Microstructure Study of BaTiO3 Ceramics Using Convergent Beam Electron Diffraction

Kobayashi, Keisuke; Suzuki, Toshimasa; Mizuno, Youichi

doi:10.4028/www.scientific.net/KEM.388.273

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Microstructure Study of BaTiO₃ Ceramics Using Convergent Beam Electron Diffraction
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HomeKey Engineering MaterialsElectroceramics in Japan XIMicrostructure Study of BaTiO3 Ceramics Using...

Microstructure Study of BaTiO₃ Ceramics Using Convergent Beam Electron Diffraction

Abstract:

The nanoscale local structure of core-shell structured BaTiO3 grains with a nonuniform dopant distribution was studied by convergent beam electron diffraction. The direct measurements of the variation of lattice parameter in an individual BaTiO3 grain were achieved. It was found that the lattice parameter continuously increased from inside the grain core to the grain shell and there was no discontinuity at the core/shell interface. The increasing gradient of c-axes was slightly smaller than that of a-axes, suggesting that the perovskite unit cell in the grain shell has lower tetragonality.

Info:

Periodical:

Key Engineering Materials (Volume 388)

Main Theme:

Electroceramics in Japan XI

Edited by:

Kazumi Kato, Tadashi Takenaka, Masasuke Takata and Kazuo Shinozaki

Pages:

273-276

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.388.273

Citation:

K. Kobayashi et al., "Microstructure Study of BaTiO₃ Ceramics Using Convergent Beam Electron Diffraction", Key Engineering Materials, Vol. 388, pp. 273-276, 2009

Online since:

September 2008

Authors:

Keisuke Kobayashi, Toshimasa Suzuki, Youichi Mizuno

Keywords:

BaTiO₃, CBED, Core-Shell, Lattice Parameter, Microstructure

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$41.00

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References

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Paper TitlePages

Effects of Annealing on Phase Formation and Critical Current Density of Dip-Coated Tl_0.5Pb_0.5 Sr_1.8Yb_0.2CaCu₂O₇ Superconducting Tapes

Authors: Faizah Md. Salleh, Ahmad K. Yahya, M.H. Ismail, M.H. Jumali

Abstract: In this study, single-core and multi-core Tl1212 tapes were fabricated from Tl-1212 superconducting powder of Tl0.5Pb0.5Sr1.8Yb0.2CaCu2O7 starting composition derived by conventional solid state synthesis. Single core tapes showed maximum Jc and enhanced 1212 phase formation were achieved for tapes annealed at a higher temperature for a longer duration. Multi core tapes showed a general increase in Ic and Jc with the number of tapes core. The highest Jc of 521 A/cm2 was observed for the 4-core tapes annealed at 870 °C for 90 minutes. The initial drastic drop of the tapes Jc in low magnetic fields (≤1T) indicates limitation on tapes performance by weak links. The low Jc of the tapes may be due to the lack of texture in the tapes core as revealed by SEM.

Composite Nanofibers for Textile Applications

Authors: X.J. Han, Z.M. Huang, L. Liu, C.L. He, Q.S. Wu, Yan Li

Abstract: Functional core-shell structured composite nanofibers can be fabricated by means of electrospinning of two polymer solvents in a coaxial, two-capillary spinneret system. Three groups of composite nanofibers, Nylon-6(cell)/PVA(core), PC(cell)/ PU(core) and PU(cell)/Nylon-6(core), have been developed using this technique. Morphological, structural, and mechanical characterizations are conducted for the developed composite nanofibers and their applications as textile materials have been explored.

1237

Preparation and Characterization of Core-Shell Type Versatate-Fluorocarbon Emulsion

Authors: Xiao Hui Gao, Yu Feng Li, Zhou Mao Yu

Abstract: Versatate-fluorocarbon emulsion with core-shell structure was synthesized by seeded emulsion polymerization using versatate, organic fluorine and acrylate as raw materials. The influences of amount of organic fluorine and versatate, core-shell ratio on the properties of emulsion were discussed. The emulsion was characterized with contact angle analyzer, particle size, transmission electron microscopy (TEM), scanning electron microscope (SEM) and energy dispersive spectroscopy (EDS). The results showed that the emulsion had good properties while w(organic fluorine)=6%, w(versatate)=8%, soft core-hard shell and w(core):w(shell)=3:2. The particle size is 110nm and with core-shell structure. The contact angle of emulsion film to water is 98.1º. The synergistic effect of versatate and fluorocarbon based on core-shell structure improve the over-all properties effectively.

2055

Synthesis and Properties of CdSe/Cd_XZn_1-XS Quantum Dots

Authors: Jie Yang, Yu Lan Zhang, Rui Li Zhang, Ning Liu, Zhi Min Yuan, Ai Yu Zhang, Yong Qiang Cao, Yuan Na Zhu, Ping Yang

Abstract: Highly luminescent CdSe/Cd_xZn_1-xS core-shell quantum dots (QDs) were synthesized using CdSe cores with the size range of 2 to 5 nm in diameter through a facile organic route. The CdSe cores were prepared by using trioctylphosphine oxide and hexadecylamine as capping agents for the purpose of getting spherical morphology. The cores were coated with an alloy shell to decrease the lattice mismatch between the core and the shell through a facile organic approach. The QDs exhibited tunable photoluminescence (PL) up to 654 nm, narrow PL spectra (less than 40 nm for full width at half maximum) and high PL efficiency. Such properties make the core-shell QDs as a good candidate for further applications.

1203

Fabrication and Characterization of Core-Shell Structured Composite Nanofibrous Scaffolds by Coaxial Electrospinning

Authors: Qing Ye, Kui Hua Zhang, Sheng Bao Ke, Chao Liang Wang, Hong Yi Zhang, Jian Ye Wang

Abstract: Biodegradable core-shell structured nanofibrous scaffolds with silk fibroin (SF) and poly(L-lactic acid-co-ε-caprolactone) (P(LLA-CL)) blends as shell and bovine serum albumin (BSA)-containing SF as core were fabricated by coaxial electrospinning. Morphology and microstructure of the nanofibers were characterized by scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The results demonstrated that core-shell structured nanofibers were obtained, furthermore, the nanofibers became greatly uniform and the average diameters were thinner in comparison with only core BSA solution after adding 10-20 w/v% SF in core BSA solution. The 13C NMR clarified the SF conformation transformed from random coil to β-sheet when treated with 75 w/v % ethanol vapor. The mechanical test showed core-shell structured nanofibrous scaffolds possessed good mechanical properties but lower than SF/P(LLA-CL) blended nanofibrous scaffolds.

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