Synthesis of Y3Ba5Cu8O18 superconductor powder by auto-combustion reaction: Effects of citrate–nitrate ratio

Suan, Mohd Shahadan Mohd; Johan, Mohd Rafie; Siang, Tat Chua

doi:10.1016/j.physc.2012.05.006

Cited by 27 publications

(7 citation statements)

References 12 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The samples with greater superconducting phase showed a higher T c , which was influenced by the synthesis method used and the synthesis conditions. Besides, superconductors of higher purity than those reported by other authors were obtained 6,12,14 .…”

Section: Resultsmentioning

confidence: 77%

“…The RE358 (RE = rare earth) superconductor system has been commonly synthesized by the solid-state reaction method, starting from stoichiometric mixtures of oxides and carbonates, and using high temperatures for a long time 9,10 . This led to the use of wet methods such as sol-gel 11 and combustion 12 , which favor obtaining pure materials and nanocrystalline powders 13,14 . Nevertheless, the sol-gel method has disadvantages associated with parameters, which must be carefully modified such as precursors, solvent, and pH, to reach the desired composition, and microstructure properties.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Synthesis of the La3Ba5Cu8O18-δ and Sm3Ba5Cu8O18-δ superconductors by the combustion and solid-state reaction methods

et al. 2021

View full text Add to dashboard Cite

In this paper, the synthesis of the La 3 Ba 5 Cu 8 O 18-δ and Sm 3 Ba 5 Cu 8 O 18-δ superconductors using the combustion method is reported for the first time. Besides, a comparison with the solid-state reaction method was performed. The materials were synthesized at 870 °C for 24 h under oxygen flow. Rietveld refinement showed materials with the main crystal phase corresponding to the orthorhombic structure of space-group Pmm2 (25), with purity in the range 51-85%, which had not reported for the RE358 systems. On the other hand, the magnetic measurements under external fields (30 and 100 Oe) confirmed the diamagnetic response associated with the Meissner effect, and T c values between 24 and 58 K.

show abstract

Section: Resultsmentioning

confidence: 77%

Section: Introductionmentioning

confidence: 99%

Synthesis of the La3Ba5Cu8O18-δ and Sm3Ba5Cu8O18-δ superconductors by the combustion and solid-state reaction methods

et al. 2021

View full text Add to dashboard Cite

show abstract

“…Knowing the metal–citrate complex (gel) structure is an efficient tool to understand the citrate to metal cation ratio (C/M) corresponding to a stoichiometric mixture 2 . There are enormous reports revealing the influence of pH and C/M on the properties of combustion product in terms of the stoichiometry between fuel and oxidant 13,24–28 . However, there are no reports that correlate the metal–citrate complex structure with the stoichiometry of redox mixture and the resultant phase purity of the combustion product.…”

Section: Introductionmentioning

confidence: 99%

“…2 There are enormous reports revealing the influence of pH and C/M on the properties of combustion product in terms of the stoichiometry between fuel and oxidant. 13,[24][25][26][27][28] However, there are no reports that correlate the metal-citrate complex structure with the stoichiometry of redox mixture and the resultant phase purity of the combustion product. We have derived the metal-citrate complex structure formed in the xerogel during the production of BaZrO 3 nanoparticles by citrate-nitrate sol-gel autocombustion technique in our earlier report and extracted an optimal C/M value of 1.5 required for the maximum yield of phase pure BaZrO 3 nanopowder.…”

Section: Introductionmentioning

confidence: 99%

Variation of citrate to metal cation ratio for dense and phase pure BaZrO₃ via autocombustion synthesis

Manju

Babu

et al. 2022

J Am Ceram Soc.

