Journal
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
Volume 53, Issue 1, Pages 43-49Publisher
SPRINGER
DOI: 10.1007/s10971-009-2054-7
Keywords
Barium strontium titanate (BaSrTiO3); Polyvinylpyrrolidone (PVP); Electrospinning; Nanofibers; Calcination temperature; Ti-O bond; Cubic perovskite structure
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Funding
- Ministry of Knowledge Economy (MKE), Republic of Korea [RTI04-01-02]
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Ba1-x Sr (x) TiO3(x = 0-0.5, BST) nanofibers with diameters of 150-210 nm were prepared by using electrospun BST/polyvinylpyrrolidone (PVP) composite fibers by calcination for 2 h at temperatures in the range of 650-800 A degrees C in air. The morphology and crystal structure of calcined BST/PVP nanofibers were characterized as functions of calcination temperature and Sr content with an aid of XRD, FT-IR, and TEM. Although several unknown XRD peaks were detected when the fibers were calcined at temperatures less than 750 A degrees C, they disappeared with increasing the temperature (above 750 A degrees C) due to its thermal decomposition and complete reaction in the formation of BST. In addition, the FT-IR studies of BST/PVP fibers revealed that the intensities of the O-H stretching vibration bands (at 3430 and 1425 cm(-1)) became weaker with increasing the calcination temperature and a broad band at 540 cm(-1), Ti-O vibration, appeared sharper and narrower after calcination above 750 A degrees C due to the formation of metal oxide bonds. However, no effect of Sr content on the crystal structure of the composites was detected.
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