In this work we report the synthesis and structural characterization of the elpasolite Cs2NaTbCl6, belonging to the space group Fm3m. The synthesis is by solid state reaction, in controlled atmosphere. By means of thermal analysis (DTA/TGA), the best crystallization temperatures were obtained: 772.2 °C for 2 hours. Structural studies are carried out by means of DRX-powder diffraction and application of the Rietveld profiles refinement method, for the 32 diffraction lines analyzed. The following crystallographic parameters are obtained: a0=10.7636 (Å), Z=4, M=660.44, V=1247.0 (Å)3, Dx=3.519, and Dexp=3.52±0.01.
Tetragonal, perovskite type, powders and thin films of PbTiO3 have been synthesized by the sol-gel method, using trihydrate lead acetate and titanium tetraisopropoxide as starting alkoxides. The thermal treatment has been established from differential thermal and thermogravimetric analysis. An interpretation is presented for the various processes occurring during the gel to dense oxide conversion. The optimal process towards thin films includes annealing stages at 180, 400 and 650°C. Thin films were prepared by spinning on Si and Pt-covered Si. By SEM analysis the films appear cracked, porous, or homogeneous, with 0.5 to 1 um per solution coating. Current-voltage characteristics of Al/PT/Pt/Si capacitors exhibit a resistivity of 0.5 to 20·108Ωm, nondestructive breakdown in the range of 4 to over 20V, and relative dielectric permittivity of 100.
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