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Study of intergranular phenomena in ceramic oxides


This research proposal has been written to join three research groups in the Materials Science area to carry out research work of common interest. These groups are: the Group of Electroceramics (GE) at the Energy and Nuclear Research Institute, the Group of Complex Oxides (GCO) at the Institute of Physics and the Group of Ceramic Materials (GCM) at the Dept. of Metallurgical Engineering and Materials of the Polytechnic School, all in the University of Sao Paulo campus. These research groups perform research work on processing reactive ceramic powders via chemical routes to produce dense and homogeneous oxides for optimized physical properties. The proposed cooperation for the three groups points to the use of all their available facilities to perform research on some ceramic oxides. The research work at IPEN is mainly on Impedance Spectroscopy of zirconia-based ceramic solid electrolytes; at the Physics Institute' on transport phenomena in manganites, nickelates and cuprates; and at the Polytechnic School on analysis and properties of powders and dispersions of zirconium, aluminum and tin oxides. All three groups carry out experimental research work in most of the following subjects: chemical processing of oxides; the characterization of powder dispersions; sintering studies by XRD, dilatometry and DTA/DSC analyses; and electrical/magnetic characterization. The main common interest, responsible for the elaboration of this research proposal, is the analysis of intergranular phenomena in some oxides (zirconia-based solid electrolytes, tin oxide, rare-earth manganites and superconductor cuprates) by using the Impedance Spectroscopy technique to the study of intergranular components. This research proposal has been written in such a way that all groups will share their experience on: chemical processing of oxides- powder and dispersion analyses, microstructural analyses, and electrical/magnetic characterization. The main purpose of this work is to contribute to the understanding of the following intergranular phenomena: 1) how to minimize the blocking of charge carriers in zirconia-based ionic conducting solid electromes (ZrO2:3 mol% Y203 and ZrO2:9 mol% Y203) in order to increase the total conductivity and consequently the signal/noise ratio in these electrochemical transducers, 2) how to correlate the decrease in the intergranular resistivity to pore exclusion during sintering tin oxide with manganese oxide or iron oxide additions (SnO2:MnO2, Fe203), and 3) how to correlate the variation in intergranular resistivity to the colossal magneto resistance behavior in rare-earth based manganites (Ln1-xMnxOy, Ln=La, Pr, Nd; M=Ca, Sr, Ba),and to the development of Josephson coupling in (Ln2-xTxCu04-y, Ln=Pr, Nd, Sm, Eu;T=Ce, Th, 0

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Scientific publications (31)
(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)
TORIKACHVILI, M. S.; STEIGER, M.; HARDING, L.; BIRD, D.; DILLEY, N. R.; GOMEZ, S.; O'BRIEN, J. R.; JARDIM, R. F.; TAKANO, Y; HERSHFIELD, SP; et al. Pressure study of pure and Rh-doped RuSr2GdCu2O8 magnetic superconductors. MAGNETIC FIELDS IN THE UNIVERSE: FROM LABORATORY AND STARS TO PRIMORDIAL STRUCTURES, v. 850, p. 2-pg., . (99/10798-0)
