Fabrication and characterization of bismuth oxide-holmia nanofibers and nanoceramics (original) (raw)
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Fabrication and characterization of bismuth oxide-holmia nanofibers and nanoceramic
In this article, a novel and simple method to produce both boron doped and undoped holmia stabilized bismuth oxide nanoceramic materials has been put forward. Boron doped and undoped poly (vinyl alcohol)/bismuth-holmia acetate nanofibers were produced using the electrospinning technique and were calcined at 850 °C afterwards in order to obtain nanopowder. The characteristics of the nanofibers were investigated with FTIR, XRD, and SEM. XRDanalyses showed that boron undoped holmia stabilized bismuth oxide nanopowders have the face-centered cubic structure (δ-phase), and that the incorporation of boron atoms into the composite prevents the nucleus formation and turns the structure into a more amorphous glassy form. The SEM micrographs of the fibers showed that the addition of boron result in the formation of cross-linked bright-surfaced fibers. The average fiber diameters for electrospun boron doped and undoped PVA/ Bi-Ho acetate nanofibers were calculated using the ImageJ software as 102 nm and 171 nm, respectively.
Fabrication and characterization of bismuth oxideeholmia nanofibers and nanoceramics
Current Applied Physics Volume 13, Issue 3, May 2013, Pages 581–586, 2013
In this article, a novel and simple method to produce both boron doped and undoped holmia stabilized bismuth oxide nanoceramic materials has been put forward. Boron doped and undoped poly (vinyl alcohol)/bismutheholmia acetate nanofibers were produced using the electrospinning technique and were calcined at 850 C afterward in order to obtain nanopowder. The characteristics of the nanofibers were investigated with FT-IR, XRD, and SEM. XRD analyses showed that boron undoped holmia stabilized bismuth oxide nanopowders have the face-centered cubic structure (d-phase), and that the incorporation of boron atoms into the composite prevents the nucleus formation and turns the structure into a more amorphous glassy form. The SEM micrographs of the fibers showed that the addition of boron results in the formation of cross-linked bright-surfaced fibers. The average fiber diameters for electrospun boron doped and undoped PVA/BieHo acetate nanofibers were calculated using the ImageJ software as 102 nm and 171 nm, respectively
Journal of Composite Materials, 2013
In this study, boron doped and undoped Bi2O3-Er2O3 nanocomposite fibers were produced via electrospinning technique. Obtained fibers were turned into ceramics via calcination process. Obtained nanocomposite fibers and ceramics were characterized by Fourier transform infrared, x-ray diffraction, and scanning electron microscopy techniques. X-ray diffraction results show that boron undoped Bi2O3-Er2O3 ceramic consisted of face-centered cubic Bi2O3-Er2O3 phase. However, boron doped Bi2O3-Er2O3 ceramic consisted of orthorhombic phase. Crystallite sizes of the ceramics were evaluated using Scherrer’s equation. Crystallite sizes of boron doped and undoped ceramics were calculated as 50 and 17 nm, respectively. The average fiber diameters for boron doped and undoped poly vinyl alcohol/Bi-Er acetate nanofibers were calculated as 79 nm and 96 nm, respectively. The Brunauer Emmett teller results show that boron undoped and doped Bi2O3-Er2O3 nanocrystalline powder ceramic structures sintered at 800°C have surface area of 20.44 and 12.93 m2/g, respectively.
Preparation of Gadolina Stabilized Bismuth Oxide Doped with Boron via Electrospinning Technique
Journal of Inorganic and …
In this study, boron doped and undoped poly (vinyl) alcohol/bismuth–gadolina acetate (PVA/Bi–Gd) nanofibers were prepared using electrospinning technique then calcinated at 800 °C for 2 h. The originality of this study is the addition of boron to metal acetates. The effects of boron doping were investigated in terms of solution properties, morphological changes and thermal characteristics. The characteristics of the fibers were investigated with FT-IR, XRD, SEM and BET. The addition of boron did not only increase the thermal stability of the fibers, but also their diameters, which yielded stronger fibers. XRD analyses showed that boron doping increased the peak intensities and indicated that the boron doping enhanced the crystallite size. Moreover, no shifts were noticed in diffraction angles for boron doped and undoped samples. Therefore, boron doping did not significantly alter the lattice spacing. The SEM micrograph of the fibers showed that the addition of boron resulted in the formation of cross-linked bright-surfaced fibers. The average fiber diameter for boron doped and undoped fiber mats were 204 and 123 nm, respectively. Also, grain diameters of boron doped and undoped nanocrystalline sintered powders were measured as 140 and 118 nm, respectively. The BET results showed that boron undoped and doped Bi2O3–La2O3 nanocrystalline powder ceramic structures sintered at 800 °C have surface areas of 59.72 and 39.80 m2/g, respectively.
