Abstract
A series of Li-doped lanthanoide silicates, LixLn1-x(SiO4)6O3-x (Ln=La, Nd), were prepared by the solid phase reaction and their ionic conductivities were evaluated. The Li-doping gave the apatite crystal structures (hexagonal, P63/m) analogous to Ln10(SiO4)6O3. The Li-doping was limited up to around x=2 for Ln=La and around x=3.5 for Ln=Nd. In the region of low Li-contents, oxide ion conduction characteristic for Ln10(SiO4)6O3 was still dominant. With an increase in the Li-content, the component of Li-ion conduction emerged due to the formation of lithium silicate glassy phase existing at the grain-boundaries. The O2 and CO2 sensor measurements using the sinters well supported the results of the conductivity analyses. Thus it was found that varying the Li-content could regulate an ionic conductivity and carrier. These properties of the Li-doped lanthanoid silicates might give a good compatibility into the two conduction layers junction, oxide ion conductor//alkali ion conductors fundamental to solid electrolyte gas sensors.
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