Analysis of Composite Structures on Barium Titanate Fine Particles Using Synchrotron Radiation

2006 ◽  
pp. 239-242 ◽  
Author(s):  
Takuya Hoshina ◽  
Hirofumi Kakemoto ◽  
Takaaki Tsurumi ◽  
Satoshi Wada ◽  
Masatomo Yashima ◽  
...  
Keyword(s):  
Synchrotron Radiation ◽  
Barium Titanate ◽  
Composite Structures ◽  
Fine Particles

Analysis of Composite Structures on Barium Titanate Fine Particles Using Synchrotron Radiation

2006 ◽  
Vol 301 ◽  
pp. 239-242 ◽  
Author(s):  
Takuya Hoshina ◽  
Hirofumi Kakemoto ◽  
Takaaki Tsurumi ◽  
Satoshi Wada ◽  
Masatomo Yashima ◽  
...  
Keyword(s):  
Synchrotron Radiation ◽  
Barium Titanate ◽  
Size Effect ◽  
Composite Structure ◽  
Composite Structures ◽  
Fine Particles ◽  
Rietveld Method ◽  
Diffraction Method ◽  
X Ray Diffraction ◽  
X Ray

The crystal structures of barium titanate (BaTiO3) fine particles with a size around 140 nm were investigated using a synchrotron radiation X-ray diffraction method. The observed diffraction pattern was analyzed by Rietveld method assuming several models. As a result, it is found that the BaTiO3 fine particles have composite structures include (a) a tetragonal region with a constant c/a ratio, (b) a tetragonal region with gradient c/a ratios and (c) a cubic region. In order to estimate these structures, the partial profile relaxation technique was applied in the Rietveld refinement. It is considered that the composite structure is important for the size effect on BaTiO3 fine particles.

Preparation of barium titanate ceramics from amorphous fine particles of the Ba–Ti–O system and its dielectric properties

1995 ◽  
Vol 10 (2) ◽  
pp. 306-311 ◽  
Author(s):  
S. Wada ◽  
T. Suzuki ◽  
T. Noma
Keyword(s):  
Dielectric Properties ◽  
Barium Titanate ◽  
Curie Temperature ◽  
Decomposition Method ◽  
Fine Particles ◽  
Nitrate Solution ◽  
Pressing Method ◽  
Calcination Temperatures ◽  
Grain Sizes ◽  
Titanate Ceramics

Using titanium nitrate solution stabilized by chelation, amorphous fine particles of the Ba-Ti-O system were prepared by the mist decomposition method in air. After calcination of these particles, barium titanate ceramics were prepared using the hot uniaxial pressing method, and various properties were investigated. As a result, the grain sizes could be controlled over the range from 58 nm to 187 nm by the sintering temperatures and/or the calcination temperatures, keeping the density almost constant. Moreover, the dielectric properties of the samples showed that the relative permittivity decreased with decreasing grain size, and Curie temperature also shifted to lower temperatures in the same way. In this study, we first found that Curie temperature existed in the barium titanate ceramics with grain sizes from 58 to 147 nm.

scholarly journals Role of Lattice Defects in the Size Effect of Barium Titanate Fine Particles

1996 ◽  
Vol 104 (1209) ◽  
pp. 383-392 ◽  
Author(s):  
Satoshi WADA ◽  
Takeyuki SUZUKI ◽  
Tatsuo NOMA
Keyword(s):  
Barium Titanate ◽  
Size Effect ◽  
Fine Particles ◽  
Lattice Defects

scholarly journals Interaction of a Ti–Cu Alloy with Carbon: Synthesis of Composites and Model Experiments

Materials ◽  
2019 ◽  
Vol 12 (9) ◽  
pp. 1482 ◽  
Author(s):  
Dina V. Dudina ◽  
Tomila M. Vidyuk ◽  
Michail A. Korchagin ◽  
Alexander I. Gavrilov ◽  
Natalia V. Bulina ◽  
...  
Keyword(s):  
Titanium Carbide ◽  
Ball Milling ◽  
Composite Structures ◽  
Fine Particles ◽  
Diffusion Processes ◽  
Carbon Sources ◽  
Copper Matrix ◽  
Model Experiments ◽  
Cu Alloy ◽  
Alloy Carbon

Titanium carbide (TiC), is the most thermodynamically stable compound in the Ti–C–Cu system, which makes it a suitable reinforcement phase for copper matrix composites. In this work, the interaction of a Ti–Cu alloy with different forms of carbon was investigated to trace the structural evolution leading to the formation of in-situ TiC–Cu composite structures. The reaction mixtures were prepared from Ti25Cu75 alloy ribbons and carbon black or nanodiamonds to test the possibilities of obtaining fine particles of TiC using ball milling and Spark Plasma Sintering (SPS). It was found that the behavior of the reaction mixtures during ball milling depends on the nature of the carbon source. Model experiments were conducted to observe the outcomes of the diffusion processes at the alloy/carbon interface. It was found that titanium atoms diffuse to the alloy/graphite interface and react with carbon forming a titanium carbide layer, but carbon does not diffuse into the alloy. The diffusion experiments as well as the synthesis by ball milling and SPS indicated that the distribution of TiC particles in the composite structures obtained via reactive solid-state processing of Ti25Cu75+C follows the distribution of carbon particles in the reaction mixtures. This justifies the use of carbon sources that have fine particles to prepare the reaction mixtures as well as efficient dispersion of the carbon component in the alloy–carbon mixture when the goal is to synthesize fine particles of TiC in the copper matrix.

THz region dielectric properties of barium titanate fine particles using infrared reflection method

2006 ◽  
Vol 26 (10-11) ◽  
pp. 1807-1810 ◽  
Author(s):  
Satoshi Wada ◽  
Hiroaki Yasuno ◽  
Takuya Hoshina ◽  
Hirofumi Kakemoto ◽  
Yoshikazu Kameshima ◽  
...  
Keyword(s):  
Dielectric Properties ◽  
Barium Titanate ◽  
Fine Particles ◽  
Reflection Method ◽  
Infrared Reflection

Defect structure and physical properties of barium titanate ultra-fine particles

2000 ◽  
Vol 291 (1-2) ◽  
pp. 203-212 ◽  
Author(s):  
B. Jiang ◽  
J.L. Peng ◽  
L.A. Bursill ◽  
T.L. Ren ◽  
P.L. Zhang ◽  
...  
Keyword(s):  
Barium Titanate ◽  
Physical Properties ◽  
Defect Structure ◽  
Fine Particles ◽  
Ultra Fine Particles
Sign in / Sign up

Export Citation Format

Share Document