| 1. |
- Olsen, J. Staun, et al.
(author)
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High-pressure structural behavior of the double perovskite Sr2CrReO6 : an experimental and theoretical study
- 2009
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In: High Pressure Research. - : Informa UK Limited. - 0895-7959 .- 1477-2299. ; 29:1, s. 83-86
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Journal article (peer-reviewed)abstract
- The high-pressure structural behavior of Sr2CrReO6 has been studied experimentally using synchrotron radiation and the diamond anvil cell and theoretically using density functional theory. The experimental zero-pressure bulk modulus is B0=1704GPa and the pressure derivative is B0'=4.71.0. These results compare well with the calculated values 172.6GPa and 5.7. A pseudo-cubic unit cell can describe the crystal structure at low pressure, but the tetragonal structure becomes evident at high pressure.
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| 2. |
- Gatt, Rafael, 1960, et al.
(author)
-
Pressure effect in the Hg-based superconductors: A structural study
- 1998
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In: Physical Review B. - 2469-9969 .- 2469-9950. ; 57:21, s. 13922-13928
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Journal article (peer-reviewed)abstract
- Energy-dispersive synchrotron x-ray-diffraction studies were performed on powder samples of Hg1212 and Hg1223 in a diamond-anvil cell at pressure up to 300 kbar. High compressibility was found. A reversible structural transition was observed, which is suggested to correspond to a pressure-induced ordering along the c axis. The accommodation of the Ba ion at high pressure is studied, and the effect it might have on the electronic structure of these materials is discussed by employing results from cluster calculations.
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| 3. |
- Jiang, J. Z., et al.
(author)
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Compressibility and thermal expansion of cubic silicon nitride
- 2002
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In: Physical Review B (Condensed Matter). - 0163-1829. ; 65:16, s. 1612021-1612024
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Journal article (peer-reviewed)abstract
- The compressibility and thermal expansion of the cubic silicon nitride (c-Si3N4) phase have been investigated by performing in situ x-ray powder-diffraction measurements using synchrotron radiation, complemented with computer simulations by means of first-principles calculations. The bulk compressibility of the c-Si3N4 phase originates from the average of both Si-N tetrahedral and octahedral compressibilities where the octahedral polyhedra are less compressible than the tetrahedral ones. The origin of the unit cell expansion is revealed to be due to the increase of the octahedral Si-N and N-N bond lengths with temperature, while the lengths for the tetrahedral Si-N and N-N bonds remain almost unchanged in the temperature range 295-1075 K.
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| 4. |
- Staun Olsen, J., et al.
(author)
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High pressure studies up to 50 GPa of Bi-based high-Tc superconductors
- 1991
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In: Physica Scripta. - : IOP Publishing. - 0031-8949 .- 1402-4896. ; 44:2, s. 211-213
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Journal article (peer-reviewed)abstract
- The high-Tc superconductor with nominal composition BiSrCaCu2Ox has been studied at high pressure, i.e. up to 50 GPa. A tetragonal structure was compatible with the measurements at all pressures, and no phase change was observed. The bulk modulus, B0 = 62.5 GPa, obtained has a somewhat smaller value than the one estimated earlier.
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