S. L. M. BRITO; D. GOUVÊA; R. GANZELLA. Comportamento reológico de suspensões aquosas de um sistema varistor à base de ZnO. Cerâmica, v. 53, n. 326, p. 169-174, . (99/10798-0)
DANIEL Z. DE FLORIO; JOSÉ A. VARELA; FABIO C. FONSECA; ELIANA N. S. MUCCILLO; REGINALDO MUCCILLO. Direcionamentos da tecnologia industrial de células a combustível de óxidos sólidos. Química Nova, v. 30, n. 5, p. 1339-1346, . (99/10798-0)
S. K. TADOKORO; E. N. S. MUCCILLO. Zircônia tetragonal policristalina. Parte II: Microestrutura e resistividade elétrica. Cerâmica, v. 47, n. 302, p. 100-108, . (99/10798-0)
R. H. R. CASTRO; D. GOUVÊA. Efeito do vapor d'água na síntese pelo método do precursor polimérico da alumina contendo aditivos. Cerâmica, v. 51, n. 320, p. 408-412, . (99/10798-0, 01/10053-7)
SOUZA‚ JA; YU‚ Y.K.; NEUMEIER‚ JJ; TERASHITA‚ H.; JARDIM‚ RF. Method for analyzing second-order phase transitions: Application to the ferromagnetic transition of a polaronic system. Physical Review Letters, v. 94, n. 20, p. 207209, . (99/10798-0)
CASTRO‚ R.H.R.; PEREIRA‚ G.J.; GOUVÊA‚ D.. Surface modification of SnO2 nanoparticles containing Mg or Fe: Effects on sintering. Applied Surface Science, v. 253, n. 10, p. 4581-4585, . (99/10798-0, 05/55335-0)
ESCOTE‚ MT; MEZA‚ VA; JARDIM‚ RF; BEN-DOR‚ L.; TORIKACHVILI‚ MS; LACERDA‚ AH. Upper critical field of the magnetic superconductor RuGd_ {1.4} Ce_ {0.6} Sr_ {2} Cu_ {2} O_ {10-δ}. Physical Review B, v. 66, n. 14, p. 144503, . (99/10798-0, 00/07362-5)
FONSECA‚ FC; MUCCILLO‚ ENS; MUCCILLO‚ R.. Analysis of the formation of ZrO2: Y2 O3 solid solution by the electrochemical impedance spectroscopy technique. Solid State Ionics, v. 149, n. 3, p. 309-318, . (99/10798-0, 98/14324-0)
S. L. M. BRITO; P. J. B. MARCOS; M. M. HENRIQUE; D. GOUVÊA. Avaliação do comportamento eletrocinético de suspensões cerâmicas não-aquosas contendo PVB como aditivo. Cerâmica, v. 53, n. 325, p. 104-110, . (99/10798-0)
COSTA, G. C. C.; MUCCILLO, R.. Synthesis of lanthanum beta-alumina powders by the polymeric precursor technique. CERAMICS INTERNATIONAL, v. 34, n. 7, p. 1703-1707, . (05/53241-9, 99/10798-0)
FONSECA, F. C.; JARDIM, R. F.; MUCCILLO, R.; MUCCILLO, E. N. S.; GOUVÊA, D.; JUNG, M. H.; LACERDA, A. H.; SOUZA, J. A.. Transport properties of La0.6Y0.1Ca0.3MnO3 compounds with different interfaces. Journal of the European Ceramic Society, v. 24, n. 6, p. 1271-1275, . (99/10798-0)
PEREIRA, G. J.; FLORIO, D. Z. DE; MUCCILLO, E. N. S.; GOUVÊA, DOUGLAS; CASTRO, RICARDO HAUCH RIBEIRO DE. Densification and electrical conductivity of fast fired manganese-doped ceria ceramics. Materials Letters, v. 59, n. 10, p. 1195-1199, . (01/10053-7, 99/10798-0)
PEREIRA‚ G.J.; CASTRO‚ R.H.R.; HIDALGO‚ P.; GOUVÊA‚ D.. Surface segregation of additives on SnO< sub> 2 based powders and their relationship with macroscopic properties. Applied Surface Science, v. 195, n. 1, p. 277-283, . (99/10798-0)
R. H. R. CASTRO; D. GOUVÊA. Efeito do íon Mn como aditivo na transição de fase g ®a da alumina. Cerâmica, v. 49, n. 309, p. 55-60, . (99/10798-0, 01/10053-7)
