Single crystal growth, structure refinement, ferroelastic domains and phase transitions of the hausmannite CuCr2O4

Article Article scientifique Article Single crystal growth, structure refinement, ferroelastic domains and phase transitions of the hausmannite CuCr2O4 eng 1994 author Ye Zuo-Guang 24139 author Crottaz Olivier 29419 author Vaudano François 42275 author Kubel Frank 22398 author Tissot Paul 25052 author Schmid Hans 25307 103-118 10.1080/00150199408245096 0015-0193 With a view to studying the optical, structural and magnetoelec. properties, single crystals of the hausmannite CuCr2O4 were grown by a high temp. soln. method, based on the thermal decompn. of K2Cr2O7 in the presence of CuO. X-ray powder refinements at room temp. indicate that the crystal structure of CuCr2O4 can be accurately described by the centrosym. space group I41/amd. Crystal cuts were examd. by polarized light microscopy in reflection, revealing ferroelastic domain structures consistent with the tetragonal symmetry. The phase transitions in the Cu chromite were studied both by in situ optical domain observations and by DTA and DSC measurements. The ferroelastic phase transition from the tetragonal to the cubic phase was found to take place at 853 K and to be of 1st order. The magnetic phase transition was revealed by a DSC peak at 157 K with a small enthalpy of 0.2 J/g. Crystallog. data and at. coordinates are given. Copper chromite Single crystal growth Crystal structure Ferroelastic domains Structural and magnetic phase transition Dewey 540 Swiss National Science Foundation 1993 CH 40 Département de chimie minérale, analytique et appliquée 145 false Ferroelectrics 162 1-4 e0899ee4-24c6-4f1f-91bd-04cc2a1d8ff6 Article (Published version) Public 158).pdf 1894020 application/pdf openAccess Faculté des sciences / Section de chimie et biochimie / Département de chimie minérale, analytique et appliquée

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Single crystal growth, structure refinement, ferroelastic domains and phase transitions of the hausmannite CuCr₂O₄	Ferroelectrics			1994	884	961

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Vaudano, François