A study of the effect of KClO3 addition on the AC susceptibility and micro structure of high-temperature (Tconset at 105 K) YBCO ceramic superconductors

A. Veneva; I. Iordanov; L. Toshev; A. Stoyanova-Ivanova; D. Gogova

doi:10.1016/S0921-4534(98)00344-X

A study of the effect of KClO₃ addition on the AC susceptibility and micro structure of high-temperature (T_c^onset at 105 K) YBCO ceramic superconductors

A. Veneva, I. Iordanov, L. Toshev, A. Stoyanova-Ivanova, D. Gogova

Research output: Contribution to journal › Article › peer-review

28 Citations (Scopus)

Abstract

Bulk Y₁Ba₂Cu₃O_y superconductors with KClO₃ or K₂CO₃ additives were synthesized by a solid state reaction method. The influence of additives on the AC susceptibility, morphology and microstructure of samples with nominal compositions Y₁Ba_2-xK_xCu₃O_y, Y₁Ba₂Cu_3.5-xK_xO_y, Y_1-0.2xBa_2-0.2xK_xCu₃O_y, (x=0.2) were investigated. Experimental results showed a promoting effect of the additives on the formation of 123 phase in air atmosphere. Only traces of potassium were observed in all samples after the final backing, but chlorine was remained in the material. The superconducting transition temperature for all KClO₃-doped samples was found to be higher than that for K₂CO₃-doped and undoped Y₁Ba₂Cu₃O_y (YBCO). KClO₃-doped Y₁Ba_1.8K_0.2Cu₃O_y with T_c^onset at 105 K was obtained. The comparison of characteristics for samples with various potassium compound in the initial batch demonstrated that each additive had a specific effect on _X(T), ΔT_C and microstructure of YBCO high-temperature superconductors (HTSC). The results were discussed in terms of different interaction in which KClO₃ and K₂CO₃ participate up to 900°C.

Original language	English
Pages (from-to)	175-184
Number of pages	10
Journal	Physica C: Superconductivity and its applications
Volume	308
Issue number	3-4
DOIs	https://doi.org/10.1016/S0921-4534(98)00344-X
Publication status	Published - 1998 Nov 20
Externally published	Yes

Keywords

AC susceptibility YBCO
KCO-doped YBCO
KClO-doped YBCO
Microstructure
YBCO ceramic preparation

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Energy Engineering and Power Technology
Electrical and Electronic Engineering

Access to Document

10.1016/S0921-4534(98)00344-X

Cite this

A study of the effect of KClO₃ addition on the AC susceptibility and micro structure of high-temperature (T_c^onset at 105 K) YBCO ceramic superconductors. / Veneva, A.; Iordanov, I.; Toshev, L.; Stoyanova-Ivanova, A.; Gogova, D.

In: Physica C: Superconductivity and its applications, Vol. 308, No. 3-4, 20.11.1998, p. 175-184.

Research output: Contribution to journal › Article › peer-review

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abstract = "Bulk Y1Ba2Cu3Oy superconductors with KClO3 or K2CO3 additives were synthesized by a solid state reaction method. The influence of additives on the AC susceptibility, morphology and microstructure of samples with nominal compositions Y1Ba2-xKxCu3Oy, Y1Ba2Cu3.5-xKxOy, Y1-0.2xBa2-0.2xKxCu3Oy, (x=0.2) were investigated. Experimental results showed a promoting effect of the additives on the formation of 123 phase in air atmosphere. Only traces of potassium were observed in all samples after the final backing, but chlorine was remained in the material. The superconducting transition temperature for all KClO3-doped samples was found to be higher than that for K2CO3-doped and undoped Y1Ba2Cu3Oy (YBCO). KClO3-doped Y1Ba1.8K0.2Cu3Oy with Tconset at 105 K was obtained. The comparison of characteristics for samples with various potassium compound in the initial batch demonstrated that each additive had a specific effect on X(T), ΔTC and microstructure of YBCO high-temperature superconductors (HTSC). The results were discussed in terms of different interaction in which KClO3 and K2CO3 participate up to 900°C.",

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AU - Stoyanova-Ivanova, A.

AU - Gogova, D.

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