Synthesis of ultrafine BaTiO3 particles from polymeric precursor: their structure and surface property

Cho, Woo–Seok; Hamada, Etsuo

doi:10.1016/s0925-8388(97)00446-5

Cited by 51 publications

(24 citation statements)

References 18 publications

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“…7 Chemical synthesis has grown up through techniques of sol-gel, coprecipitation, hydrothermal and polymeric precursor method. 8 The advantage of chemical methods is the quasiatomic dispersion of constituent components in liquid precursor, which facilitates synthesis of crystallized powder with submicron particles and high purity at low temperatures. The advantage of Pechini method (polymeric precursor method) is based on the fact of its simplicity and possibility to hold the initial stoichiometry.…”

Section: Introductionmentioning

confidence: 99%

The characterization of the barium titanate ceramic powders prepared by the Pechini type reaction route and mechanically assisted synthesis

Lazarević¹,

Vijatović²,

Dohčević‐Mitrović³

et al. 2010

Journal of the European Ceramic Society

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Section: Introductionmentioning

confidence: 99%

The characterization of the barium titanate ceramic powders prepared by the Pechini type reaction route and mechanically assisted synthesis

Lazarević¹,

Vijatović²,

Dohčević‐Mitrović³

et al. 2010

Journal of the European Ceramic Society

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“…O procedimento da mistura e a proporção utilizada foi similar à reportada [21][22][23], tendo como principal dificuldade nesta etapa a solubilidade do isopropóxido de titânio. A solubilização total do precursor de Ti foi possível adicionandose lentamente ao etileno glicol sob agitação a 90 °C por 30 min, onde se formou uma solução inicialmente translúcida, que começa a ficar turva supostamente com a precipitação de algum composto de Ti.…”

Section: Materiais E Métodosunclassified

Caracterização superficial de nanopartículas de BaTiO3 preparado pelo método dos precursores poliméricos

Brito¹,

Gouvêa²

2010

Cerâmica

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ResumoA síntese de nanopartículas e a sua caracterização têm sido a grande mola propulsora do desenvolvimento de materiais nanoestruturados. Pouca atenção tem sido dedicada aos fenômenos físico-químicos relacionados às enormes superfícies intrínsecas destes materiais. Dentre eles, o titanato de bário ocupa uma posição de destaque devido ao seu grande potencial na geração de produtos de alta tecnologia. Neste estudo o BaTiO 3 foi sintetizado pelo método dos precursores poliméricos, que proporciona a geração de nanopartículas de grande uniformidade química. Contudo, o uso de cátions que formam carbonatos de alta estabilidade pode inviabilizar o uso do método. Os pós de titanato de bário preparados apresentaram elevada área de superfície específica, porém com formação de fases parasitas de carbonato de bário e carbonatos adsorvidos na superfície do titanato de bário. O estudo da química de superfície utilizando métodos como espectroscopia de infravermelho e análises eletrocinéticas permitiu a caracterização deste contaminante e demonstraram indícios de condições específicas de dissolução do carbonato de bário, que podem possibilitar a descontaminação do titanato de bário. Palavras-chave: titanato de bário, nanopartículas, método dos precursores poliméricos, análises eletrocinéticas. Abstract The advance in new nanostructured materials technology is promoted by the development of new synthesis and characterization methods. The attention on the enormous specific surface area intrinsically associated to this material family and specifically on the physical-chemistry properties has been underestimated. BaTiO 3 is an important material for producing ferroelectric ceramicsand special attention is focused on the large potential offered by the properties of nanoparticles of this oxide. Our work proposes the understanding of the surface properties of BaTiO 3 nanoparticles prepared by the polymeric precursor method. We dedicated a particular attention to the carbonates species formed during the polymeric precursor pyrolysis on the powder surface for which characterization was done by DRIFT and dynamic electrophoretic mobility. The powder synthesis and the structure were investigated by X-ray diffraction, thermal analysis and electron microscopy. The simultaneous analysis by dynamic electrophoretic mobility and DRIFT versus pH carbonated shows that it is possible to eliminate the carbonate species adsorbed onto the powder surface.

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“…Uchino et al [19] reported that BaTiO 3 revealed a drastic decrease of the Curie temperature around a particle size of 120 nm and that the crystal symmetry was cubic even at room temperature. While Cho and Hamada [20] indicated the presence of cubic BaTiO 3 with 20 nm in size at room temperature, and it was assumed that a sufficiently small crystallite size might lead thermodynamically to the disappearance of the tetragonal structure. The prepared BaTiO 3 , with an average size of 43.7 nm and stably exists as cubic structure at room temperature, shows good agreement with the published works.…”

Section: Crystal Structuresmentioning

confidence: 99%

Magnetic and dielectric properties of barium titanate-coated barium ferrite

Wang

Han

et al. 2009

Journal of Alloys and Compounds

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Synthesis of ultrafine BaTiO3 particles from polymeric precursor: their structure and surface property

Cited by 51 publications

References 18 publications

The characterization of the barium titanate ceramic powders prepared by the Pechini type reaction route and mechanically assisted synthesis

The characterization of the barium titanate ceramic powders prepared by the Pechini type reaction route and mechanically assisted synthesis

Caracterização superficial de nanopartículas de BaTiO3 preparado pelo método dos precursores poliméricos

Magnetic and dielectric properties of barium titanate-coated barium ferrite

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