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- Title
Fabrication and dielectric properties of textured Na<sub>0.5</sub>Bi<sub>0.5</sub>TiO<sub>3</sub>-BaTiO<sub>3</sub> ceramics by RTGG method.
- Authors
Feng Gao; Li-Hong Cheng; Rong-Zi Hong; Jia-Ji Liu; Yong-Hong Yao; Chang-Sheng Tian
- Abstract
Grain-oriented Na0.5Bi0.5TiO3-BaTiO3 (NBTBT) ceramics were fabricated by reactive-templated grain growth using plate-like Bi2.5Na3.5Nb5O18 (BNN) as templates. The specimens are composed of NBTBT perovskite phase and BNN lay-structured phase. Textured ceramics have a brick-wall microstructure with strip-like grains aligning in the direction parallel to the casting plane and exhibit an {h00} preferred orientation. The texture fraction increases initially, and then decreases with increasing sintering temperature. The optimal sintering temperature is 1,185 °C where the texture fraction has a maximum value of 0.58 and d33 is 98 pC/N. The textured NBTBT ceramics show evidence of relaxor ferroelectrics with diffuse phase transition and frequency dispersion because of composite biphasic structure.
- Subjects
POWDER metallurgy; PEROVSKITE; OXIDE minerals; SINTERING; IRON metallurgy; PUDDLING (Metallurgy); FERROELECTRIC crystals; FERROELECTRIC RAM; OXIDES
- Publication
Journal of Materials Science: Materials in Electronics, 2008, Vol 19, Issue 12, p1228
- ISSN
0957-4522
- Publication type
Article
- DOI
10.1007/s10854-007-9547-3