Combustion synthesis of Sr0.5Ba0.5Nb2O6 and effect of fuel on its microstructure and dielectric properties

Patro, P.K.; Kulkarni, Ajit R.; Harendranath, C.S.

doi:10.1016/s0025-5408(02)01025-5

Cited by 34 publications

(23 citation statements)

References 24 publications

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“…The observed dielectric constants of the CASP glass-doped SBN50 ceramics are very larger than the reported values (ε max ≈ 1611) for SBN50 synthesized by partial co-precipitation and combustion synthesis [15,13].…”

Section: Dielectric Propertiescontrasting

confidence: 72%

Effect of CASP glass doping on sintering and dielectric properties of SBN ceramics

Chen

2009

Journal of Alloys and Compounds

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Section: Dielectric Propertiescontrasting

confidence: 72%

Effect of CASP glass doping on sintering and dielectric properties of SBN ceramics

Chen

2009

Journal of Alloys and Compounds

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“…NH 3 and H 2 O 2 (Qualigen), oxalic acid (Loba, 99% ) were used as the starting material. The precursor, Nb-oxalate was prepared as described elsewhere [18]. The coprecipitation reaction was carried out by drop wise addition of aqueous solution of a mixture of Sr(NO 3 ) 2 and Ba(NO 3 ) 2 from one burette and Nb-oxalate from another burette into a round bottomed flask containing excess ammonium hydroxide as precipitant.…”

Section: Methodsmentioning

confidence: 99%

“…A number of wet chemical methods have also been implemented to synthesize SBN. Some of which are sol gel [13,14], hydrolysis aging [15], EDTA complex chemical route [16], partial coprecipitation [17] and solution combustion [18] method. Coprecipitation method, a wet chemical method for synthesizing ceramic materials, is known to result in high homogeneity, fine grainsized materials.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Sr0.5Ba0.5Nb2O6 by Coprecipitation Method?Dielectric and Microstructural Characteristics

et al. 2004

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Sr 0.5 Ba 0.5 Nb 2 O 6 (SBN50) has been synthesized by coprecipitation method using Sr(NO 3 ) 2 , Ba(NO 3 ) 2 and Nb-oxalate as precursors and ammonium hydroxide as precipitant. Calcination at 1150 • C resulted in pure SBN50 phase (XRD) and nano powder with size varying between 100-250 nm (TEM). The average grain size (SEM) in the sintered pellets ranged from 2.5 to 5 µm as the sintering temperature varied from 1250 to 1350 • C. The maximum sintered density was observed to be 93% of ρ th . The plot of dielectric constant vs. temperature clearly showed a shift of dielectric maxima (ε max ) with frequency, indicating the relaxor nature of SBN50. The room temperature dielectric constant (ε RT > 2300) observed for all these samples is higher compared to the earlier reported values (ε RT ∼ 1500). The T c (for 1 KHz) varied from 47-60 • C depending on the sintering conditions. The hystersis loops were recorded at various temperatures. The maximum saturation polarization for the unpoled pellets was found to be 2.3 µC/cm 2 when sintered at 1350 • C. The improvement in dielectric and ferroelectric behavior is attributed to the enhanced homogeneity attained by the coprecipitation synthesis route used in the present study. Correlations between microstructure (sintering conditions) and dielectric behavior is explored.

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“…Various investigators (Manoharan and Patil 1992;Zhang and Stangle 1997;Patro et al 2003) have reported that combustion reaction using stoichiometric amount of urea produces lower flame temperature and higher number of gas molecules than those of stoichiometric amount of glycine. The probable reasons of lower flame temperature in higher urea containing batches are lower enthalpy of urea along with higher gaseous volume released from the reaction.…”

Section: Nature Of Combustion Reactionmentioning

confidence: 99%

Effect of fuel characteristics on synthesis of calcium hydroxyapatite by solution combustion route

et al. 2010

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The effect of fuel characteristics on the processing of nano sized calcium hydroxyapatite (HA) fine powders by the solution combustion technique is reported. Urea, glycine and glucose were used as fuels in this study. By using different combinations of urea and glycine fuels and occasional addition of small amounts of highly water-soluble glucose, the flame temperature (T f ) of the process as well as product characteristics could be controlled easily. The powders obtained by this modified solution combustion technique were characterized by XRD, FTIR spectroscopy, SEM, FESEM-EDX, particle size analyser (PSD) and specific surface area (SSA) measurements. The particle size of phase pure HA powder was found to be <20 nm in this investigation. The effects of glucose addition with stoichiometric (µ = 1) and fuel excess (µ > 1) urea and glycine precursor batches were investigated separately.

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Combustion synthesis of Sr0.5Ba0.5Nb2O6 and effect of fuel on its microstructure and dielectric properties

Cited by 34 publications

References 24 publications

Effect of CASP glass doping on sintering and dielectric properties of SBN ceramics

Effect of CASP glass doping on sintering and dielectric properties of SBN ceramics

Synthesis of Sr0.5Ba0.5Nb2O6 by Coprecipitation Method?Dielectric and Microstructural Characteristics

Effect of fuel characteristics on synthesis of calcium hydroxyapatite by solution combustion route

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