SOUZA‚ JA; JARDIM‚ RF. Magnetoresistivity in the clustered state of La_ {0.7- x} Y_ {x} Ca_ {0.3} MnO_ {3} manganites. Physical Review B, v. 71, n. 5, p. 054404, . (99/10798-0)
MUCCILLO‚ ENS; ROCHA‚ RA; MUCCILLO‚ R.. Preparation of Gd< sub> 2 O< sub> 3-doped ZrO< sub> 2 by polymeric precursor techniques. Materials Letters, v. 53, n. 4, p. 353-358, . (99/10798-0)
CASTRO‚ R.H.R.; HIDALGO‚ P.; MUCCILLO‚ R.; GOUVÊA‚ D.. Microstructure and structure of NiO-SnO< sub> 2 and Fe< sub> 2 O< sub> 3-SnO< sub> 2 systems. Applied Surface Science, v. 214, n. 1, p. 172-177, . (99/10798-0, 01/10053-7)
ESCOTE, M. T.; PONTES, F. M.; LEITE, E. R.; LONGO, E.. High oxygen-pressure annealing effects on the ferroelectric and structural properties of PbZr0.3Ti0.7O3 thin films. Journal of Applied Physics, v. 96, n. 4, p. 2186-2191, . (99/10798-0)
FLORIO, DANIEL ZANETTI DE; MUCCILLO, REGINALDO; ESPOSITO, VINCENZO; DI BARTOLOMEO, ELISABETTA; TRAVERSA, ENRICO. Preparation and electrochemical characterization of Perovskite/YSZ ceramic films. Journal of the Electrochemical Society, v. 152, n. 1, p. A88-A92, . (99/10798-0)
FLORIO, DANIEL ZANETTI DE; MUCCILLO, R.. Effect of boron oxide on the cubic-to-monoclinic phase transition in yttria-stabilized zirconia. Materials Research Bulletin, v. 39, n. 10, p. 1539-1548, . (99/10798-0, 98/14324-0)
V. A. MEZA; X. GRATENS; R. F. JARDIM; L. BEN-DOR. Preparation and general physical properties of polycrystalline PrBa2Cu3O7-y obtained from sol-gel precursors. Brazilian Journal of Physics, v. 32, n. 3, p. 731-738, . (99/10798-0, 98/11522-6, 00/07362-5)
FONSECA‚ FC; GOYA‚ GF; JARDIM‚ RF; MUCCILLO‚ R.; CARRENO‚ NLV; LONGO‚ E.; LEITE‚ ER. Superparamagnetism and magnetic properties of Ni nanoparticles embedded in SiO_ {2}. Physical Review B, v. 66, n. 10, p. 104406, . (99/10798-0, 98/14324-0)
MUCCILLO‚ ENS; ÁVILA‚ DM. Impedance spectroscopy of tetragonal zirconia polycrystals doped with ceria. Materials Letters, v. 56, n. 4, p. 454-459, . (99/10798-0)
ESCOTE‚ MT; PONTES‚ FM; LEITE‚ ER; VARELA‚ JA; JARDIM‚ RF; LONGO‚ E.. Microstructural and transport properties of LaNiO3- δ films grown on Si (111) by chemical solution deposition. Thin Solid Films, v. 445, n. 1, p. 54-58, . (99/10798-0)
CARNEIRO‚ A.S.; JARDIM‚ RF; FONSECA‚ FC. Current localization and Joule self-heating effects in Cr-doped Nd_ {0.5} Ca_ {0.5} MnO_ {3} manganites. Physical Review B, v. 73, n. 1, p. 012410, . (99/10798-0)
DA COSTA, G. C. C.; MUCCILLO, R.; SALGADO, L; FILHO, FA. Synthesis of lanthanum beta alumina by the polymeric precursor technique. Materials Science Forum, v. 530-531, p. 2-pg., . (98/14324-0, 99/10798-0)
COSENTINO, I. C.; VICHI, F. M.; MUCCILLO, E. N. S.; MUCCILLO, R.; SALGADO, L; FILHO, FA. Synthesis and characterization of nanosized ZrTiO4 powders prepared by the sol-gel method. Materials Science Forum, v. 530-531, p. 2-pg., . (98/14324-0, 99/10798-0)
CAPRONI, E.; MUCCILLO, R.; SALGADO, L; FILHO, FA. Preparation and characterization of zirconia-yttria/zirconia-magnesia composites. Materials Science Forum, v. 530-531, p. 2-pg., . (98/14324-0, 99/10798-0)

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