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- W2116721770 abstract "Accurate relative and absolute integrated intensities have been measured in an X-ray diffraction experiment on two single crystals of potassium in the temperature range 207 to 337 K. In order to examine the possible significance of anharmonic contributions to the atomic vibrations and the temperature factor, the data were analysed with a fourth-order anharmonic one-particle potential of the form V (u) = ½αu2 + γu4 + δ(u4x + u4y + u4z -- ⅗u4). The isotropic parameter γ and the anisotropic parameter δ were both found to be significant, with respective values averaged from the data from the two crystals of -45 ± 5 eV nm-4 and + 41 ± 5 eV nm-4. The positive sign of δ indicates that there is a greater probability of vibration of the atoms in the nearest-neighbour directions than the next- nearest-neighbour directions. A possible explanation for this in terms of rapid migration of lattice vacancies is suggested. The average value of the harmonic parameter a at 293 K was 15.1 ± 0.3 eV nm-2, from which the root-mean-square vibration amplitude was determined as ur.m.s. = 0.0741 ± 0.0012 nm at 293 K, and the Debye temperature was determined as 81 ± 1 K." @default.
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- W2116721770 date "1982-01-01" @default.
- W2116721770 modified "2023-10-14" @default.
- W2116721770 title "An X-ray diffraction study of potassium" @default.
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- W2116721770 doi "https://doi.org/10.1107/s0567739482000023" @default.
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