Bruno, J. C. [UNESP]Cavalheiro, A. A. [UNESP]Zaghete, M. A. [UNESP]Cilense, M. [UNESP]Varela, José Arana [UNESP]2014-05-272014-05-272005-12-01Materials Science Forum, v. 498-499, p. 642-647.0255-5476http://hdl.handle.net/11449/68606The complex perovskite compound 0.9PbMg 1/3Nb 2/3O 3-0.1PbTiO 3 is one of the most promising relaxor ceramic because the addition of lead titanate increases T m, by about 5°C/mol% from intrinsic T m value for pure PMN (near -7 to -15°C). A Ti-modified columbite precursor was used to prepare PMN-PT powders containing single perovskite phase. This variation on columbite route includes Ti insertion in MgNb 2O 6 orthorhombic structure so that individual PT synthesis becomes unnecessary. Furthermore, effects of Li additive on columbite and PMN-PT structures were studied by XRD to verify the phase formation at each processing step. XRD data were also used for the structural refinement by Rietveld method. The additive acts increasing columbite powders crystallinity, and the amount of perovskite phase was insignificantly decreased by lithium addition. By SEM micrographs it was observed that Li presence in PMN-PT powders leads to the formation of rounded primary particles and for lmol% of additive, the grain size is not changed, different from when this concentration is enhanced to 2mol%.642-647engCeramicsChemical synthesisColumbite and rietveld methodPMN-PTOrthorhombic structurePerovskite phaseAddition reactionsCeramic materialsPerovskiteRietveld methodSynthesis (chemical)Powder metalsSynthesis and characterization of 0.9PMN-0.1PT powders by the use of a modified columbite precursorTrabalho apresentado em evento10.4028/www.scientific.net/MSF.498-499.642WOS:000233984500105Acesso aberto2-s2.0-338472171539128353103083394