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Journal Articles

Structural analysis of (Ga,Mn)N epilayers and self-organized dots using MeV ion channeling

Kuroda, Shinji*; Marcet, S.*; Bellet-Amalric, E.*; Cibert, J.*; Mariette, H.*; Yamamoto, Shunya; Sakai, Takuro; Oshima, Takeshi; Ito, Hisayoshi

Physica Status Solidi (A), 203(7), p.1724 - 1728, 2006/05

 Times Cited Count:6 Percentile:31.35(Materials Science, Multidisciplinary)

no abstracts in English

Journal Articles

Blister formation in rutile TiO$$_{2}$$ (100) thin films by helium ion implantation

Yamamoto, Shunya; Nagata, Shinji*; Takeyama, Akinori; Yoshikawa, Masahito

Transactions of the Materials Research Society of Japan, 30(3), p.789 - 792, 2005/09

no abstracts in English

Journal Articles

Radiation-induced swelling and softening in magnesium aluminate spinel irradiated with high-flux Cu$$^{-}$$ ions

Lee, C. G.; Omura, Takahito*; Takeda, Yoshihiko*; Matsuoka, Saburo*; Kishimoto, Naoki*

Journal of Nuclear Materials, 326(2-3), p.211 - 216, 2004/03

 Times Cited Count:4 Percentile:29.35(Materials Science, Multidisciplinary)

Magnesium aluminate spinel of single crystal was irradiated with 60 keV Cu$$^{-}$$ at a dose rate up to 100 $$mu$$A/cm$$^{2}$$, to a total dose of 3$$times$$10$$^{16}$$ ions/cm$$^{2}$$, in order to study changes in hardness and step-height swelling by high-flux implantation. Hardness determined by nano-indentation measurements steeply decreased with implantation. There is a strong negative correlation between dose-rate dependences of the hardness and the step-height swelling: the former decreases as the latter increases. The Rutherford Backscattering Spectrometry (RBS)/channeling measurements showed that the spinel is not completely amorphized over the dose-rate range in this study, and the radiation-induced softening observed is not due to amorphization. Results of optical absorbance suggested that radiation-induced point defects and their clusters on the anion sublattices of the spinel played an important role in the radiation-induced swelling under high-flux ion implantation.

Journal Articles

Development of a large-solid-angle and multi-device detection system for elemental analysis

Sato, Takahiro; Ishii, Keizo*; Kamiya, Tomihiro; Sakai, Takuro; Oikawa, Masakazu*; Arakawa, Kazuo; Matsuyama, Shigeo*; Yamazaki, Hiromichi*

Nuclear Instruments and Methods in Physics Research B, 210, p.113 - 116, 2003/09

 Times Cited Count:1 Percentile:12.56(Instruments & Instrumentation)

A new detection apparatus for both low energy X-rays and back-scattered protons of MeV energy and its measurement system were developed. The detection apparatus consists of a multi-element detector, pre-amplifiers with active reset system and so on. The detector elements are arranged in the shape of a pentagonal pyramid and fully cover the sample. On each one detection side, 9 detector elements are arranged. The entire detection system consists thus of 45 detector elements. The micro-beam irradiates the sample through the center of the pentagonal pyramid and X-rays emitted from the sample are detected in close to $$pi$$ geometry. This novel detection setup has about 10 times the sensitivity of a conventional Micro-PIXE camera. The counting rate of back-scattered protons per detection element is small despite lack of a passive absorber. It appears possible that X-rays from the very small quantity of elements could also be detected. The advantage over a conventional Micro-PIXE camera includes simultaneous detection of back-scattered protons from N, C and O.

Journal Articles

Structure and optical properties of germanium implanted with carbon ions

Wei, P.; Xu, Y.; Nagata, Shinji*; Narumi, Kazumasa; Naramoto, Hiroshi

Nuclear Instruments and Methods in Physics Research B, 206(1-4), p.233 - 236, 2003/05

 Times Cited Count:6 Percentile:43.13(Instruments & Instrumentation)

no abstracts in English

Journal Articles

Fluorine-doping in titanium dioxide by ion implantation technique

Yamaki, Tetsuya; Umebayashi, Tsutomu; Sumita, Taishi*; Yamamoto, Shunya; Maekawa, Masaki; Kawasuso, Atsuo; Ito, Hisayoshi

Nuclear Instruments and Methods in Physics Research B, 206(1-4), p.254 - 258, 2003/05

 Times Cited Count:136 Percentile:98.93(Instruments & Instrumentation)

Single crystalline titanium dioxide (TiO$$_{2}$$) rutile were implanted with 200keV F$$^{+}$$ at a nominal fluence of 1$$times$$10$$^{16}$$ to 1$$times$$10$$^{17}$$ ions cm$$^{-2}$$ and then thermally annealed in air up to 1200$$^{circ}C$$ for 5h. The radiation damage and its recovery during the subsequent annealing were analyzed by Rutherford backscattering spectrometry in channeling geometry and variable-energy positron annihilation spectroscopy. The lattice disorder was completely annealed at 1200$$^{circ}C$$ by the diffusion of point defects to the surface acting as a sink. According to the secondary ion mass spectrometry, the F depth profile was shifted to a shallower region along with the damage recovery, finally producing an F-doped layer where the impurity concentration increased steadily towards the surface. The F doping proved to provide a small modification to the conduction-band edge of TiO$$_{2}$$, as assessed by theoretical band calculations.

