Impedance study of spark–plasma–sintered lutetium titanate ceramics: Effect of post–annealing. Issue 13 (September 2019)

• Record Type: Journal Article
• Authors: An, Liqiong; Zhang, Jian; Fan, Runhua; Goto, Takashi; Wang, Shiwei
• Is Part Of: Ceramics international. Volume 45:Issue 13(2019)
• Page Start: 16317
• Page End: 16322
• Publication Date: 2019-09
• Subjects: Pyrochlore -- Lu2Ti2O7 -- Post–annealing -- Electrical conductivity; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2019.05.158
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: After a post–annealing treatment, spark-plasma-sintered (SPSed) black lutetium titanate (Lu2 Ti2 O7 ) became colorless and the transmittance at 550 nm increased from zero to 57%. To investigate the effect of post-annealing, transmission electron microscopy, X–ray photoelectron spectroscopy, and impedance spectroscopy were performed on the SPSed Lu2 Ti2 O7 body before and after annealing. Clean grain boundaries and triple junctions with high crystallinity were observed in both samples. X–ray photoelectron spectra revealed that both carbon contamination and lattice defects existed in the sample before annealing. The post-annealing process could help to eliminate the carbon contamination and compensate for defects. The Lu2 Ti2 O7 body exhibited higher bulk conductivity at relatively low temperatures before annealing than that after annealing and the possible cause was analyzed.