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High-precision parallel-beam X-ray system for high-temperature diffraction studies

  • Toru Mitsunaga (a1), Mari Saigo (a1) and Go Fujinawa (a1)

Abstract

A recently developed Rigaku parallel-beam X-ray diffraction system equipped with a parabolic graded-multilayer mirror in the incident beam and a parallel-slits analyzer in the diffracted beam was used for precision high-temperature diffraction studies. The lattice parameters a and c of α-Al2O3 at room temperature and up to 1473 K were determined with precision in the range of 0.6–7.3×10−5. The thermal expansion coefficients for a and c agreed with literature values to better than 3%. The system was used successfully also to determine the Debye characteristic temperature of Si and to study structural phase transition of LaCoO3 from rhombohedral at room temperature to cubic at 1700 K.

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Caroline, H. M., and Gerard, D. R. (1962). International Tables for X-Ray Crystallography, pp. 232–236.
Fujunawa, G., and Sasaki, A. (2000). “Development of a high-resolution and high-accuracy parallel beam powder diffractometer using laboratory X-ray sources,” Adv. X-Ray Chem. Anal., Jpn. XBNSDA 31, 1127. axc, XBNSDA
Kobayashi, Y., Mitsunaga, T., Fujinawa, G., Arii, T., Sumerake, M., Asai, K., and Harada, J. (2000). “Structural phase transition from rhombohedral to cubic in LaCoO3,J. Phys. Soc. Jpn. JUPSAU 69, 34683469. jup, JUPSAU
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Keywords

High-precision parallel-beam X-ray system for high-temperature diffraction studies

  • Toru Mitsunaga (a1), Mari Saigo (a1) and Go Fujinawa (a1)

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