Sintered La_10−xNd_xSi₆O₂₇ (x = 0, 0.1, 0.2, 0.3) by spark plasma sintering and its microstructure and electrical conductivity

La_10−xNd_xSi₆O₂₇ (x = 0, 0.1, 0.2, 0.3) was synthesized via planetary grinding, and dense ceramic discs were prepared using SPS technology. The structure, microstructure, density, open porosity, total conductivity and electronic conductivity of the samples were measured and analyzed, respectively. La_10−xNd_xSi₆O₂₇ is characterized by a hexagonal apatite structure. The elements in the sample are distributed in a uniform manner and the content is consistent with the stoichiometry. The total conductivity of La_10−xNd_xSi₆O₂₇ exhibits an increase with the incorporation of Nd³⁺ content in the doped samples of x = 0.1, 0.2, and 0.3. The total conductivity of La_9.7Nd_0.3Si₆O₂₇ is the highest, reaching 5.39 × 10⁻³ S cm⁻¹ at 850 °C. The electron mobility of the sample is less than 1%, which is suitable for use as a solid electrolyte.