title: Crystalline Structure, Defect Chemistry and Room Temperature Colossal Permittivity of Nd-doped Barium Titanate.
abstract: Dielectric materials with high permittivity are strongly demanded for various technological applications. While polarization inherently exists in ferroelectric barium titanate (BaTiO3), its high permittivity can only be achieved by chemical and/or structural modification. Here, we report the room-temperature colossal permittivity (~760,000) obtained in xNd: BaTiO3(x = 0.5 mol%) ceramics derived from the counterpart nanoparticles followed by conventional pressureless sintering process. Through the systematic analysis of chemical composition, crystalline structure and defect chemistry, the substitution mechanism involving the occupation of Nd3+in Ba2+-site associated with the generation of Ba vacancies and oxygen vacancies for charge compensation has been firstly demonstrated. The present study serves as a precedent and fundamental step toward further improvement of the permittivity of BaTiO3-based ceramics.
authors.affiliation: State Key Laboratory of Mechanics and Control of Mechanical Structures, College of Aerospace Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China.|College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China.
authors.forename: Qiaomei
authors.initials: Q
authors.lastname: Sun
authors.affiliation: State Key Laboratory of Mechanics and Control of Mechanical Structures, College of Aerospace Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China.|College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China.
authors.forename: Qilin
authors.initials: Q
authors.lastname: Gu
authors.affiliation: State Key Laboratory of Mechanics and Control of Mechanical Structures, College of Aerospace Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China.
authors.forename: Kongjun
authors.initials: K
authors.lastname: Zhu
authors.affiliation: Department of Physics and Astronomy, Louisiana State University, Baton Rouge, LA 70803, USA.
authors.forename: Rongying
authors.initials: R
authors.lastname: Jin
authors.affiliation: College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China.
authors.forename: Jinsong
authors.initials: J
authors.lastname: Liu
authors.affiliation: State Key Laboratory of Mechanics and Control of Mechanical Structures, College of Aerospace Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China.
authors.forename: Jing
authors.initials: J
authors.lastname: Wang
authors.affiliation: State Key Laboratory of Mechanics and Control of Mechanical Structures, College of Aerospace Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China.
authors.forename: Jinhao
authors.initials: J
authors.lastname: Qiu