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The crystal structure of RuSr 2 GdCu 2 O 8  was successfully refined in the orthorhombic system ( Pbam  space group) using synchrotron powder diffraction data collected on a high purity and low defect containing sample. The microstructures of selected samples submitted to different thermal treatments were investigated by means of TEM analysis: the progressive annealing in an O 2  atmos phere suppresses the formation of nano-domains and extended planar defects, whereas annealing under vacuum favours the formation of extended planar defects and nano-domains as well. Lattice parameters increase with the anneling time, whereas an abrupt decrease of the  c  parameter occurs after de-oxygenation. A dependence of magnetization and superconductivity on the thermal treatment was evidenced and related to the structural and microstructural changes.

Evolution of the structure, microstructure and physical properties of RuSr 2 GdCu 2 O 8 as a function of the thermal treatment