Zobrazeno 1 - 10
of 48
pro vyhledávání: '"Masao Kiyama"'
Autor:
Masao Kiyama
Publikováno v:
Journal of the Japan Society of Powder and Powder Metallurgy. 42:690-694
The conditions had been studied for the formation of ferromagnetic precipitates of MxFe3-xO4 (M = divalent metal ion, such as Fe2+, Zn2+, Co2+or Mn2+), BaFe12O19 and SrFe12O19 in the presence of aqueos media. We succeeded in preparing the needlelike
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::63c8a60dce3c130f306f900c05dbc119
https://doi.org/10.2497/jjspm.42.690
https://doi.org/10.2497/jjspm.42.690
Publikováno v:
Hyperfine Interactions. 92:1311-1315
Fine particles of β-FeO(OH) were prepared using the56Fe isotope and the surfaces of the particles were coated with extremely thin57Fe(III) layers. Mossbauer results show that the Fe(III) ions in the top surface layer are involved in the magnetic ord
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::813b0fc0a472c722853e955fa3404997
https://doi.org/10.1007/bf02065772
https://doi.org/10.1007/bf02065772
Publikováno v:
Journal of the Physical Society of Japan. 63:176-183
Fine particles of α-FeO(OH) and β-FeO(OH) were prepared using 56 Fe isotope and the surfaces of the particles were coated with extremely thin 57 Fe(III) layers. Mossbauer results show that the Fe(III) ions in the top surface layer are involved in t
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::f4ac7a3385dc6c4544a5a112c91ddb22
https://doi.org/10.1143/jpsj.63.176
https://doi.org/10.1143/jpsj.63.176
Publikováno v:
Journal of Solid State Chemistry. 99:329-335
Platelike particles of BaFe 12 O 19 with epitaxially grown Fe 3 O 4 overlayers,6 x Fe 3 O 4 (1 − x )Ba Fe 12 O 19 , were prepared by a wet method. The structure was characterized by X-ray diffraction and TEM and SEM observations. Magnetic propertie
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::ff2c5fabc32c081bc22a207b7c4aae78
https://doi.org/10.1016/0022-4596(92)90321-l
https://doi.org/10.1016/0022-4596(92)90321-l
Publikováno v:
Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms. 76:202-203
Surface magnetic properties of α-FeOOH were investigated by means of 57Fe Mossbauer absorption spectroscopy. α-FeOOH fine particles were prepared using pure 57Fe isotope and the surfaces of the particles were coated with extremely thin 57Fe(III) la
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::d2abd693adf06f8e983783433b111dd9
https://doi.org/10.1016/0168-583x(93)95180-d
https://doi.org/10.1016/0168-583x(93)95180-d
Publikováno v:
NIPPON KAGAKU KAISHI. :24-27
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::cdccd2cdd7652fdd6d803d566d976980
https://doi.org/10.1246/nikkashi.1980.24
https://doi.org/10.1246/nikkashi.1980.24
Autor:
Masao Kiyama
Publikováno v:
Bulletin of the Chemical Society of Japan. 51:134-138
Manganese and cobalt ferrites were prepared by the air oxidation of aqueous suspension of Fe(OH)2 and either Mn(OH)2 or Co(OH)2 at 50–80 °C. In alkaline suspensions, all the metal ions are transformed into spinel ferrites, MxFe3−xO4 (M=Mn or Co)
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::91bad9a3d766ac29795a56587c302943
https://doi.org/10.1246/bcsj.51.134
https://doi.org/10.1246/bcsj.51.134
Autor:
Naoichi Yamamoto, Jun Takada, Yoshinari Mimura, Hitoshi Kitaguchi, Yoichi Tomii, Yoshio Oka, Akiyoshi Osaka, Masao Kiyama
Publikováno v:
Journal of the Japan Society of Powder and Powder Metallurgy. 34:590-596
The oxalate coprecipitation method was applied to the preparation of high-Tc superconducting oxide powder. The process of forming the oxide through the pyrolysis and subsequent heat treatment was studied in connection with powder characterization. Th
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::a22f4834bc14d252553679b20658f67b
https://doi.org/10.2497/jjspm.34.590
https://doi.org/10.2497/jjspm.34.590
Autor:
Jun Takada, Naoichi Yamamoto, Masao Kiyama, Y. Miura, Hitoshi Kitaguchi, Yoichi Tomii, Akiyoshi Osaka, Teruyoshi Unesaki, Yoshio Oka
Publikováno v:
Journal of the Japan Society of Powder and Powder Metallurgy. 34:651-658
High-Tc superconductor YBa2Cu3Ox(x ≈ 6.8) reacts upon water to decompose. In order to clarify the process of decomposition, the microstructure of the YBC ceramics was studied by means of X-ray diffraction and EPMA after the reaction with water unde
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::5e79abd998ff17ee490dc92b72be4484
https://doi.org/10.2497/jjspm.34.651
https://doi.org/10.2497/jjspm.34.651
Autor:
Masao Kiyama
Publikováno v:
Bulletin of the Chemical Society of Japan. 47:1646-1650
The optimum conditions were studied for the formation of Fe3O4 by the air oxidation of Fe(OH)2. The suspensions obtained by mixing NaOH and FeSO4 solutions in various values of R(=2NaOH/FeSO4) were subjected to oxidation with air at various temperatu
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::84768569754627192a4a660df3643537
https://doi.org/10.1246/bcsj.47.1646
https://doi.org/10.1246/bcsj.47.1646