Experimental and Theoretical Study of the Structural, Magnetic and Eledronic Properties oftheBa,GdSbO, Perovskite

In this work the procedure to the synthesis of Ba,GdSb0 6 complex perovskite by the solid-state reaction method is reported. Theoretically a study of the crystalline and electronic structure was performed into theframework of the Density Functional Theory (DFT). The most stable structure is obtained to be a rhombohedral peravskite with a lattice constanta 6.0840A. Due the occurrence of a mean energy gap of2,84 eV close to the Fermi /eve/for both up and down spin polarizations this material is classifies as insulator. The effective magnetic moment of material obtained from the calculations was 7,0 JlB- The crystalline structure was analyzed through the X-ray diffraction technique and Rietveld refinement of the experimental data. Results are strongly in agreement with those theoretically predicted. Magnetic response was studied from measurements of magnetic susceptibility as afunction of temperature. Results reveal the paramagnetic feature of this material in the temperature regime from 50 K up to 300 K. From the fitting with the Curie law the effective magnetic moment was obtained to be 8,1 JliJo which is slightly higher that the theoretical valuefor the Gd3+ isolated cation predicted by the theory of paramagnetism. The energy gap obtainedfrom experiments of dijfose reflectance is relatively in agreement with the theoretical predictions. The dielectric constant as afimction of appliedfrequencies at room temperature was measured. Results reveal a decreasing behavior with a high value of dielectric constant at low applied frequencies.