Citrate sol-gel method for the preparation of β/β′'-alumina

Yoo, Jong-Seok; Han, Yang‐Su; Kim, Yoon-Ho

doi:10.1016/0167-577x(93)90169-x

Cited by 19 publications

(6 citation statements)

References 10 publications

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“…In addition to the abovementioned attempts to optimize the preparation of BASE, a variety of approaches have been developed, including but not limited to the sol–gel process, 388–390 co-precipitation technique, 391 spray-freeze/freeze-drying method, 392,393 microwave heating, 374,394 and mechanochemical methods, 395 though little effect was observed on the enhancement of ion conduction.…”

Section: Oxide-based Isesmentioning

confidence: 99%

Recent progress and strategic perspectives of inorganic solid electrolytes: fundamentals, modifications, and applications in sodium metal batteries

Huang

et al. 2023

Chem. Soc. Rev.

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Section: Oxide-based Isesmentioning

confidence: 99%

Recent progress and strategic perspectives of inorganic solid electrolytes: fundamentals, modifications, and applications in sodium metal batteries

Huang

et al. 2023

Chem. Soc. Rev.

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“…Extensive research has been carried out in recent years to develop techniques aiming to synthesize compositions in the Na 2 O–Al 2 O 3 system at a low temperature, thus avoiding long durations of holding at a high calcination temperature. Sol–gel processing, 2–4 alkoxide hydrolysis, 5 and coprecipitation 6 are among a few techniques towards these attempts. Another method, i.e.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Structural Characterization of a Metastable Mullite‐Like Alumina Phase

Subasri

Roy

Matusch

et al. 2005

Journal of the American Ceramic Society

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A solution combustion technique for the synthesis of different b-alumina compositions in the Na 2 O . xAl 2 O 3 system (where x 5 5, 6, or 7) is described along with the structural characterization of the materials prepared. The amorphous powder obtained after a combustion reaction between the nitrate salts of the cations and aminoacetic acid was calcined in air at different temperatures in the range from 6001C up to 13001C. The phases were investigated by powder X-ray diffraction (XRD) and infrared spectroscopic measurements. A metastable mullite-like alumina phase was found to form as an intermediate at a minimum calcination temperature of 7501C and stable up to 10001C, which transformed completely into b/b 00 -alumina phases beyond a temperature of 11001C. The crystal structure of the mullite-like alumina phase was deduced by rietveld refinement of slow scan powder XRD data. A better understanding of the crystal structure of the mullite-like alumina was possible using other supplementary experimental evidences.

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“…Os pós de beta-alumina podem ser sintetizados por reação convencional em estado sólido [12,28,40,44], sol-gel [25,[45][46][47][48], microondas [49,50], técnica de co-precipitação [4], spray-freeze-drying [4], dentre outras [28,51] As vantagens da corrente elétrica na sinterização incluem aumento da taxa de sinterização, redução da temperatura, períodos mais curtos de sinterização, menor crescimento do tamanho de partícula e propriedades melhoradas em relação à técnica convencional [2].…”

Section: Síntese Da Beta-aluminaunclassified

“…Comparada à reação em estado sólido, a reação em solução oferece várias vantagens: (i) produção de pós com grande homogeneidade e, assim, produtos finais com alto grau de pureza; e (ii) obtenção de pós com elevada área de superfície específica que podem ser sinterizados a temperaturas relativamente baixas[4,47,48,51].…”

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“…Proporções molares utilizadas no preparo dos pós-cerâmicos.Figura 23. Procedimento executado para o preparo do pó precursor de beta-alumina.Na literatura, relatos da temperatura de transformação de fase da betaalumina variam entre 1100°C e 1200°C[4,40,43,[45][46][47][48]51,[88][89][90]. Sendo assim, para garantir a temperatura necessária para a transição de fase, todos os pós precursores com diferentes concentrações mostrados na Tabela 1 foram submetidos a queima a temperatura de 1250°C pelo período de 5 horas.…”

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Sinterização flash do condutor catiônico beta-alumina sintetizada pelo método dos precursores poliméricos.

Caliman¹

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Sodium beta-alumina is a Na + ions conductor ceramic used as solid electrolyte in sodium batteries for energy storage in solar and eolic plants. Due to its high content of sodium, this material is instable at high temperatures and can suffer decomposition during conventional sintering (high temperatures for long periods of time). Flash sintering is an electric current activated sintering technique which promotes the densification of ceramic powder compacts in a few seconds at significantly lower temperatures than conventional sintering. Since in flash sintering the electric current flows through the sample, the flash sintering of any conductor material seems to be reasonable. Nevertheless, up to this date all published papers concern flash sintering of oxygen vacancies conductors or semiconductors , materials which are compatible with platinum (Pt) electrodes. In this work the flash sintering of the cationic conductor betaalumina was studied. Beta-alumina was synthetized by the polymeric precursors method, characterized and then it was submitted to flash sintering. Platinum electrode was shown to be a blocking electrode for beta-alumina. Flash sintering success was determined by the change in electrode's material to silver (Ag), which made possible the reversible electrochemical reaction at the electrode-electrolyte interfaces and preserved chemical composition and morphology after flash. Due to this electrolyte metastability, atmosphere had to be changed in order to preserve the chemical composition of an alkali-rich (Na +) material such as beta-alumina. The flash sintering of a cationic conductor is shown for the first time in the literature and highlights the relevance of electrode reaction, which is a limiting point to the success of a flash sintering and needs to be well studied and adapted to each type of material.

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Citrate sol-gel method for the preparation of β/β′'-alumina

Cited by 19 publications

References 10 publications

Recent progress and strategic perspectives of inorganic solid electrolytes: fundamentals, modifications, and applications in sodium metal batteries

Recent progress and strategic perspectives of inorganic solid electrolytes: fundamentals, modifications, and applications in sodium metal batteries

Synthesis and Structural Characterization of a Metastable Mullite‐Like Alumina Phase

Sinterização flash do condutor catiônico beta-alumina sintetizada pelo método dos precursores poliméricos.

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