Hydrothermal synthesis of nanostructured zirconia materials: Present state and future prospects

Piticescu, Radu Robert; Monty, C.; Millers, D.

doi:10.1016/j.snb.2005.03.092

Cited by 46 publications

(21 citation statements)

References 10 publications

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“…Owing to these properties, the acidic mixed oxides play an important role in applications such as the cyclization of citronellal to isopulegol 16,17 , isomerization of α-pinene and dehydration of 4-methyl-2-pentanol 18 , Fischer-Tropsch process 19 , ammonia oxidation 20 , hydrogenation of alkenes 21 , synthesis of alcohols 22 , and biodiesel production 23 . Among the most frequently employed methods for the synthesis of mixed oxides are the coprecipitation 24 , hydrothermal routes 25 , sonochemical processes 26 , the oxalate route 27 , and the sol-gel process 28 . From all these processes, the sol-gel process (SGP) has attracted attention due to its versatility in the development of new materials, owing to the simplicity and flexibility of the synthesis, which permits the preparation of highly pure and homogeneous products with controlled porosity 29 .…”

Section: Introductionmentioning

confidence: 99%

Synthesis and characterization of novel ZrO2-SiO2 mixed oxides

2014

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In this study the mixed oxides ZrO 2 -SiO 2 , were synthesized by the sol-gel method with a molar ratio of 95:5 (Si/metal) and characterized by X-ray diffraction, absorption-desorption of N 2 , Fourier transform infrared spectroscopy, thermal gravimetric analysis, temperature-programmed desorption of ammonia, and acidity test by titration. The synthesized materials, which are amorphous to X-rays, are composed of a mixture of micro-and mesopores. They show a higher acid strength than the separate oxides, indicating that the ZrO 2 is highly dispersed in the silica matrix.

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Section: Introductionmentioning

confidence: 99%

Synthesis and characterization of novel ZrO2-SiO2 mixed oxides

2014

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“…Eh-pH diagrams show the stability region for the different stable ionic and nonionic species in aqueous solutions. The information is displayed as a plot of pH versus electrochemical potential, and it can be used as a simple resort to estimate phase equilibrium during the hydrothermal processes [23,[106][107].…”

Section: Resultsmentioning

confidence: 99%

“…In fact, in addition to precursor phase preparation, pure and well crystallized materials can be synthesized directly by hydrothermal reactions, thus avoiding further thermal treatments (i.e., hydrothermal crystallization) [19][20][21][22][23]. This characteristic offers the possibility to obtain submicrometric and even nanometric or nanostructured materials [2,24].…”

Section: Introductionmentioning

confidence: 99%

Synthesis of advanced ceramics by hydrothermal crystallization and modified related methods

Ortíz-Landeros¹,

Gómez-Yáñez²,

López-Juárez³

et al. 2012

J Adv Ceram

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Abstract:The present article aims to give a brief overview about the advantages of the hydrothermal crystallization method for the synthesis of advanced ceramics. Emphasis is given, not only on the conventional hydrothermal crystallization, but also on some of its variants; such as ultrasound-assisted, electrochemical-assisted, microwave-assisted and surfactant-assisted hydrothermal methods which open up new opportunities for the synthesis of ceramic materials with novel properties demanded for advanced applications. In the current work the synthesis of barium titanate (BaTiO 3 ), lithium metasilicate (Li 2 SiO 3 ) and sodium-potassium niobate (Na, K)NbO 3 powders are reported as cases of study.

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“…The samples were obtained via a hydrothermal process performed in a 5-litter Teflon-linen 5 Berghoff autoclave at 200°C for 2 h using ammonia for complete precipitation of the doped oxide. The synthesis procedure is similar to that described in our previous paper [16] and the temperature and pH were selected based on these previous results and thermodynamic predictions using HSC Chemistry 8 software, with an initial Zr 4+ ionic concentration of 0.1 M. While the yttria concentration was maintained constant in every sample at 3 mol.%, the addition of ceria was set to 3, 6 and 9 mol.%. Figure 1 shows the predicted 2 have been selected for preliminary FAST sintering tests.…”

Section: Experimental Procedures 21 Powder Preparationmentioning

confidence: 99%

Thermal stability and field assisted sintering of cerium-doped YSZ ceramic nanoparticles obtained via a hydrothermal process

et al. 2017

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Abstract. Owing to its extraordinary range of properties, yttria-doped zirconia holds a unique place among the ceramic oxide systems. To improve the properties for some specific custom design applications, co-doping with other rare earth oxides such as ceria is needed. The aim of this paper is to identify the correlations between the phase composition evolution with increasing thermal treatment temperature in order to establish the thermal stability in connection with the ceria content and how does it influence the yttria-stabilised zirconia microstructure. The ZrO 2 -3Y 2 O 3 -nCeO 2 (n = 3, 6 and 9 wt.%) samples were obtained by a hydrothermal process and submitted to a thermal treatment up to 1600°C. Intensive characterization was performed via X-ray powder diffraction and EDX analysis. It was found that up to 400°C, a monophasic structure was formed. At higher temperatures tetragonal zirconia is formed as a major phase with the presence of secondary monoclinic and cubic phases, depending on the Ce content and thermal treatment temperature. Sintered compacts with densities up to 99.5% from the theoretical density were obtained starting from the 6%CeO 2 -3%Y 2 O 3 -ZrO 2 -nanostructured powders using a special field-assisted (FAST) sintering process. With increasing CeO 2 content to 9% only, tetragonal zirconia with 6-9 nm crystallite sizes is formed during the FAST sintering process.

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Hydrothermal synthesis of nanostructured zirconia materials: Present state and future prospects

Cited by 46 publications

References 10 publications

Synthesis and characterization of novel ZrO2-SiO2 mixed oxides

Synthesis and characterization of novel ZrO2-SiO2 mixed oxides

Synthesis of advanced ceramics by hydrothermal crystallization and modified related methods

Thermal stability and field assisted sintering of cerium-doped YSZ ceramic nanoparticles obtained via a hydrothermal process

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