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2 1998

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Magnetization and structure of Fe-Al powders.

Fujii M., Saito K., Wakayama K., Kawasaki M., Yoshioka T., Isshiki T., Nishio K., Shiojiri M.

Inżynieria Materiałowa

1998

R. XIX, nr 4

860-863

A few micrometers-sized Fe1-xAlx (x=0.35-0.42) powders prepared by atomizing method have the B2 structure and are paramegnetic. The powder milled for several hours is magnetized and has a spontaneous magnetization as great as 100 emu/g. The milled powder particles become flakes, which are composed of lamellae expanding parallel to the (110) plane and having heavily distorted lattice. High-resolution transmission electron microscopy and electron diffraction revealed that structures appear in very thin areas within the lamellae. These superlattices indicate the creation of large number of antiphase boundaries, which induce ferromagnetism. When the milled powder is heated at 100-400 degrees centigrade the magnetization decreases to a few tens emu/g, the lamella structures being kept.

New specimen preparation methods for materials transmission electron microscopy using ion-milling

Kawasaki M., Yoshioka T., Shiojiri M.

Electron Technology

1998

Vol. 31, No. 2

183-188

Three mew preparation methods of specimen for transmission electron microscopy (TEM) applicable to materials characterization have developed using ion milling. One is an ion-digging method, where diamond powder particles are dispersed on the surface of specimen such as multilayer heterostructure and then the specimen are bombarded gy Ar ions perpendicular to its surface. Narrow poles with a diamond particle at the top form by ion digging, and can be observed in the surface profile by TEM. This method does not need the adhesion of two sliced substances and the mechanical polishing, which are troublesome pre-treatments used in conventional method. The others are preparation methods of selactions of powder particles, using photo-resistor Ni(P) elestroless plating for embedding the particles. These methods allow high-resolution TEM observations of micrometr-sized particles.