Journal Articles

Characterization of epitaxial TiO$$_{2}$$ films prepared by pulsed laser deposition

Yamamoto, Shunya; Sumita, Taishi; Yamaki, Tetsuya; Miyashita, Atsumi; Naramoto, Hiroshi

Journal of Crystal Growth, 237-239(Part1), p.569 - 573, 2002/04

The epitaxial growth of TiO$$_{2}$$ films has attracted much interest from the viewpoints of basic science and applications. In the present study, it is shown that TiO$$_{2}$$ films with anatase or rutile structure can be grown by pulsed laser deposition(PLD) with an ArF excimer laser under the controlled O$$_{2}$$ atmosphere. The TiO$$_{2}$$ films were prepared on the LaAlO$$_{3}$$, LSAT SrTiO$$_{3}$$ and $$alpha$$-Al$$_{2}$$O$$_{3}$$ single crystal substrates. The epitaxial films were analyzed by RBS and X-ray diffraction for investigating the crystallographic relationships with the substrates. The high quality anatase TiO$$_{2}$$(001) films have been successfully grown on the LaAlO$$_{3}$$ (001), LSAT (001) and SrTiO$$_{3}$$ (001) substrates at temperatures above 500$$^{circ}$$C. Also the high quality rutile TiO$$_{2}$$(100) and (001) films were obtained on the $$alpha$$-Al$$_{2}$$O$$_{3}$$ (0001) and (10-10), respectively.The optical properties were characterized by optical absorption measurements. The optical band gaps for anatase and rutile TiO$$_{2}$$ epitaxial films were evaluated to be 3.22 eV and 3.11 eV, respectively.

Journal Articles

Preparation of epitaxial TiO$$_{2}$$ films by pulsed laser deposition technique

Yamamoto, Shunya; Sumita, Taishi; Sugiharuto; Miyashita, Atsumi; Naramoto, Hiroshi

Thin Solid Films, 401(1-2), p.88 - 93, 2001/12

 Times Cited Count:128 Percentile:96.81(Materials Science, Multidisciplinary)

The epitaxial growth of high-quality TiO$$_{2}$$ films has attracted much interest from the viewpoints of basic science and applications. In this study, it is shown that TiO$$_{2}$$ films with anatase and rutile structure can be prepared by pulsed laser deposition (PLD) with a Nd-YAG laser under the controlled O$$_{2}$$ atmosphere. The TiO$$_{2}$$ films with 200 nm thickness were prepared on the SrTiO$$_{3}$$, LaAlO$$_{3}$$, LSAT and $$alpha$$-Al$$_{2}$$O$$_{3}$$ single crystal substrates. The epitaxial films were analyzed by Rutherford backscattering spectrometry (RBS) combined with channeling and X-ray diffraction for the crystallographic relationships with the substrates. The high quality anatase TiO$$_{2}$$ (001) films have been successfully prepared on the LaAlO$$_{3}$$ (001), LSAT (001) and SrTiO$$_{3}$$ (001) substrates about 500$$^{circ}$$C substrate temperature. Also the high quality rutile TiO$$_{2}$$ (100) and TiO$$_{2}$$ (001) films were obtained on the $$alpha$$-Al$$_{2}$$O$$_{3}$$ (0001) and (10$$bar{1}$$0), respectively.

Journal Articles

Study on uptake of europium by the thin film of apatite and smectite mixture using RBS and micro-PIXE

Onuki, Toshihiko; Kozai, Naofumi; Samadfam, M.; Yamamoto, Shunya; Narumi, Kazumasa; Naramoto, Hiroshi; Kamiya, Tomihiro; Sakai, Takuro; Murakami, Takashi*

Nuclear Instruments and Methods in Physics Research B, 181(1-4), p.644 - 648, 2001/07

 Times Cited Count:4 Percentile:33.82(Instruments & Instrumentation)

no abstracts in English

Journal Articles

Preparation of TiO$$_{2}$$-anatase film on Si(001) substrate with TiN and SrTiO$$_{3}$$ as buffer layers

Sugiharuto; Yamamoto, Shunya; Sumita, Taishi; Miyashita, Atsumi

Journal of Physics; Condensed Matter, 13(13), p.2875 - 2881, 2001/04

 Times Cited Count:15 Percentile:61.92(Physics, Condensed Matter)

An epitaxial TiO$$_{2}$$-anatase thin film was grown on the Si(001) substrate with SrTiO$$_{3}$$/TiN as the buffer layers by pulsed laser deposition technique under an oxygen gas supply. The characterization of the epitaxial TiO$$_{2}$$-anatase film was performed using the X-ray diffraction method. The crystallographic relationships between the TiO$$_{2}$$-anatase film and SrTiO$$_{3}$$/TiN buffer layers were analyzed by the $$theta$$-2$$theta$$ scan and pole figure measurement. The growth direction of the films was determined as $$rm TiO_{2}langle 001rangle$$ / $$rm SrTiO_{3}langle 001rangle$$ / $$rm TiNlangle 001rangle$$ / $$rm Silangle 001rangle$$ and their in-plane relationship $$rm TiO_{2}{110}$$ // $$rm SrTiO_{3}{100}$$ // $$rm TiN{100}$$ // $$rm Si{100}$$. The crystalline quality of TiO$$_{2}$$-anatase was examined by the rocking curve analysis. The composition of the thin film packaging was characterized by Rutherford backscattering spectrometry (RBS) using 2.0 MeV $$^{4}$$He beam.

