PO4)3and Al2(WO4)3has the respond to theAl concentration in the hot zinc solution. |