Synthesis and characterization of boron-doped Bi2O3-La2O3 fiber derived nanocomposite precursor
JOURNAL OF POLYMER RESEARCH, 2011
Boron doped poly(vinyl) alcohol/ bismuth - lanthanum acetate (PVA/Bi-La) nanofibers were prepared by electrospinning using PVA as a precursor. The effect of boron doping was investigated in terms of solution properties, morphological changes and thermal characteristics. The fibers were characterized by FT-IR, XRD, SEM and BET. The addition of boron did not only increase the thermal stability of the fibers, but also their diameters, which yielded stronger fibers. XRD analyses showed that boron doping increased the peak intensities and indicated that the boron doping enhanced the crystallite size. Moreover, no shifts were noticed in diffraction angles for boron doped and undoped samples. Therefore, boron doping did not significantly alter the lattice spacing. The SEM micrograph of the fibers showed that the addition of boron resulted in the formation of cross linked bright surfaced fibers. Also, grain diameters of boron doped and undoped nanocrystalline sintered powders were measured as 170 nm and 120 nm respectively. The BET results show that boron undoped and doped Bi2O3-La2O3 nanocrystalline powder ceramic structures sintered at 800 °C have surface areas of 20.44 m2/g and 12.93 m2/g, respectively.
Fabrication and characterization of boron doped BaZrO3 nanofibers via an electrospinning technique
In this study, boron doped and undoped poly(vinyl) alcohol/zirconium-barium acetate (PVA/Zr-Ba) nanofibers were prepared using an electrospinning technique then calcinated at three different temperatures; 250 oC, 500 oC, 800 oC for 2 h. The originality of this study is the addition of boron to metal acetates. The fibers were characterized by FT-IR, DSC, XRD and SEM. The addition of boron did not only increase the thermal stability of the fibers, but also increased their diameters, which gave stronger fibers. The FT-IR spectra of the fibers were in good accordance with literature data. The DSC results indicate that the glass transition (Tg) and melting temperatures (Tm) showed a change with the addition of boron. Also, boron doped fibers were observed to degrade at higher temperatures. XRD analyses showed that after further heat treatment at 800 oC, zirconia exists in two phases of tetragonal and monoclinic modifications. The systematic evolution of morphological features in the spun and the processed fibers were studied by scanning electron microscopy. The SEM appearance of the fibers showed that the addition of boron resulted in the formation of cross linked bright surfaced fibers.
In this study, boron doped poly(vinyl) alcohol/ HfO2 nanofibers were prepared by electrospinning using PVA as a precursor. The effect of boron doping was investigated in terms of solution properties, morphological changes and thermal characteristics. Nanofiber mats were calcined first at 800 oC. Then, the calcined products were pelleted and sintered at a rate of 8 °C/min and remained 2 h at 850 oC at atmospheric conditions to produce ultrafine ceramic nanocrystalline powders. The fibers and nanocrystalline powders were characterized by FT-IR, XPS, XRD and SEM. The addition of boron did not only increase the thermal stability of the fibers, but also their diameters, which yielded stronger fibers. The addition of boron did not only increase the thermal stability of the fibers, but also their diameters, which yielded stronger fibers.
Polymer-derived yttria stabilized bismuth oxide nanocrystalline ceramics
Ceramics İnternational, 2014
Boron doped and undoped Bi 2 O 3 –Y 2 O 3 nanofibers were synthesized by the electrospinning method. The nanofibers were then calcined to obtain nanocrystalline ceramics. The synthesized nanofibers and nanocrystalline ceramics were characterized using XRD, FT-IR, SEM and XPS. According to the XRD results the undoped Bi 2 O 3 –Y 2 O 3 nanocrystalline ceramic has a face-centered cubic structure. The XPS results show that nanocrystalline ceramics were pure Bi 2 O 3 , and there were no peaks related to either bivalent or tetravalent or pentavalent states in Bi 2 O 3. The XPS results also show that the crystallinity of the boron doped nanocrystalline ceramic was decreased because of the network former property of the boron. The average fiber diameters for electrospun boron doped and undoped PVA/Bi–Y acetate nanofibers were calculated as 179 nm and 96 nm, respectively. The SEM micrographs of the nanocrystalline ceramics show that the undoped Bi 2 O 3 –Y 2 O 3 ceramic has needle-like crystalline structure. However, the crystallinity of the boron doped Bi 2 O 3 –Y 2 O 3 ceramic decreased because of boron doping.