Journal Articles

RBS/NRA/channeling analysis of implanted immiscible species

Naramoto, Hiroshi; Yamamoto, Shunya; Narumi, Kazumasa

Nuclear Instruments and Methods in Physics Research B, 161-163, p.534 - 538, 2000/03

 Times Cited Count:1 Percentile:20.07(Instruments & Instrumentation)

no abstracts in English

Journal Articles

Molybdenum substitutional doping and its effects on phase transition properties in single crystalline vanadium dioxide thin film

Wu, Z. P.*; Miyashita, Atsumi; Yamamoto, Shunya; Abe, Hiroaki; Nashiyama, Isamu; Narumi, Kazumasa; Naramoto, Hiroshi

Journal of Applied Physics, 86(9), p.5311 - 5313, 1999/00

 Times Cited Count:59 Percentile:88.55(Physics, Applied)

no abstracts in English

Journal Articles

Effects of He implantation on radiation induced segregation in Cu-Au and Ni-Si alloys

Iwase, Akihiro; L.E.Rehn*; P.M.Baldo*; L.Funk*

Journal of Nuclear Materials, 271-272, p.321 - 325, 1999/00

 Times Cited Count:1 Percentile:13.16(Materials Science, Multidisciplinary)

no abstracts in English

Journal Articles

Characterization of single-crystalline Nb films on sapphire by RBS/channeling technique

Yamamoto, Shunya; Naramoto, Hiroshi; Narumi, Kazumasa; Tsuchiya, Bun*; Aoki, Yasushi; Kudo, Hiroshi*

Nuclear Instruments and Methods in Physics Research B, 134(3-4), p.400 - 404, 1998/00

 Times Cited Count:4 Percentile:40.69(Instruments & Instrumentation)

no abstracts in English

Journal Articles

Development of a fast multi-parameter data acquisition system for microbeam analyses

Sakai, Takuro; *; Hirao, Toshio; Kamiya, Tomihiro; *; *; Matsuyama, Shigeo*; *; Ishii, Keizo*

Nuclear Instruments and Methods in Physics Research B, 136-138, p.390 - 394, 1998/00

 Times Cited Count:18 Percentile:79.25(Instruments & Instrumentation)

no abstracts in English

Journal Articles

RBS/channeling analysis of damage and annealing processes of Nb-implanted TiO$$_{2}$$

Aoki, Yasushi; Yamamoto, Shunya; Takeshita, Hidefumi; Naramoto, Hiroshi

Nuclear Instruments and Methods in Physics Research B, 136-138, p.400 - 403, 1998/00

 Times Cited Count:7 Percentile:53.88(Instruments & Instrumentation)

no abstracts in English

Journal Articles

Ion irradiation effect on single-crystalline Cu/Nb and Nb/Cu/Nb layers on sapphire

Tsuchiya, Bun*; Yamamoto, Shunya; Narumi, Kazumasa; Aoki, Yasushi*; Naramoto, Hiroshi; Morita, Kenji*

Thin Solid Films, 335(1-2), p.134 - 137, 1998/00

 Times Cited Count:2 Percentile:16.05(Materials Science, Multidisciplinary)

no abstracts in English

Journal Articles

Sorption mechanism of europium by apatite using Rutherford backscattering spectroscopy and resonant nuclear reaction analysis

Onuki, Toshihiko; Kozai, Naofumi; Isobe, Hiroshi; Murakami, Takashi*; Yamamoto, Shunya; Aoki, Yasushi; Naramoto, Hiroshi

Journal of Nuclear Science and Technology, 34(1), p.58 - 62, 1997/01

 Times Cited Count:18 Percentile:78.84(Nuclear Science & Technology)

no abstracts in English

Journal Articles

Characterization of natural and synthesized FeTiO$$_{3}$$ crystals with RBS/PIXE/XRD

R.Q.Zhang*; Yamamoto, Shunya; Dai, Z.*; Narumi, Kazumasa; Aoki, Yasushi*; Naramoto, Hiroshi; Miyashita, Atsumi

International Journal of PIXE, 7(3&4), p.265 - 275, 1997/00

no abstracts in English

Journal Articles

Analysis of hydrogen in Nb thin films and Nb/Cu multilayers, using ion beam

Yamamoto, Shunya; Naramoto, Hiroshi; Aoki, Yasushi

Journal of Alloys and Compounds, 253-254, p.66 - 69, 1997/00

 Times Cited Count:5 Percentile:44.53(Chemistry, Physical)

no abstracts in English

25 (Records 1-20 displayed on this page)