Preparation and Characterization of Large-Quantity Bi-2223 Precursor Powder by Oxalate Coprecipitation

Cui, Lijie; Zhang, P. X.; Li, J. S.; Guo, Yan; Wang, D. Y.; Pan, Xifeng; Liu, G. Q.; Hao, Qingbin; Liu, X. H.; Feng, Yin

doi:10.1109/tasc.2016.2583778

Cited by 3 publications

(4 citation statements)

References 11 publications

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“…The reason why Equation (10) should approximate λ is a conundrum. Firstly, the most abundant form of each rare earth will be the mono-oxalato complex only in a concentrated solution of oxalic acid according to Equation (5). In the present case, a hydrolyzing ester will only produce a very dilute concentration of oxalic acid before precipitation occurs, meaning that the most abundant form of rare earth in solution will be the free or weakly-complexed ion according to Equation (5).…”

Section: Discussionmentioning

confidence: 97%

“…Firstly, the most abundant form of each rare earth will be the mono-oxalato complex only in a concentrated solution of oxalic acid according to Equation (5). In the present case, a hydrolyzing ester will only produce a very dilute concentration of oxalic acid before precipitation occurs, meaning that the most abundant form of rare earth in solution will be the free or weakly-complexed ion according to Equation (5). This implies that the measured final concentrations are mainly made up of free or weakly-complexed rare earth ions, and that the model is still a relation between the concentration of these ions and the fractions on the surface of the precipitate.…”

Section: Discussionmentioning

confidence: 99%

“…Oxalate coprecipitation is a standard method for producing precursor powders that are calcined into mixed metal oxides. Examples in the literature abound, such as precursors for magnetic materials [3], piezoelectric oxides [4], superconducting materials [5,6] and alloys [7]. It is also used to separate rare earths and actinides from other ions in solution by precipitation.…”

Section: Introductionmentioning

confidence: 99%

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Predicting the Logarithmic Distribution Factors for Coprecipitation into an Organic Salt: Selection of Rare Earths into a Mixed Oxalate

Watts

Leong

2020

Minerals

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Thermodynamic modelling of a leaching system that involves concurrent precipitation depends on an understanding of how the metals distribute into the precipitate before an assessment of solubility can be made. It has been suggested in the past that a pair of rare earths (A and B) in solution will separate from each other by oxalate precipitation according to a logarithmic distribution coefficient (λ), determined by the kinetics of the precipitation. By contrast, the present study hypothesises that λ may be approximated from thermodynamic terms, including the solubility product (KSp) of each rare earth oxalate and the stability constant (β1) for the mono-oxalato complex of each rare earth. The proposed model was used to calculate λ between pairs of rare earths. An experimental study was conducted to determine λ between selected pairs using homogenous precipitation through the hydrolysis of an oxalic acid ester, with fairly close agreement to the values under the proposed model. Though this model requires more thorough testing, as well as application to other organic salts, it may provide insight into distribution factors of a precipitate formed by a sequence of organic complexes.

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Section: Discussionmentioning

confidence: 97%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Predicting the Logarithmic Distribution Factors for Coprecipitation into an Organic Salt: Selection of Rare Earths into a Mixed Oxalate

Watts

Leong

2020

Minerals

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“…The tape is heat-treated as reported elsewhere. [14] Figure 8 shows the I-V curve of 37-filament tape, which is measured at liquid nitrogen temperature. It can be seen that critical current is about 120 A in self-field, 047401-4 which is comparable to the value for Bi-2223 tape heat-treated without over-pressure heat treatment.…”

Section: -3mentioning

confidence: 99%

Heat treatment on phase evolution of Bi-2223 precursor powder prepared by spray pyrolysis method

Cui¹,

Zhang²,

Li³

et al. 2019

Chinese Phys. B

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The phase evolution of Bi-2223 precursor powder prepared by spray pyrolysis method is studied with different heat treatment parameters. The results show that the reaction temperature and phase composition of precursor powder depend on heat treatment atmosphere. Phase assemblage of (Bi,Pb)-2212, AEC, CuO, and small Bi-2201 can be obtained by heat-treated in N 2 -0.1%O 2 atmosphere. For precursor powder, there is sufficient reaction process at 770 • C, and the dimension of Bi-2212 phase increases rapidly with the increase of heat treatment temperature and time. The dimension of AEC phase also increases by extending heat treatment time. As a balance among phase assemblage, dimension of particle and adequate reaction, a reasonable precursor powder can be obtained by heat-treated at 770 • C for 12 h-16 h in N 2 -0.1%O 2 atmosphere. Critical current of 37-filament Bi-2223 tape is about 120 A, which confirms that these heat treatment parameters are reasonable.

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Evolution of precursor powders prepared by oxalate freeze drying towards high performance Bi-2212 wires

Jin

Liu

et al. 2021

Ceramics International

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Preparation and Characterization of Large-Quantity Bi-2223 Precursor Powder by Oxalate Coprecipitation

Cited by 3 publications

References 11 publications

Predicting the Logarithmic Distribution Factors for Coprecipitation into an Organic Salt: Selection of Rare Earths into a Mixed Oxalate

Predicting the Logarithmic Distribution Factors for Coprecipitation into an Organic Salt: Selection of Rare Earths into a Mixed Oxalate

Heat treatment on phase evolution of Bi-2223 precursor powder prepared by spray pyrolysis method

Evolution of precursor powders prepared by oxalate freeze drying towards high performance Bi-2212 wires

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