Effect of calcination temperature and atmosphere on crystal structure of BaTiO3 nanofibers
- Effect of calcination temperature and atmosphere on crystal structure of BaTiO3 nanofibers
- 이득용; 이명현; 조남인; 김배연; 오영제
- barium titanate (BaTiO3); fibers; annealing; crystal structure; transmission electron microscopy (TEM)
- Issue Date
- Metals and Materials International
- VOL 16, NO 3, 453-457
- Barium titanate (BaTiO3, BT) nanofibers with a diameter range of 160 nm to 300 nm were prepared by
drying electrospun BT/polyvinylpyrrolidone (BT/PVP) composite fibers for 1 h at 80 °C in vacuum with
a subsequent calcination in air for 1 h at a temperature range of 650 °C to 750 °C. The morphology and
crystal structure of calcined BT nanofibers were characterized with the aid of XRD, FT-IR, SEM, and TEM.
The XRD and FR-IR measurements confirm that BT nanofibers with a diameter of about 160 nm and a
tetragonal perovskite structure were present in the electrospun fibers after calcination for 1 h at 750 °C. The
FR-IR analysis of the BT fibers reveals that the intensity level of the O-H stretching vibration bands (at
and 1425 cm−1
) become weaker as the calcination temperature is increased and that a broad band
at 570 cm
, which represents the Ti-O vibration, appears sharper and narrower after calcination at 750 °C
due to the formation of metal oxide bonds. In contrast, BT fibers prepared by a refluxing process in a nitrogen
atmosphere show a dramatic change in crystal structure: the tetragonal structure changes to a cubic perovskite
structure, probably due to the suppression of carbonate contamination. Thus, the calcination temperature and
atmosphere appear to have a significant influence on the crystal structure of BT.
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