Retention of high dielectric constant sodium beta alumina via solution combustion: Role of aluminum ions complexation with fuel

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dc.contributor.authorGupta, B.
dc.contributor.authorPujar, P.
dc.contributor.authorMal, S.S.
dc.contributor.authorGupta, D.
dc.contributor.authorMandal, S.
dc.date.accessioned2026-02-05T09:31:36Z
dc.date.issued2018
dc.description.abstractIn the present study, solution combustion technique has been explored to synthesize Sodium ?-alumina (SBA; NaAl<inf>11</inf>O<inf>17</inf>) powder and thin films. Three fuels namely urea, glycine and citric acid have been used to seek the feasibility of synthesizing crystalline SBA powder at low temperature. Also, the effect of nature of fuels used as well as calcination treatment on phase evolution and morphology of the as-combusted powder was investigated. Thermal analysis and X-ray diffraction studies suggest the formation of crystalline SBA powder at temperature as low as 259 °C, using urea in the combustion reaction whereas other fuels resulted in amorphous SBA phase and this variation in phase was found due to difference in exothermicity of the fuel used. Thermodynamic and spectroscopic analyses showed that the exothermicity of fuel depends on various factors like (i) standard heat of formation of fuel and (ii) the complexation offered by fuel to metal cations. Furthermore, sodium ?-alumina thin film capacitor (metal-insulator-metal) was also fabricated using urea via spray combustion synthesis. The sodium ?-alumina thin film showed a high dielectric value (?<inf>r</inf>) of ~21. © 2017 Elsevier Ltd and Techna Group S.r.l.
dc.identifier.citationCeramics International, 2018, 44, 2, pp. 1500-1511
dc.identifier.issn2728842
dc.identifier.urihttps://doi.org/10.1016/j.ceramint.2017.10.061
dc.identifier.urihttps://idr.nitk.ac.in/handle/123456789/25278
dc.publisherElsevier Ltd
dc.subjectAlumina
dc.subjectAluminum compounds
dc.subjectAmino acids
dc.subjectCapacitors
dc.subjectCombustion
dc.subjectCombustion synthesis
dc.subjectCrystalline materials
dc.subjectFilm capacitor
dc.subjectMetabolism
dc.subjectMetal insulator boundaries
dc.subjectNitrogen compounds
dc.subjectOptical films
dc.subjectOxygen sensors
dc.subjectPermittivity
dc.subjectPowder metals
dc.subjectSodium compounds
dc.subjectSpectroscopic analysis
dc.subjectTemperature
dc.subjectThermoanalysis
dc.subjectThin films
dc.subjectUrea
dc.subjectX ray diffraction
dc.subjectCalcination treatment
dc.subjectCombustion reactions
dc.subjectHeat of formation
dc.subjectHigh dielectric constants
dc.subjectMetal insulator metals
dc.subjectSolution combustion
dc.subjectSolution combustion technique
dc.subjectX-ray diffraction studies
dc.subjectFuels
dc.titleRetention of high dielectric constant sodium beta alumina via solution combustion: Role of aluminum ions complexation with fuel

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