View full text Add to dashboard Cite

In this work, we demonstrate how the metal–citrate complex structure formed in the gel reflects the true stoichiometry of the redox mixtures to yield a highly dense BaZrO3 ceramic obtained as a combustion product in the sol‐gel autocombustion technique. By systematically varying the citric acid to metal cation ratio (C/M) between 0.56, 1.0, 1.5, and 2, we show that the optimal synthesis parameters correspond to C/M ratio of 1.5, at which ratio complete chelation of citrates happen with nitrates. This was confirmed using TGA, which showed a single‐step weight loss peak corresponding to C/M =1.5 but multiple peaks in C/M ratios of 0.56 and 1. PXRD and FTIR measurements on all the burnt powders showed multiphase peaks for the C/M ratios 0.56 and 1 but only peaks corresponding to BaZrO3 for C/M = 1.5, apart from a very tiny BaCO3$_3$ peak. Combustion behavior of each sol‐gel corresponding to C/M ratios 0.56, 1.0, 1.5, and 2.0 is described in detail, wherein 0.56 and 1.0 sol‐gels were found to belong to the smouldering/less intense flame‐type combustion, while 1.5 and 2 belonged to the intense flame combustion, contradicting oxidant to reductant ratio (O/R) calculations that require a stoichiometric combustion for C/M ratio of 0.56 to result in an intense flame combustion. This discrepancy was explained by the optimal usage of NO3−$_3^-$ ions in the gel structure corresponding to C/M ratio of 1.5 since a complete chelation of citrates to nitrates ions happen for C/M = 1.5. The observed combustion behavior, phase purity, and other characteristics of stoichiometric/ nonstoichiometric combustion products are illustrated by means of the extent of the 3D metal–citrate complex network formed as a function of C/M. The density of the sintered pellets that were sintered at a temperature of 1650∘$^\circ$C was found to be the best at 99.6%$\%$ for the C/M ratio 1.5. This is the highest ever reported density for BaZrO3 ceramic demonstrating that C/M ratio of 1.5 represents that metal to cation ratio for which best chelation of citrates happen with nitrates resulting in the formation of dense BaZrO3 ceramics. A comparison of BaZrO3$_3$ pellet made by solid‐state synthesis technique yielded a low value of density of 97.5%$\%$. Impedance spectroscopy measurements done on all BaZrO3$_3$ pellets yielded the lowest grain‐boundary resistance for the pellet made by the sol‐gel technique with C/M ratio of 1.5.

show abstract

“…Two groups have attempted to characterize Y-358, one obtaining lattice parameters similar to Y-123 [7,8], while the other group proposed that the lattice parameters, a and b, of Y-358 are very close to those of Y-123, but the lattice parameter c of Y358 is almost 3 times to that of Y123 [6]. The discovery of superconductivity in Y-358 at temperatures as high as 100 K has attracted considerable interest and some preparation methods such as auto-combustion and Melt-Powder-Melt-Growth [9][10][11] have been employed and superconducting transition temperatures ranging from 80 to 98 K have been reported. Due to the structural resemblance of Y-123 and Y-358, there are some discrepancies in distinguishing between them.…”

Section: Introductionmentioning

confidence: 99%

Comparative study of nano-sized particles CoFe2O4 effects on superconducting properties of Y-123 and Y-358

Slimani

Hannachi

Salem

et al. 2014

Physica B: Condensed Matter

View full text Add to dashboard Cite

Synthesis of Y3Ba5Cu8O18 superconductor powder by auto-combustion reaction: Effects of citrate–nitrate ratio

Cited by 27 publications

References 12 publications

Synthesis of the La3Ba5Cu8O18-δ and Sm3Ba5Cu8O18-δ superconductors by the combustion and solid-state reaction methods

Synthesis of the La3Ba5Cu8O18-δ and Sm3Ba5Cu8O18-δ superconductors by the combustion and solid-state reaction methods

Variation of citrate to metal cation ratio for dense and phase pure BaZrO₃ via autocombustion synthesis

Comparative study of nano-sized particles CoFe2O4 effects on superconducting properties of Y-123 and Y-358

Contact Info

Product

Resources

About

Synthesis of Y3Ba5Cu8O18 superconductor powder by auto-combustion reaction: Effects of citrate–nitrate ratio

Cited by 27 publications

References 12 publications

Synthesis of the La3Ba5Cu8O18-δ and Sm3Ba5Cu8O18-δ superconductors by the combustion and solid-state reaction methods

Synthesis of the La3Ba5Cu8O18-δ and Sm3Ba5Cu8O18-δ superconductors by the combustion and solid-state reaction methods

Variation of citrate to metal cation ratio for dense and phase pure BaZrO3 via autocombustion synthesis

Comparative study of nano-sized particles CoFe2O4 effects on superconducting properties of Y-123 and Y-358

Contact Info

Product

Resources

About

Variation of citrate to metal cation ratio for dense and phase pure BaZrO₃ via autocombustion synthesis