Relaxor in KF-doped BaTi{sub 2}O{sub 5} ceramics by spark plasma sintering

Journal Article · Mon Feb 04 00:00:00 EST 2008 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.2841712· OSTI ID:21016313

Jun, Xu ^[1]; Akishige, Yukikuni ^[2]

---

1. Research Project Promotion Institute, Shimane University, Matsue, Shimane 690-8504 (Japan)
2. Faculty of Education, Shimane University, Matsue, Shimane 690-8504 (Japan)

Dense BaTi{sub 2}O{sub 5} ceramics with KF doping up to 5 at. % were synthesized by spark plasma sintering (SPS). The SPS method enabled us to overcome the densifying difficulty in conventional sintering which is caused by the limit of the decomposing temperature of this metastable phase. We observed drastic KF-doping effect on the ferroelectric (FE) properties of BaTi{sub 2}O{sub 5}. Although there is only very small change in lattice parameters upon KF doping, the peak temperature in dielectric constant strongly decreases in an exponential way. The diffuseness of phase transition increases and FE relaxor state sets in for KF content as low as 1 at. %. Possible structural reasons for the effect and the implication for the nature of FE phase transition in BaTi{sub 2}O{sub 5} are discussed.

• OSTI ID: 21016313
• Journal Information: Applied Physics Letters, Vol. 92, Issue 5; Other Information: DOI: 10.1063/1.2841712; (c) 2008 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
BARIUM COMPOUNDS
CERAMICS
DOPED MATERIALS
FERROELECTRIC MATERIALS
LATTICE PARAMETERS
PERMITTIVITY
PHASE TRANSFORMATIONS
PLASMA
POTASSIUM FLUORIDES
SINTERING
TITANATES