Low-temperature synthesis of β-aluminas by a sol-gel technique

Jayaraman, V.; Gnanasekaran, T.; Periaswami, G.

doi:10.1016/s0167-577x(96)00193-0

Cited by 43 publications

(28 citation statements)

References 4 publications

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“…Sodium loss and exaggerated grains growth are inevitable in this method with the synthesis temperature of above 1600 1C, which results in lower β″-alumina content with poor conductivity and duplex microstructure with large grains [6]. In order to decrease the synthesis temperature, optimize microstructure and quality of products, soft-chemistry methods have been employed, such as alkoxide hydrolysis [7,8], sol-gel processing [9,10], co-precipitation [11], solution combustion technique [12] and electrophoretic deposition [13]. However, β-alumina cannot be eliminated completely from the final products by this method which leads to difficulties for the large-scale industrial production.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and characterization of Y2O3 doped Na–β″-Al2O3 solid electrolyte by double zeta process

Jiang

et al. 2015

Ceramics International

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Section: Introductionmentioning

confidence: 99%

Synthesis and characterization of Y2O3 doped Na–β″-Al2O3 solid electrolyte by double zeta process

Jiang

et al. 2015

Ceramics International

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“…Another issue that must be taken into consideration is that the FTIR spectra were normalized using the broad absorption band at about 3430 cm − 1 as reference. As mentioned before, this band is ascribed to products derived from aluminum alkoxide hydrolysis and hydroxyl groups present on the surface of pseudo-boehmite and boehmite [15][16][17]. It is well established that the precursor hydrolysis is related to the solvent type and sol temperature.…”

Section: Discussionmentioning

confidence: 71%

“…1. The broad absorption band around 3430 cm − 1 is due to products derived from aluminum alkoxide hydrolysis and hydroxyl groups present on the surface of pseudo-boehmite and boehmite [15][16][17]. The bands at 3020 cm − 1 and 2930 cm − 1 are ascribed to asymmetric and symmetric stretching vibrations of CH 3 and CH 2 groups, respectively [18].…”

Section: Ftirmentioning

confidence: 99%

AES and FTIR characterization of sol–gel alumina films

Vasconcelos

Nunes

Vasconcelos

2012

Journal of Non-Crystalline Solids

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In this work we obtained sol-gel alumina coatings on AISI 304 stainless steel substrates. Alumina sols were prepared by using aluminum isopropoxide (AI) as precursor, acetic acid (HOAc) as catalyst, ethanol (C 2 H 5 OH) or isopropanol (C 3 H 8 O) as solvent, and water. The as-prepared solutions were deposited on stainless steel substrates by means of the dip-coating technique. The obtained composites were characterized by Fourier transform infrared spectroscopy (FTIR) and Auger electron spectroscopy (AES). We observed that the concentration of Al\O type bonds in the obtained alumina coatings depends on the solvent type used, temperature and peptization state of the sol, withdrawal speed, and number of dipping cycles. AES experiments showed that the interface formed between the alumina coating and substrate surface is in general formed by several layers of different chemical compositions.

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“…Several procedures have reported the synthesis of different alumina nanomaterial phases such as precipitation [17], spray pyrolysis [18], sol-gel reactions [19], methods utilizing different surfactants as a template [20], formation of solid precursors of aluminum hydroxides or oxyhydroxides with various compositions, and crystallinity [21]. The aim of this article is to investigate the preparation of nano-alumina by a novel solution combustion method using a complex and without using fuel.…”

Section: Introductionmentioning

confidence: 99%

Solution combustion synthesis using Schiff-base aluminum complex without fuel and optical property investigations of alumina nanoparticles

Salehi

Arabsarhangi

2015

Int Nano Lett

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Synthesis of alumina nanomaterials via a solution combustion technique using Schiff base aluminum (III) complex at 820 and 950°C for 4 h was performed successfully. The synthesis procedure was performed using the complex in the absence and presence of urea and glycine as fuel for comparison. The obtained data showed that the procedure without using fuel resulted in a better phase and morphology. To investigate the phase formation, powder X-ray diffraction technique was used. Also, SEM micrographs were used to investigate the morphology of the obtained materials. The optical properties of the obtained materials were studied by FTIR spectra. According to the PXRD data, it was found that with annealing at 950°C, the phase formation of the obtained materials showed cubic crystal structure with cell parameter a = 3.14 Å for gamma phase. Also, by annealing at 820°C using fuels for 4 h, the main phase was found to be in gamma.

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Low-temperature synthesis of β-aluminas by a sol-gel technique

Cited by 43 publications

References 4 publications

Synthesis and characterization of Y2O3 doped Na–β″-Al2O3 solid electrolyte by double zeta process

Synthesis and characterization of Y2O3 doped Na–β″-Al2O3 solid electrolyte by double zeta process

AES and FTIR characterization of sol–gel alumina films

Solution combustion synthesis using Schiff-base aluminum complex without fuel and optical property investigations of alumina nanoparticles

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