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Microstructural analyses and improved ionic conductivity of La0.62Li0.16TiO3 ceramics prepared by a reactive-templated grain growth (RTGG) process
Affiliation:1. Thin Film and Optical Manufacturing Technology Laboratory, Key Laboratory of Ministry of Education, Xi’an Technological University, Xi’an, 710032, China;2. Material Research Institute, Pennsylvania State University, University Park, PA, 16802, USA;3. College of Information Science and Engineering, Guilin University of Technology, Guilin, 541004, China;4. Materials Science & Component Technology Directorate, Naval Research Laboratory, Washington, D.C., 20375, USA;5. Electronic Materials Research Laboratory, Key Laboratory of Ministry of Education and International Center for Dielectric Research, Xi’an Jiaotong University, Xi’an, China;1. National Institute for Material Science, 1-1, Namiki, Ibaraki, Tsukuba 305-0044, Japan;2. Electroceramic Research Laboratory, College of Nanotechnology, King Mongkut''s Institute of Technology Ladkrabang, Bangkok 10520, Thailand;3. Advanced Material Research Unit, Faculty of Science, King Mongkut''s Institute of Technology Ladkrabang, Bangkok 10520, Thailand;4. Jozef Stefan Institute, Ljubljana 1000, Slovenia;5. Department of Chemistry, Faculty of Science, King Mongkut''s Institute of Technology Ladkrabang, Bangkok 10520, Thailand;1. Department of Engineering Mechanics, Northwestern Polytechnical University, Xi’an, China;2. School of Mechano-Electronic Engineering, Xidian University, Xi’an, China;3. School of Aeronautics, Northwestern Polytechnical University, Xi’an, China;1. Department of Materials Science and Engineering, Korea University, Seoul 136-701, Republic of Korea;2. Department of Nano-Bio-Information-Technology, KU-KIST Graduate School of Converging Science and Technology, Anam-dong 5-ga, Seongbuk-gu, Seoul 136-701, Republic of Korea;1. Dept. Electrocerámica, Instituto de Cerámica y Vidrio, CSIC, Kelsen 5, 28049, Madrid, Spain;2. Centro tecnológico Vidres, S.L., Ctra. Onda, Km 3.4, 12540, Villareal, Castellón, Spain;1. Condensed Matter Science and Technology Institute & School of Science, Harbin Institute of Technology, Harbin 150080, China;2. State Key Laboratory of New Ceramic and Fine Processing & School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China;3. National Laboratory of Solid State Microstructures & Department of Materials Science and Engineering, Nanjing University, Nanjing 210093, China;4. Department of Mathematics & Materials Research Institute, The Pennsylvania State University, University Park, PA 16802, USA
Abstract:Impedance measurements were conducted for textured lithium lanthanum titanate (LLTO) ceramics prepared by the reactive-templated grain growth (RTGG) process. Four La0.62Li0.16TiO3 cuboid ceramics with different degree of <110> crystal orientation were used for the measurement at temperatures from 298 to 423 K. The ionic conductivity of the specimen processed with 20% of the reactive template was one order of magnitude higher than that without a template. The high conductivity was attributed to the decrease of grain boundaries caused by the templated grain growth. No obvious anisotropic conductivity was detected for the specimens by the influence of grain and domain boundaries. Domain structures in the LLTO grains were observed by scanning electron microscopy (SEM) for all specimens.
Keywords:Lithium lanthanum titanate  Textured ceramic  Reactive template  Grain boundary  Microstructure
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