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Precise measurement of the lattice parameters of α‐Al 2 O 3 in the temperature range 4.5–250 K using the Mössbauer wavelength standard
Author(s) -
Lucht M.,
Lerche M.,
Wille H.C.,
Shvyd'ko Yu. V.,
Rüter H. D.,
Gerdau E.,
Becker P.
Publication year - 2003
Publication title -
journal of applied crystallography
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.429
H-Index - 162
ISSN - 1600-5767
DOI - 10.1107/s0021889803011051
Subject(s) - thermal expansion , atmospheric temperature range , wavelength , debye model , lattice (music) , mössbauer spectroscopy , lattice constant , materials science , analytical chemistry (journal) , chemistry , condensed matter physics , optics , physics , thermodynamics , crystallography , diffraction , optoelectronics , chromatography , acoustics , metallurgy
The lattice parameters of α‐Al 2 O 3 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 Mössbauer wavelength standard, i.e. the wavelength λ M = 86.025474 (16) pm of the nuclear resonance radiation of 57 Fe (Shvyd'ko et al. , 2000), which has previously been applied successfully to measure the lattice parameters of α‐Al 2 O 3 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.