Journal ArticleDOI
Precise measurement of the lattice parameters of α-Al2O3 in the temperature range 4.5–250 K using the Mössbauer wavelength standard
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In this article, the lattice parameters of α-Al2O3 have been measured in a temperature range from 4.5 to 250 K with a relative accuracy of better than 6 × 10−6.Abstract:
The lattice parameters of α-Al2O3 have been measured in a temperature range from 4.5 to 250 K with a relative accuracy of better than 6 × 10−6. The experimental method uses Bragg backscattering and the recently proposed Mossbauer wavelength standard, i.e. the wavelength λM = 86.025474 (16) pm of the nuclear resonance radiation of 57Fe (Shvyd'ko et al., 2000), which has previously been applied successfully to measure the lattice parameters of α-Al2O3 at temperatures between 286 and 374 K (Shvyd'ko et al., 2002). The experimental data in the range from 4.5 to 374 K are consistent with the Debye model of thermal expansion. At 4.5 K, the thermal expansion coefficient is as low as 1.2 (9) × 10−10 K−1 in the a direction.read more
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Properties of Sapphire
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Journal ArticleDOI
Thermal expansion of AlN, sapphire, and silicon
W. M. Yim,R. J. Paff +1 more
TL;DR: In this article, the thermal expansion coefficients of high-purity AlN, sapphire, and silicon were calculated from the data obtained with precision high-temperature x-ray lattice parameter measurements.
Journal ArticleDOI
Accurate structure analysis with synchrotron radiation. The electron density in Al2O3 and Cu2O
A. Kirfel,K. Eichhorn +1 more
TL;DR: In this paper, an accurate room-temperature structure analysis of cuprite, Cu2O, and corundum, α-Al2O3 using synchrotron radiation was carried out to assess the accuracy of single-crystal X-ray diffraction data that can be obtained with such a source.
Journal ArticleDOI
Use of synchrotron radiation in X‐ray diffraction topography
T. Tuomi,K. Naukkarinen,P. Rabe +2 more
TL;DR: In this article, the relative integrated intensities of different orders of reflections were calculated and calculated values of extinction distances were used to estimate the image width of a dislocation whose Burgers vector could be determined.