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

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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    Kakemoto, H., Tsai, Y., Beye, A. C., Katsumata, H., Sakuragi, S., Makita, Y., Obara, A., Kobayashi, N., Shibata, H., Uekusa, S., Tsukamoto, T., Tsunoda, T., & Imai, Y. (1996). Structural properties of β-FeSi 2 bulk crystal grown by horizontal gradient freeze method In Materials Research Society Symposium - Proceedings (Vol. 402, pp. 331-336). Materials Research Society.