Structural properties of β-FeSi 2 bulk crystal grown by horizontal gradient freeze method

H. Kakemoto*, Y. Tsai, A. C. Beye, H. Katsumata, S. Sakuragi, Y. Makita, A. Obara, Naoto Kobayashi, H. Shibata, S. Uekusa, T. Tsukamoto, T. Tsunoda, Y. Imai

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contribution

8 Citations (Scopus)

Abstract

We report on the synthesis of β-FeSi 2 bulk materials using Horizontal Gradient Freeze (HGF) method. Chunk and powder FeSi 2 or high-purity Fe (4N) and Si (9N) were used as starting materials. Three values (1:2, 2:5 and 1:3) of the Fe:Si ratio were selected in the very narrow α and β ranges of the equilibrium phase diagram. Samples were melted between 1300°C and 1500°C in high purity graphite crucibles covered with boron nitride. After cooling, the samples were kept at 800°C and 900°C during 66 to 100 hours, leading to transformation from α to β phase. Cooling rate and annealing time were taken as the two main parameters to optimize the growth conditions. Principal structural characterization was made by X-ray diffraction (XRD). Correlation with stoichiometry was achieved using the results of Rutherford Backscattering Spectroscopy (RBS) and Electron Probe X-Ray Micro Analysis (EPXMA). The samples obtained from 1:2 ratio exhibited mainly β phase while the 2:5 ratio specimens revealed almost α phase structure. The samples prepared with 1:3 ratio was found as a mixture of α and β phases under Si-rich conditions.

Original languageEnglish
Title of host publicationMaterials Research Society Symposium - Proceedings
PublisherMaterials Research Society
Pages331-336
Number of pages6
Volume402
Publication statusPublished - 1996
Externally publishedYes
EventProceedings of the 1995 MRS Fall Symposium - Boston, MA, USA
Duration: 1995 Nov 271995 Nov 30

Other

OtherProceedings of the 1995 MRS Fall Symposium
CityBoston, MA, USA
Period95/11/2795/11/30

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials

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