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000837905 1001_ $$0P:(DE-HGF)0$$aMishra, S. K.$$b0$$eCorresponding author
000837905 245__ $$aPressure-driven Phase Transition in CaFeAsF at 40 and 300 K
000837905 260__ $$aBristol$$bIOP Publ.$$c2012
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000837905 520__ $$aWe carried out systematic investigation of high pressure crystal structure and structural phase transition upto 46 GPa at 40 K and 25 GPa at 300 K in CaFeAsF using powder synchrotron x-ray diffraction experiments. Rietveld analysis of the diffraction data at 40 K reveals a structural phase transition from an orthorhombic to a monoclinic phase at Pc = 13.7 GPa, while increasing pressure. The transition to a lower symmetry phase (orthorhombic to monoclinic) in this 1111 compound under pressure is in contrast with the transition to a high symmetry phase (orthorhombic to tetragonal) as observed in the '122' type compounds. On heating from 40 K at high pressure, CaFeAsF undergoes a monoclinic to tetragonal phase transition around 25 GPa and 200 K. Further, it does not show any post-tetragonal phase transition, as observed in '122' compounds (CaFe2As2, BaFe2As2), and remains in the tetragonal phase upto 25 GPa at 300 K. The dPc/dT slope is found to be positive for CaFeAsF and CaFe2As2, unlike a negative gradient was found in case of BaFe2As2.
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000837905 7001_ $$0P:(DE-HGF)0$$aMittal, R.$$b1
000837905 7001_ $$0P:(DE-HGF)0$$aChaplot, S. L.$$b2
000837905 7001_ $$0P:(DE-HGF)0$$aOvsyannikov, S. V.$$b3
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000837905 7001_ $$0P:(DE-HGF)0$$aDubrovinsky, L.$$b5
000837905 7001_ $$0P:(DE-Juel1)130991$$aSu, Y.$$b6
000837905 7001_ $$0P:(DE-HGF)0$$aMatsuishi, S.$$b7
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000837905 7001_ $$0P:(DE-Juel1)130572$$aBrückel, Thomas$$b10
000837905 773__ $$0PERI:(DE-600)2166409-2$$a10.1088/1742-6596/377/1/012034$$gVol. 377, p. 012034 -$$p012034 -$$tJournal of physics / Conference Series$$v377$$x1742-6596$$y2012
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