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Journal Articles

X-ray diffuse scattering from carbon-ion-irradiated diamond

Sugai, Hiroyuki; Maeta, Hiroshi*; Matsumoto, Norimasa*; Kato, Teruo; Haruna, Katsuji*; Sataka, Masao; Ono, Fumihisa*

Physica Status Solidi (C), 4(8), p.2963 - 2966, 2007/07

 Times Cited Count:0 Percentile:0.02

The synthetic semiconductor diamond is potentially one of the best materials for electronic devices in severe environments like high temperature and radiation. We have studied the electrical transport properties of boron-doped synthetic semiconductor diamond and characterized natural and synthetic single crystal diamonds by measurements of the X-ray integrated scattering intensity, lattice parameter and diffuse scattering. The synthetic diamond were irradiated with 100 MeV carbon-ion at Tandem accelerator in JAEA-Tokai. After the irradiation, measurements of lattice parameters X-ray diffuse scattering were made at room temperature. The lattice parameters increased with ion fluence. The scattering intensity of the irradiated synthetic diamond diffuses asymmetrically to form a streak along the [-1 0 0] direction parallel to the reciprocal lattice vector. The result suggests that interstitial atoms and vacancies aggregate to form dislocation loop on the (100) plane.

Journal Articles

The Characterization of synthetic and natural single crystal diamonds by X-ray diffraction

Maeta, Hiroshi*; Matsumoto, Norimasa*; Haruna, Katsuji*; Saotome, Takao*; Ono, Fumihisa*; Sugai, Hiroyuki; Otsuka, Hideo; Ohashi, Kazutoshi*

Physica B; Condensed Matter, 376-377, p.283 - 287, 2006/04

 Times Cited Count:3 Percentile:18.82(Physics, Condensed Matter)

Natural and synthetic single crystal diamonds (type Ia, Ib, IIa and IIb) have been characterized by measurements of the X-ray integrated scattering intensity, lattice parameter and diffuse scattering. We found that the lattice parameter is smallest for natural diamond and largest for the B-doped diamond. We measured the diffuse scattering for (400) Bragg reflection for the four types of crystals. The scattering intensity of the natural crystals diffuses asymmetrically to form a streak along the [100] direction parallel to the reciprocal lattice vector. These results suggest the existence of the nitrogen atom platelets on (100) plane in the natural diamond. We also found the diffuse streaks along the [$$bar{1}$$00] direction for (400) Bragg reflection for the B-doped crystal, suggesting that boron atoms are likely to form precipitates on the (100) plane.

Journal Articles

Radiation defects in heavy ion-irradiated nickel at low temperature by X-ray diffuse scattering

Maeta, Hiroshi*; Matsumoto, Norimasa; Kato, Teruo; Sugai, Hiroyuki; Otsuka, Hideo*; Sataka, Masao

Nuclear Instruments and Methods in Physics Research B, 232(1-4), p.312 - 316, 2005/05

 Times Cited Count:1 Percentile:14.98(Instruments & Instrumentation)

no abstracts in English

Journal Articles

Sub-millimeter synchrotron X-ray focusing by crystal bender

Yoneda, Yasuhiro; Matsumoto, Norimasa; Furukawa, Yukito*; Ishikawa, Tetsuya*

Physica Scripta, T115, p.995 - 997, 2005/00

Sagittal focusing is known as one of the most efficient focusing methods for synchrotron X-rays which increases the photon density at the sample position. Results are reported on the performance of a fixed height exit bender with an unribbed silicon (311) crystal. The fixed height exit was achieved by using a 4-point bending mechanism. This bending mechanism is designed for the SPring-8 standard double crystal monochromator (DCM) of bending-magnet beamlines and the bender is installed as a second crystal of the DCM. By using unribbed crystal, the focusing beam size was kept 0.5 mm in the energy ranges from 35 - 60 keV. Since mirrors for high-energy X-rays are still under development at the moment, focusing techniques by crystal bender are demanded for many practical applications.

