Surface modification of pre-sintered BaTiO3 particles

Völtzke, D.; Abicht, Hans‐Peter; Woltersdorf, J.; Pippel, Eckhard

doi:10.1016/s0254-0584(01)00389-3

Cited by 15 publications

(10 citation statements)

References 9 publications

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“…Another possibility to enhance densification is impurities in the starting materials, which could decrease the liquid formation temperature [22]; the same starting powder was used for all experiments in the present study and only high purity chemicals (acid, base) and deionized water were employed, which should rule out impurities in explaining observed differences between the powders treated under different pH conditions. Densification (based on the elimination of pores) at 1300 8C for the powder conditioned at pH 3 is attributed to the enhanced sliding effect, as this sample conforms to the simple core-shell structure discussed by Abicht and co-workers [10,20]. The pronounced grain growth and densification exhibited by the sample conditioned at pH 10 must be attributed to the presence of the Ba-rich outer shell and/or the multi-shell structure itself, since the overall Ba/Ti ratio is probably close to stoichiometric (i.e.…”

Section: Resultssupporting

confidence: 75%

“…It has been proposed by Abicht and co-workers [10,20] that the amorphous TiO 2 surface phase formed on acid-conditioned BaTiO 3 promotes densification below the eutectic temperature of the pseudo-binary BaTiO 3 -Ba 6 Ti 17 O 40 system (1332 8C) [21], by facilitating the sliding of individual BaTiO 3 grains. Another possibility to enhance densification is impurities in the starting materials, which could decrease the liquid formation temperature [22]; the same starting powder was used for all experiments in the present study and only high purity chemicals (acid, base) and deionized water were employed, which should rule out impurities in explaining observed differences between the powders treated under different pH conditions.…”

Section: Resultsmentioning

confidence: 99%

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Microstructure and permittivity of sintered BaTiO3: influence of particle surface chemistry in an aqueous medium

Lee

Paik

Hackley

et al. 2004

Materials Research Bulletin

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Section: Resultssupporting

confidence: 75%

Section: Resultsmentioning

confidence: 99%

Microstructure and permittivity of sintered BaTiO3: influence of particle surface chemistry in an aqueous medium

Lee

Paik

Hackley

et al. 2004

Materials Research Bulletin

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“…Foi demonstrada uma série de caracterizações deste carbonato residual como contaminante de superfície e segunda fase, além de distintas possibilidades para sua eliminação e a influência nas características do pó titanato de bário [14][15][16][17].…”

Section: Caracterização Superficial De Nanopartículas De Batio 3 Prepunclassified

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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“…15 The use of dispersing agents to achieve a desired suspension rheology that facilitates subsequent processing is considered a better way to produce high-quality, high-performance, reliable ceramic products. However, polymer surfactants have been mainly used to modify single-phase ceramic powders [16][17][18][19][20] and have rarely been reported in conjunction with multiphase ceramic powders (nanocomposite ceramic powders).…”

Section: Introductionmentioning

confidence: 99%

Improved performance of diatomite-based dental nanocomposite ceramics using layer-by-layer assembly

Lü

Xia²,

Liu³

et al. 2012

IJN

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Abstract:To fabricate high-strength diatomite-based ceramics for dental applications, the layer-by-layer technique was used to coat diatomite particles with cationic [poly(allylamine hydrochloride)] and anionic [poly(sodium 4-styrenesulfonate)] polymers to improve the dispersion and adsorption of positively charged nano-ZrO 2 (zirconia) as a reinforcing agent. The modified diatomite particles had reduced particle size, narrower size distribution, and were well dispersed, with good adsorption of nano-ZrO 2 . To determine the optimum addition levels for nano-ZrO 2 , ceramics containing 0, 20, 25, 30, and 35 wt% nano-ZrO 2 were sintered and characterized by the three-point bending test and microhardness test. In addition to scanning electron microscopy, propagation phase-contrast synchrotron X-ray microtomography was used to examine the internal structure of the ceramics. The addition of 30 wt% nano-ZrO 2 resulted in the highest flexural strength and fracture toughness with reduced porosity. Shear bond strength between the core and veneer of our diatomite ceramics and the most widely used dental ceramics were compared; the shear bond strength value for the diatomite-based ceramics was found to be significantly higher than for other groups (P , 0.05). Our results show that diatomite-based nanocomposite ceramics are good potential candidates for ceramic-based dental materials.

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Surface modification of pre-sintered BaTiO3 particles

Cited by 15 publications

References 9 publications

Microstructure and permittivity of sintered BaTiO3: influence of particle surface chemistry in an aqueous medium

Microstructure and permittivity of sintered BaTiO3: influence of particle surface chemistry in an aqueous medium

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

Improved performance of diatomite-based dental nanocomposite ceramics using layer-by-layer assembly

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