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Fe
intermetallic compoundCao, Y.*; Zhou, H.*; Khmelevskyi, S.*; Lin, K.*; Avdeev, M.*; Wang, C.-W.*; Wang, B.*; Hu, F.*; Kato, Kenichi*; Hattori, Takanori; et al.
Chemistry of Materials, 35(8), p.3249 - 3255, 2023/04
Times Cited Count：1 Percentile：0(Chemistry, Physical)Hydrostatic and chemical pressure are efficient stimuli to alter the crystal structure and are commonly used for tuning electronic and magnetic properties in materials science. However, chemical pressure is difficult to quantify and a clear correspondence between these two types of pressure is still lacking. Here, we study intermetallic candidates for a permanent magnet with a negative thermal expansion (NTE). Based on in situ synchrotron X-ray diffraction, negative chemical pressure is revealed in HoFe on Al doping and quantitatively evaluated by using temperature and pressure dependence of unit cell volume. A combination of magnetization and neutron diffraction measurements also allowed one to compare the effect of chemical pressure on magnetic ordering with that of hydrostatic pressure. Intriguingly, pressure can be used to control suppression and enhancement of NTE. Electronic structure calculations indicate that pressure affected the top of the majority band with respect to the Fermi level, which has implications for the magnetic stability, which in turn plays a critical role in modulating magnetism and NTE. This work presents a good example of understanding the effect of pressure and utilizing it to control properties of functional materials.
Inoue, Rintaro*; Kanaya, Toshiji*; Yamada, Takeshi*; Shibata, Kaoru; Fukao, Koji*
Physical Review E, 97(1), p.012501_1 - 012501_6, 2018/01
Times Cited Count：9 Percentile：62.54(Physics, Fluids & Plasmas)In this study, we investigate the 
process of a polystyrene thin film using inelastic neutron scattering (INS), dielectric relaxation spectroscopy (DRS), and thermal expansion spectroscopy (TES). The DRS and TES measurements exhibited a decrease in glass transition temperature (
) with film thickness. On the other hand, an increase in was observed in INS studies. In order to interpret this contradiction, we investigated the temperature dependence of the peak frequency (
) of the process probed by DRS and TES. The experiments revealed an increase in the peak frequency () with decreasing film thickness in the frequency region. This observation is consistent with the observed decrease in with thickness. The discrepancy between INS and DRS or TES descriptions of the process is likely to be attributed to a decrease in the apparent activation energy with film thickness and reduced mobility, due to the impenetrable wall effect.
Baba, Shinichi; Nemoto, Makoto*; Sozawa, Shizuo; Yamaji, Masatoshi*; Ishihara, Masahiro; Sawa, Kazuhiro
JAERI-Tech 2005-055, 157 Pages, 2005/09
JAERI-Tech-2005-055.pdf:19.06MB
The Japan Atomic Energy Research Institute (JAERI) has been carrying out the research on radiation damage mechanism of heat-resistant ceramics composite materials, as one of the subjects of the innovative basic research on high temperature engineering using the High Temperature Engineering Test Reactor (HTTR). A series of preliminary irradiation tests is being made using the Japan Materials Testing Reactor (JMTR). The present report describes results of post-irradiation examinations so far on specimens irradiated in the second and third capsule, designated 98M-41A and 99M-30A, to fast neutron fluences of 1.0
10
m
(E
1MeV) at temperatures of 973K-1173K and 1273K-1473K. The PIE were conducted as the fundamental statistics index of the diametral dimensions for irradiated specimen, irradiation induced dimensional change rate and thermal expansion rate.
doped with neptuniumSato, Tsuyoshi*; Yamashita, Toshiyuki; Matsui, Tsuneo*
Journal of Nuclear Materials, 344(1-3), p.67 - 72, 2005/09
Times Cited Count：3 Percentile：24.22(Materials Science, Multidisciplinary)Phase relationships between NpO
and CaTiO or Ca(Ti, Al)O were investigated by X-ray diffraction (XRD) analysis, using specimens prepared at 1773 K in Ar-8%H. Single phase solid solutions were formed 0-7.5 mol%Np and 1-10 mol%Np for CaTiO and Ca(Ti, Al)O, respectively. By substituting Al for Ti in CaTiO, Np solubility in Ca(Ti, Al)O increased. Solubility of Np was compared with those of U and Pu, and was discussed with oxidation states and ionic radii of dopants. Thermal expansions of (Ca,Np)TiO were measured from room temperature to 1273 K in Ar-8%H using high-temperature XRD technique. These specimens showed nearly the same value of volumetric thermal expansion coefficients, suggesting that the incorporation of tetravalent Np into CaTiO had practically no effect on stabilization of the crystal lattice. This finding was in a marked contrast to that of Pu doped CaTiO, where pronounced stabilization in the crystal was observed by incorporating Pu into CaTiO.