Journal Articles

Sagittal focusing bender for SPring-8 bending magnet beamlines

Yoneda, Yasuhiro; Matsumoto, Norimasa; Furukawa, Yukito*; Ishikawa, Tetsuya*

SPring-8 Riyosha Joho, 8(6), p.397 - 400, 2003/11

no abstracts in English

Journal Articles

Defect-induced phase separation in relaxor Pb(In$$_{1/2}$$Nb$$_{1/2}$$)O$$_3$$ crystals

Yoneda, Yasuhiro; Matsumoto, Norimasa; Terauchi, Hikaru*; Yasuda, Naohiko*

Journal of Physics; Condensed Matter, 15(3), p.467 - 474, 2003/01

 Times Cited Count:5 Percentile:32.41(Physics, Condensed Matter)

Thermal properties of ordered and disordered Pb(In$$_{1/2}$$Nb$$_{1/2}$$)O$$_3$$ (PIN) single clystals were investigated. The defect-induced phase separation provided a good agreement of the instability of the relaxor nd antiferroelectric states of the PIN crystals.

Journal Articles

Two-dimensional X-ray focusing by crystal bender and mirrors

Yoneda, Yasuhiro; Matsumoto, Norimasa; Furukawa, Yukito*; Ishikawa, Tetsuya*

AIP Conference Proceedings 705 (CD-ROM), 4 Pages, 2003/00

Results are reported on the performance of a fixed height exit bender with an unribbed silicon (311) crystal. The anticlasic crveture can be minimized for a recutangular Si (311) focusing crystal with "clamped" or "builtin" boundary conditions if the length to width ratio of the crystal is 1.42. The test crystal used in this study was manufactured from a 98mm$$times$$90mm$$times$$2mm dimension of float zone silicon. After final etching, the ratio of the crystal is 1.435. The sub-millimeter sagittal focusing was achieved by using a 4-point bending mechanism in energy ranges from 30keV to 60keV.

Journal Articles

Structural study of semiconductive CdTe-ZnTe alloy by high-energy X-ray diffraction

Yoneda, Yasuhiro; Matsumoto, Norimasa; Suzuya, Kentaro; Kohara, Shinji*; Mizuki, Junichiro

Ferroelectrics, 268, p.277 - 282, 2002/00

 Times Cited Count:5 Percentile:31.49(Materials Science, Multidisciplinary)

no abstracts in English

Journal Articles

Fixed-height exit bender of synchrotron X-rays above 40 keV

Yoneda, Yasuhiro; Matsumoto, Norimasa; Furukawa, Yukito*; Ishikawa, Tetsuya*

Journal of Synchrotron Radiation, 8(1), p.18 - 21, 2001/08

 Times Cited Count:40 Percentile:85.8(Instruments & Instrumentation)

no abstracts in English

Journal Articles

High energy synchrotron X-ray focusing by fixed exit bender

Yoneda, Yasuhiro; Matsumoto, Norimasa; Furukawa, Yukito*; Ishikawa, Tetsuya*

Nuclear Instruments and Methods in Physics Research A, 467-468(Part1), p.370 - 372, 2001/07

 Times Cited Count:6 Percentile:45.58(Instruments & Instrumentation)

no abstracts in English

Journal Articles

A Horizontal two-axis diffractometer for high-energy X-ray diffraction using synchtoron radiation on bending magnet beamline BL04B2 at SPring-8

Kohara, Shinji*; Suzuya, Kentaro; Kashihara, Yasuharu*; Matsumoto, Norimasa; Umesaki, Norimasa*; Sakai, Ichiro*

Nuclear Instruments and Methods in Physics Research A, 467-468(Part.2), p.1030 - 1033, 2001/07

 Times Cited Count:128 Percentile:99.13(Instruments & Instrumentation)

no abstracts in English

Journal Articles

Structural physics at JAERI-BL-14B1 beam line

Mizuki, Junichiro; Konishi, Hiroyuki; Nishihata, Yasuo; Takahashi, Masamitsu; Suzuya, Kentaro; Matsumoto, Norimasa; Yoneda, Yasuhiro

Nihon Kessho Gakkai-Shi, 42(1), p.68 - 75, 2000/02

no abstracts in English

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