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采用凝胶燃烧-等离子氮杂方法制备了磷灰石型硅酸镧(La9.33Si6O26-1.5xNx)固体电解质,并对氮杂样品进行了XRD、FT-IR和Raman表征,测试了样品的热稳定性及电导率。结果表明:La9.33Si6O26-1.5xNx的六边磷灰石型物相结构不变。氮杂导致硅酸镧晶体结构中[SiO4]的环境发生改变,并影响其振动模式。TG-DSC分析表明氮杂硅酸镧的烧结温度应为1 200℃。在微波功率为300W,作用时间为15min条件下制备的氮杂硅酸镧的烧结体的电导率达1.28×10-2 S.cm-1(800℃)。初步分析认为氮杂导致通道氧空位浓度增加、氧离子迁移速率加快、电导率变大,形成空间电导增强效应。
The lanthanum-lanthanum silicate (La9.33Si6O26-1.5xNx) apatite solid electrolyte was prepared by the gel-plasma-aza method. The azo samples were characterized by XRD, FT-IR and Raman. The thermal Stability and conductivity. The results show that the hexagonal apatite structure of La9.33Si6O26-1.5xNx does not change. Aza leads to a change in the [SiO 4] environment in the lanthanum silicate crystal structure and affects its vibrational modes. TG-DSC analysis showed that the sintering temperature of lanthanum azasilicate should be 1 200 ℃. The electrical conductivity of the sintered lanthanum azasilicate prepared under the microwave power of 300W and the action time of 15min reached 1.28 × 10-2 S.cm-1 (800 ℃). The preliminary analysis shows that aza is leading to the increase of the channel oxygen vacancy concentration, the oxygen ion migration rate is accelerated, the conductivity is larger, and the space conductivity enhancement effect is formed.