Search results for: N. Wakiya

Items from 1 to 10 out of 10 results

article

Mössbauer Studies of Composites Hydroxyapatite/Ferroxides

A. S. Kamzin, N. Wakiya

Physics of the Solid State > 2018 > 60 > 12 > 2608-2615

Magnetic composite (MC) particles consisting of finding hydroxyapatite and iron oxides (HAp/FeOxid), synthesized at both pyrolysis temperatures during MC synthesis, i.e., 800, 900, and 1000°C and at the various ferroxide concentrations in the HАp : FeOxid composite, i.e., 1 : 3, 1 : 2, and 1 : 1 (at a pyrolysis temperature of 1000°C). It is found that the HAp/FeOxid MCs are formed by the hydroxyapatite...

article

Magnetic Core/Shell Nanocomposites MgFe₂O₄/SiO₂ for Biomedical Application: Synthesis and Properties

A. S. Kamzin, H. Das, N. Wakiya, A. A. Valiullin

Physics of the Solid State > 2018 > 60 > 9 > 1752-1761

Magnetic core/shell (CS) nanocomposites (MNCs) are synthesized using a simple method, in which a magnesium ferrite nanoparticle (MgFe₂O₄) is a core, and an amorphous silicon dioxide (silica SiO₂) layer is a shell. The composition, morphology, and structure of synthesized particles are studied using X-ray diffraction, field emission electron microscopy, transmission electron microscopy (TEM), energy-dispersive...

article

Fabrication and optical properties of Pb(Mg_1/3Nb_2/3)O₃-PbTiO₃ thin films on Si substrates using the PLD method

K. Shinozaki, S. Hayashi, N. Wakiya, T. Kiguchi, more

IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control > 2008 > 55 > 5 > 1023 - 1028

Epitaxial 0.67Pb(Mg_1/3Nb_2/3)O₃-0.33PbTiO₃ (PMN-PT) thin films with electro-optic effects were fabricated on (La_0.5Sr_0.5)CoO₃(LSCO)/CeO₂/YSZ-buffered Si(001) substrates using double-pulse excitation pulsed laser deposition (PLD) method with a mask placed between the target and the substrate. Epitaxial growth of PMN-PT thin films was undertaken using the two-step growth method of PMN-PT film. The PMN-PT...

chapter

Fabrication and Optical Properties of Pb(Mg_1/3Nb_2/3)O₃-PbTiO₃ Thin Films on Si Substrates by PLD Method

K. Shinozaki, S. Hayashi, N. Wakiya, T. Kiguchi, more

2007 Sixteenth IEEE International Symposium on the Applications of Ferroelectrics > 851 - 854

2007 16th IEEE International Symposium on Applications of Ferroelectrics

Epitaxial 0.67Pb(Mg_1/3Nb_2/3)O₃-0.33PbTiO₃ (PMN-PT) thin films with electro-optic effects were fabricated on (La_0.5Sro.5)CoO₃(LSCO)/CeO₂/YSZ-bufferd Si(001) substrates by double-pulse excitation PLD method with a mask mechanism. Epitaxial growths of PMN-PT thin films were successively grown by the two step growth method of PMN-PT film. The PMN-PT seed layer was deposited on the LSCO layer at 500degC...

chapter

Effect of Back-Etching on Electrical Properties of PZT thin films

T. Ohno, T. Matsuda, M. Kosec, N. Wakiya, more

2007 Sixteenth IEEE International Symposium on the Applications of Ferroelectrics > 72 - 75

2007 16th IEEE International Symposium on Applications of Ferroelectrics

(lll)-oriented PZT(30/70) (PZT30) thin films were deposited on Pt/Ti/SiO₂/Si substrate by Chemical Solution Deposition (CSD). The part of the Si substrates of 500 mum thickness were etched from back side by a wet chemical etching process. The depth of the back-etching was controlled by changing the etching time (residual Si; 25-180 mum). Dielectric and ferroelectric properties for the PZT30 thin films...

article

Preparation of ferromagnetic zinc-ferrite thin film by pulsed laser deposition in the magnetic field

N. Wakiya, K. Muraoka, T. Kadowaki, T. Kiguchi, more

Journal of Magnetism and Magnetic Materials > 2007 > 310 > 2 Part 3 > 2546-2548

Zinc-ferrite (ZnFe ₂ O ₄ (ZF)) films were prepared by pulsed laser deposition. The film deposited without magnetic field at 500°C showed low magnetization of 7.43emu/g measured at room temperature. Application of magnetic field (2000G) during deposition of ZnFe ₂ O ₄ films increased the magnetization up to 56.6emu/g. This suggests that random distribution of Zn ...

article

Characterization of defect type and dislocation density in double oxide heteroepitaxial CeO2/YSZ/Si(001) films

C.H. Chen, T. Kiguchi, A. Saiki, N. Wakiya, more

Applied Physics A > 2003 > 76 > 6 > 969-973

Abstract. In order to qualitatively and quantitatively analyze the structural defects including the defect types and their concentrations in oxide heteroepitaxial films, a new X-ray rocking-curve width-fitting method was used in the case of doubleCeO2/YSZ/Si (YSZ=yttria-stabilized ZrO2) films that were prepared by pulsed laser deposition. Two main defect types, angular rotation and oriented curvature,...

article

Distinct correlation between CeO2 and YSZ in out-of-plane and in-plane mosaic dispersions of heteroepitaxial CeO2/YSZ/Si(001) films

C.H. Chen, A. Saiki, N. Wakiya, K. Shinozaki, more

Applied Physics A > 2002 > 74 > 5 > 693-697

Abstract. The structural correlations including the lattice constants and the mosaic dispersions between CeO2 and yttria-stabilized ZrO2 (YSZ) in CeO2/YSZ/Si(001) heteroepitaxial films have been investigated by out-of-plane and in-plane X-ray-diffraction techniques. The distinct linear correlations of the full width at half-maximum (FWHM) of the scan between CeO2 and YSZ have been found in both directions...

article

Effect of atmosphere on stability of Pb(Mg ₁ _/ ₃ Nb ₂ _/ ₃ )O ₃ (PMN) ceramics

B.-H. Kim, O. Sakurai, N. Wakiya, N. Mizutani

Materials Research Bulletin > 1997 > 32 > 4 > 451-459

The effect of atmosphere on the chemical stability of Pb(Mg ₁ _/ ₃ Nb ₂ _/ ₃ )O ₃ (PMN) ceramics at high temperature was examined. Heating the PMN pellet in air caused PbO vaporization to decompose PMN into a pyrochlore-type compound and Mg ₄ Nb ₂ O ₉ from surface toward the bulk. The decomposition rate was controlled by the Pb diffusion...

article

Thermal stability of Pb(Zn ₁ _/ ₃ Nb ₂ _/ ₃ )O ₃ (PZN) and consideration of stabilization conditions of perovskite type compounds

N. Mizutani, N. Wakiya, K. Shinozaki, N. Ishizawa

Materials Research Bulletin > 1995 > 30 > 9 > 1121-1131

Thermal stability of Pb(Zn ₁ _/ ₃ Nb ₂ _/ ₃ )O ₃ (PZN) single crystal was examined in the saturated PbO vapor at 1150°C for 2h and found that PZN single crystal decomposes into pyrochlore type compound, PbO and ZnO, which indicating that PZN is unstable at high temperature. The reason why PZN single crystal can be grown in the PbO flux at temperature higher than...

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