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Comportamento elétrico a alta temperatura de termistor cerâmico alfa-Fe2O3 com coeficiente de temperatura negativo
(Associação Brasileira de Cerâmica, 2008-12-01)
O comportamento elétrico da cerâmica densa de α-Fe2O3, sintetizada pelo método Pechini, foi investigado por espectroscopia de impedância na faixa de freqüência de 5 Hz a 13 MHz. As medidas foram realizadas entre 298 K e ...
Efeito da adição simultânea de sementes e dopantes na microestrutura e propriedade dielétrica da cerâmica 0,93 PZN - 0,07 BT
(Associação Brasileira de Cerâmica, 2000-03-01)
O método de Pechini bem como o uso da adição simultânea de partículas sementes e solução dopante de BaTiO3 foram usados para preparar o Niobato de chumbo e zinco (PZN). Os pós calcinados a 800 ° C/2 h e 900 ° C/1 h, os ...
Preparation of 9/65/35 PLZT thin films deposited by a dip-coating process
(Elsevier B.V., 2001-09-01)
Crack-free polycrystalline PLZT (Pb,a)(Zr,Ti)O-3 thin films with the perovskite structure were prepared by dir-coating using the Pechinis process. Lead acetate, hydrated lanthanum carbonate, zirconium n-propoxide and ...
High sinterability of Ca-PZT, synthesized by polymeric and partial oxalate process
(Kluwer Academic Publ, 2001-02-01)
This study includes Ca-PZT in the morphotropic phase boundary, MPB process combining the Pechini method, (ZT) and the Partial oxalate method (Ca-PZT) by obtaining single phase particles of ZT phase with a high specific ...
Influence of thickness on crystallization and properties of LiNbO3 thin films
(Elsevier B.V., 2003-03-01)
Thin films of lithium niobate were deposited on Pt/Ti/SiO2 (111) substrates by spin coating from the polymeric precursor method (Pechini process). Annealing in static air was performed at 500 degreesC for 3 h. The obtained ...
Influence of oxygen atmosphere on crystallization and properties of LiNbO3 thin films
(Elsevier B.V., 2004-01-01)
Thin films of lithium niobate were deposited on the Pt/Ti/SiO2 (111) substrates by spin coating from the polymeric precursor method (Pechini process). Annealing in static air and oxygen atmosphere was performed at 500 ...
Influence of viscosity and ionic concentration on morphology of PLZT thin films
(Elsevier B.V., 2001-03-01)
PLZT thin films were prepared by a dip-coating process using Pechini's method. The PLZT solution was obtained from the mixture of the cation solutions. The viscosity of the solution was adjusted in the range of 20-40 cP, ...
Effect of la doping on the crystal structure, electric, magnetic and morphologic properties of the BSCCO system
(2017-10-01)
Studies of the doping process can provide a better understanding of the superconducting mechanisms in cuprous oxide materials. In this work, we studied the doping effects on the crystal structure, electric, morphologic and ...
Effect of viscosity and temperature on the microstructure of BBT thin films
(ABM, ABC, ABPol, 2003-06)
Thin films of BBT were deposited on silicate and Pt/Ti /SiO2 (111) substrates by spin- coating from the polymeric precursor method (Pechini process). The obtained films were characterized by optical microscopy, X-ray ...
Multi-layered LiNbO3 films prepared by a polymeric precursor method
(Elsevier B.V., 2001-01-01)
The polymeric precursor method was used to prepare multi-layered LiNbO3 films. The overall process consists of preparing a coating solution from the Pechini process and the deposited film is subsequently heat-treated. ...