Baba, Shinichi; Ishihara, Masahiro; Sozawa, Shizuo; Sekino, Hajime
JAERI-Data/Code 2003-003, 394 Pages, 2003/03
JAERI-Data-Code-2003-003.pdf:13.63MB
The research on the radiation damage mechanism of heat resistant ceramic composite materials is one of the research subjects of the innovative basic research in the field of high temperature engineering, using the High Temperature engineering Test Reactor (HTTR). Three series of irradiation tests on the heat resistant ceramic composite materials, first to third irradiation test program, were carried out using the Japan Material Testing Reactor (JMTR). This is a summary report on the the first irradiation test program; irradiation induced dimensional change, thermal expansion coefficient, X-ray diffraction and 
-ray spectrum are reported.
Ishihara, Masahiro; Baba, Shinichi; Hoshiya, Taiji; Shikama, Tatsuo*
Journal of Nuclear Materials, 307-311(Part2), p.1168 - 1172, 2002/12
Times Cited Count：5 Percentile：34.58(Materials Science, Multidisciplinary)no abstracts in English
Nihira, Takeshi*; Iwata, Tadao*; Iwase, Akihiro
JAERI-Research 2001-045, 33 Pages, 2001/11
JAERI-Research-2001-045.pdf:1.27MB
no abstracts in English
Yanagisawa, Kazuaki; Omichi, Toshihiko*; Shirasu, Noriko; Muromura, Tadasumi; *
JAERI-Tech 99-032, 65 Pages, 1999/03
no abstracts in English
Takano, Masahide; Minato, Kazuo; Fukuda, Kosaku; Sato, Seichi*; Ohashi, Hiroshi*
Journal of Nuclear Science and Technology, 35(7), p.485 - 493, 1998/07
Times Cited Count：4 Percentile：38.68(Nuclear Science & Technology)no abstracts in English
CrO
Takano, Masahide; Minato, Kazuo; Fukuda, Kosaku; Sato, Seichi*; Ohashi, Hiroshi*
Journal of Alloys and Compounds, 278, p.277 - 282, 1998/00
Times Cited Count：1 Percentile：19.66(Chemistry, Physical)no abstracts in English
Minato, Kazuo; Takano, Masahide; Fukuda, Kosaku; Sato, Seichi*; Ohashi, Hiroshi*
Journal of Alloys and Compounds, 255, p.18 - 23, 1997/00
Times Cited Count：14 Percentile：66.91(Chemistry, Physical)no abstracts in English
Minato, Kazuo; Takano, Masahide*; Sato, Seichi*; Ohashi, Hiroshi*; Fukuda, Kosaku
Transactions of the American Nuclear Society, 74, p.95 - 96, 1996/00
no abstracts in English
; *; ; Oku, Tatsuo*; ; *
11th Int. Symp. on Carbon New Processing and New Applications; Extended Abstracts,Vol. 1, p.15 - 161, 1990/11
no abstracts in English
*; ; *; *
J.Phys.,C, 19, p.5149 - 5154, 1986/00
no abstracts in English
)H(SO)*; *; ; *
Journal of the Physical Society of Japan, 47(3), p.874 - 877, 1979/00
Times Cited Count：40no abstracts in English
)D(SeO) and isotope effect*; *;
Journal of the Physical Society of Japan, 46(2), p.577 - 580, 1979/00
Times Cited Count：52no abstracts in English
J.Eng.Mater.Technol., 100(2), p.150 - 156, 1978/02
Times Cited Count：2no abstracts in English
S
*;
Journal of the Physical Society of Japan, 38(2), p.400 - 403, 1975/02
Times Cited Count：8no abstracts in English
at -95
CJournal of the Physical Society of Japan, 26(4), p.953 - 956, 1969/00
no abstracts in English
