Simultaneous coprecipitation of the hydroxides for preparing YBa2Cu3O7 superconductors

Khurana, Bharat; Tripathi, Rahul; Khullar, Sadhika; Kotnala, R.K.; Singh, Satyendra; Jain, Kiran; Reddi, B.V.; Goel, Rahul; Das, B. K.

doi:10.1007/bf00730738

Cited by 9 publications

(3 citation statements)

References 6 publications

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“…In the hydroxide process, the cations are precipitated from the solutions by using NaOH/KOH or NH 4 OH as the precipitating agent. The hydroxide precipitation of YBCO superconductors has been studied by several groups [83][84][85][86][87].…”

Section: (B) Coprecipitation Processmentioning

confidence: 99%

“…For example, the preparation of hydroxides of the cations from the nitrate solutions using 1 M NaOH solution was studied by Khurana et al [85], in which the pH of the solution was increased to ≈13 and a bluish precipitate was obtained. The precipitate was completely oxidized to a brownish precipitate after bubbling oxygen for 8 h. The Na content in the calcined powder was estimated to be 0.01 wt%, which is a problem, as alkali impurities are known to decrease the T c values.…”

Section: (B) Coprecipitation Processmentioning

confidence: 99%

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A review on the synthesis of Y–Ba–Cu-oxide powder

Pathak¹,

Mishra²

2005

Supercond. Sci. Technol.

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The preparation of Y–Ba–Cu-oxide (YBCO) powder by various techniques is critically reviewed and the synthesis of ultrafine superconducting YBa2Cu3Ox(123) powders is specially emphasized. The fine powder has assumed a large importance, requiring the minimization of processing parameters (time and temperature) during calcination, homogenization and sintering to avoid the problems of evaporation of the constituent oxides. From the voluminous research activities on YBCO it is known that by adopting any preparation technique the superconducting transition temperature (Tc) value of ≈92 K could be achieved in the bulk samples, thus in this review the Tc values are not emphasized. Also, the other transport properties such as critical current densities (Jc) and magnetic properties are not discussed, since these properties are mainly controlled by many other parameters related to the weak link across the grain boundaries of the specimens, and a very little role is played by the synthetic procedure. The weak links across the grain boundaries are known to be the cause for the poor Jc values in bulk specimens and those weak links are observed due to the presence of impurities at the grain boundaries, misorientation of grains and oxygenation of the samples. By selecting the proper synthetic procedure, only the impurity problem can be solved, and to remove the other problems, a proper fabrication method needs to be adopted. This review will guide the new researcher to find the appropriate technique to synthesize good quality YBCO powder.

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Section: (B) Coprecipitation Processmentioning

confidence: 99%

Section: (B) Coprecipitation Processmentioning

confidence: 99%

A review on the synthesis of Y–Ba–Cu-oxide powder

Pathak¹,

Mishra²

2005

Supercond. Sci. Technol.

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“…The practical limitations of the standard ceramic technique make it difficult to achieve homogeneous fine particles of the oxide mixture, which is one of the pre-requisites for a good quality superconductor. Many workers (Chu and Dunn 1987;Dunn et al 1987;Fujiki et al 1987;Kini et al 1987;Sribata et al 1987Khurana et al 1989) have used the well-known chemical method for preparing the YBa2Cu3OT_ x superconductor. This method is known to provide a very fine and highly homogeneous mixture of the respective oxide powders as a starting material for the fabrication of shaped structures like wire and thin films of superconducting materials.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Y-Ba-Cu-O superconducting material by citrate chemical route—some observations

et al. 1991

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Precipitation Behavior of Metal Ions in the Preparation of YBa₂Cu₃O_y and (Bi, Pb)₂(Sr, Ca)₄Cu₃O_y Superconductive Materials in 8‐Hydroxyquinoline‐diethylamine Media

Chen¹,

Sheen²,

Chen³

et al. 1992

J Chinese Chemical Soc

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To prepare the YBa2Cu3Oy (Y‐123) and (Bi, Pb)2(Sr, Ca)4Cu3Oy (Bi‐2223) superconductive materials, coprecipitation was used with 8‐hydroxyquinoline (oxine) as precipitant to ensure complete precipitation. Various aspects of competitive reactions such as dissociation, precipitation, complex formation and association in the aqueous solution system containing metal ions, oxinate ion and diethylamine species have been explored in order to discover the optimal coprecipitation conditions of the title system. Experiments were conducted to confirm these conditions.

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Simultaneous coprecipitation of the hydroxides for preparing YBa2Cu3O7 superconductors

Cited by 9 publications

References 6 publications

A review on the synthesis of Y–Ba–Cu-oxide powder

A review on the synthesis of Y–Ba–Cu-oxide powder

Synthesis of Y-Ba-Cu-O superconducting material by citrate chemical route—some observations

Precipitation Behavior of Metal Ions in the Preparation of YBa₂Cu₃O_y and (Bi, Pb)₂(Sr, Ca)₄Cu₃O_y Superconductive Materials in 8‐Hydroxyquinoline‐diethylamine Media

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Simultaneous coprecipitation of the hydroxides for preparing YBa2Cu3O7 superconductors

Cited by 9 publications

References 6 publications

A review on the synthesis of Y–Ba–Cu-oxide powder

A review on the synthesis of Y–Ba–Cu-oxide powder

Synthesis of Y-Ba-Cu-O superconducting material by citrate chemical route—some observations

Precipitation Behavior of Metal Ions in the Preparation of YBa2Cu3Oy and (Bi, Pb)2(Sr, Ca)4Cu3Oy Superconductive Materials in 8‐Hydroxyquinoline‐diethylamine Media

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Precipitation Behavior of Metal Ions in the Preparation of YBa₂Cu₃O_y and (Bi, Pb)₂(Sr, Ca)₄Cu₃O_y Superconductive Materials in 8‐Hydroxyquinoline‐diethylamine Media