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Magnetization and magnetic anisotropy of R2Co14B and Nd2(Fe1−x Cox)14B measured on single crystals (1987)

Hirosawa, S. ; Tokuhara, K. ; Yamamoto, H. ; [et al.]

[S.l.] : American Institute of Physics (AIP)

Journal of Applied Physics 61 (1987), S. 3571-3573

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ISSN: 1089-7550

Source: AIP Digital Archive

Topics: Physics

Notes: Magnetization and anisotropy field of R2Co14B with R being La, Nd, and Gd and of Nd2(Fe1−xCox)14B have been measured on single-crystal specimens. The cobalt sublattice has a planar anisotropy: K1=−1.30 MJ/m3 at 4.2 K for La2Co14B with the [110] direction being the room-temperature easy direction of magnetization. The rare-earth ions in R2Co14B experience a smaller exchange field than in R2Fe14B, which results in a rapid reduction of the rare-earth sublattice magnetization and anisotropy with increasing temperature. Because of the planar anisotropy of cobalt and the weaker R-Co interactions than R-Fe, the anisotropy field of Nd2(Fe1−xCox)14B turns out to be almost independent of the cobalt concentration in a temperature range between 300 and 500 K.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1063/1.338729

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The structure of water and methanol adsorbed on silica gel by FT-NIR spectroscopy (1988)

Yamauchi, H. ; Kondo, S.

Springer

Colloid & polymer science 266 (1988), S. 855-861

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ISSN: 1435-1536

Keywords: Adsorption ; silica gels ; water structure ; NIR spectroscopy ; methanol

Source: Springer Online Journal Archives 1860-2000

Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics

Notes: Abstract The NIR adsorption spectra were analyzed quantitatively on the fundamental, combination and first overtone region of OH vibrations of silanol groups, water and methanol adsorbed on mesoporous silica gels. Adsorbed methanol constitutes first layer of about 3 molecules/um−2 and second layer, the structure of which is similar to that of bulk methanol liquid. Adsorbed water consists of a first layer of about 3 molecules/nm−2, the second layer of about 9 molecules/nm−2 and the third layer has a structure similar to the that of bulk water. The molecular configuration at the interface is discussed.