Author/Authors :
Hervieu، M. نويسنده , , Maignan، A. نويسنده , , Raveau، B. نويسنده , , Michel، C. نويسنده , , Hardy، V. نويسنده , , André، G. نويسنده , , Bourée-Vigneron، F. نويسنده , , Nguyen، N. نويسنده , , Breard، Y. نويسنده , , Ducouret، A. نويسنده ,
Abstract :
The oxycarbonate Sr4Fe2O6CO3 has been revisited, using a new synthesis route. Its microstructure has been established by electron microscopy and evidences an orthorhombic-monoclinic distortion at 220 K. The latter is associated with a spin reorientation (7) visible in magnetic susceptibility, heat capacity, and neutron diffraction studies. To understand the structural transition, particular attention has been paid for the carbonate groups: they adopt a specific orientation within a layer but different in successive layers, which involve disorder along and order in the (a,b) plane and are at the origin of the unusual broadening of the Mossbauer lines.
