Speaker
Ms
Pimpilai Wannasut
(Department of Physics and Materials Science, Faculty of Science, Chiang Mai University, Chiang Mai, THAILAND 50200)
Description
This research studied the effect of LiSbO${}_3$ on microstructure and electrical properties of lead-free Bi${}_{0.5}$(Na${}_{0.80}$K${}_{0.20}$)${}_{0.5}$TiO${}_3$ ceramics with the composition belonging to Bi${}_{0.5}$(Na${}_{0.80}$K${}_{0.20}$)${}_{0.5}$TiO${}_3$-LiSbO${}_3$ or (1-$x$)BNKT-$x$LS(when $x$ = 0, 0.005, 0.010, 0.015, 0.020 mol fraction). The BNKT-LS ceramics were prepared by a conventional mixed oxide method and sintered at 1100${}^{\circ}$C for 2h. X-ray diffraction pattern of all compositions exhibited a single perovskite structure without impurity phase. Scanning electron microscopy (SEM) was used to determine the microstructure of ceramics. Pure BNKT ceramic promoted a formation of cubic-like shape grains with an average grain size of 0.25 ± 0.05 mm. With increasing LS concentration, average grain size value gradually increased and showed the maximum value of 0.34 ± 0.10 mm at $x$ = 0.02. The addition of LS into BNKT ceramic did not obviously change grain morphology, however, it caused fracture surface to switch from mixed inter-transgranular fracture for pure BNKT to mainly transgranular fracture for LS-added samples. A large room temperature dielectric constant of 1367 and dielectric loss of 0.0435 were observed for BNKT-0.015LS sample.
Author
Ms
Pimpilai Wannasut
(Department of Physics and Materials Science, Faculty of Science, Chiang Mai University, Chiang Mai, THAILAND 50200)
Co-authors
Prof.
Anucha Watcharapasorn
(Department of Physics and Materials Science, Faculty of Science, Chiang Mai University, Chiang Mai, THAILAND 50200)
Dr
Pharatree Jaita
(Department of Physics and Materials Science, Faculty of Science, Chiang Mai University, Chiang Mai, THAILAND 50200)
Prof.
Sukanda Jiansirisomboon
(Department of Physics and Materials Science, Faculty of Science, Chiang Mai University, Chiang Mai, THAILAND 50200)
