Formation of Amorphous Graded Structure in Bi3Pb7 Intermetallic Compounds under Strong Gravitational Field

Tsutomu Mashimo; Yusuke Iguchi; Rabaya Bagum; Tomokazu Sano; S. Takeda; S. Kimura; Osamu Sakata; Masao Ono; Satoru Okayasu; T. Tsurui; K. Hiraga

doi:10.4028/www.scientific.net/DDF.289-292.357

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HomeDefect and Diffusion ForumDefect and Diffusion Forum Vols. 289-292Formation of Amorphous Graded Structure in Bi3Pb7...

Formation of Amorphous Graded Structure in Bi₃Pb₇ Intermetallic Compounds under Strong Gravitational Field

Abstract:

A visible four-layers structure with anomalous nano-sturucture was formed from a homogeneous -phase Bi3Pb7 intermetallic compound under a strong gravitational field (1.02x106 G, 130°C, 100 hours). In the 4th layer (lowest-gravity region), pure Bi particles precipitate. In the 2nd 3rd layers, composition graded structures, where Pb content increased along the gravity direction, were formed. It was found that the very broad XRD peak appeared in the 2nd layer, which indicated that an amorphous structure was contained.