| Autor: |
Bessas, D., Fukui, H., Sugimoto, K., Glazyrin, K., Sergueev, I., Levchenko, G., Dukhnenko, A., Filipov, V., Isnard, O., Ishikawa, D., Yoshikawa, H., Sakata, O., Baron, A. Q. R. |
| Předmět: |
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| Zdroj: |
Journal of Applied Physics; 7/14/2021, Vol. 130 Issue 2, p1-9, 9p |
| Abstrakt: |
A combined microscopic, i.e., powder and single crystal x-ray diffraction and inelastic x-ray scattering, and macroscopic, i.e., heat capacity, characterization was carried out on YB 66 between 10 and 400 K. The system crystallizes in a rather large unit cell with a lattice parameter of about 23.4 Å at room temperature. The volume thermal expansion coefficient is found to be 3.9 × 10 − 5 K − 1 at 295 K. A high Debye temperature above 1000 K was determined using several methods, 1043 (25) K , from heat capacity measurements, 1430 (59) K , from elastic constants measurements, and 1690 (198) K , from thermal expansion measurements. The thermal transport is modeled as a collection of Einstein oscillators with an Einstein temperature of 194 (2) K. The C 11 and C 44 elastic constants are above 400 and 150 GPa , respectively. The average speed of sound in YB 66 is estimated to be 9631 (380) m / s , similar to the average speed of sound in corundum, 10 000 m / s. The large volume of the unit cell and the stiffness of the crystal structure make YB 66 a promising candidate for high-resolution x-ray monochromatization applications. Candidate reflections for high-resolution resonant inelastic x-ray scattering are indicated and potential pitfalls relevant to the quality of crystals and multi-beam cases are mentioned. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
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