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| Hauptseite > Publikationsdatenbank > Pressure-driven Phase Transition in CaFeAsF at 40 and 300 K > print |
| Hauptseite > Publikationsdatenbank > Pressure-driven Phase Transition in CaFeAsF at 40 and 300 K > print |
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| 100 | 1 | _ | |a Mishra, S. K. |0 P:(DE-HGF)0 |b 0 |e Corresponding author |
| 245 | _ | _ | |a Pressure-driven Phase Transition in CaFeAsF at 40 and 300 K |
| 260 | _ | _ | |a Bristol |c 2012 |b IOP Publ. |
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| 520 | _ | _ | |a We carried out systematic investigation of high pressure crystal structure and structural phase transition upto 46 GPa at 40 K and 25 GPa at 300 K in CaFeAsF using powder synchrotron x-ray diffraction experiments. Rietveld analysis of the diffraction data at 40 K reveals a structural phase transition from an orthorhombic to a monoclinic phase at Pc = 13.7 GPa, while increasing pressure. The transition to a lower symmetry phase (orthorhombic to monoclinic) in this 1111 compound under pressure is in contrast with the transition to a high symmetry phase (orthorhombic to tetragonal) as observed in the '122' type compounds. On heating from 40 K at high pressure, CaFeAsF undergoes a monoclinic to tetragonal phase transition around 25 GPa and 200 K. Further, it does not show any post-tetragonal phase transition, as observed in '122' compounds (CaFe2As2, BaFe2As2), and remains in the tetragonal phase upto 25 GPa at 300 K. The dPc/dT slope is found to be positive for CaFeAsF and CaFe2As2, unlike a negative gradient was found in case of BaFe2As2. |
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