Sintered La10− x Nd x Si6O27 (x = 0, 0.1, 0.2, 0.3) by spark plasma sintering and its microstructure and electrical conductivity

Abstract

Abstract La10− x Nd x Si6O27 (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. La10− x Nd x Si6O27 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 La10− x Nd x Si6O27 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 La9.7Nd0.3Si6O27 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.

Keywords

• Nd3+ addition
• LSO
• SPS
• XRD
• Electrical conductivity