Microstructure of Nd-Ba-Cu-O superconductors prepared by the oxygen-controlled-melt-growth method

P. Diko; H. Kojo; M. Murakami

doi:10.1016/S0921-4534(96)00710-1

Microstructure of Nd-Ba-Cu-O superconductors prepared by the oxygen-controlled-melt-growth method

P. Diko, H. Kojo, M. Murakami

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

10 Citations (Scopus)

Abstract

Microstructure, analyses by polarized light microscopy show that Nd₄Ba₂Cu₂O₁₀ (Nd422) particles in oxygen-controlled-melt-grown NdBaCuO bulk superconductors have similar influence on the NdBa₂Cu₃O_7-x (Nd123) microstructure as Y211 particles in the Y123-211 system. The twin spacing decreases with shortening of mean distance between Nd422 particles. The a-b microcracking in the 123 matrix was ascribed to thermal stresses around Nd422 particles set up in the matrix during cooling due to the different thermal expansion of Nd 123 and Nd422 phases. The relaxation of thermal stresses in the 〈100〉 directions by twin boundary motion was related to the observed rosette of detwinned regions or regions with predominance of one twin variant formed around Nd422 particles. The level of thermal stresses was estimated. The elongated c- and a-subgrains with rectangular cross section were shown to be a result of cellular growth, i.e. the subgrains in melt-processed REBaCuO (RE: rare earth) are growth related crystal defects.

Original language	English
Pages (from-to)	185-196
Number of pages	12
Journal	Physica C: Superconductivity and its applications
Volume	276
Issue number	3-4
DOIs	https://doi.org/10.1016/S0921-4534(96)00710-1
Publication status	Published - 1997 Mar 15
Externally published	Yes

Keywords

Bulk HTSC
Microcracking
Microscopy
Subgrains
Thermal microstresses
Twins

ASJC Scopus subject areas

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

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10.1016/S0921-4534(96)00710-1

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title = "Microstructure of Nd-Ba-Cu-O superconductors prepared by the oxygen-controlled-melt-growth method",

abstract = "Microstructure, analyses by polarized light microscopy show that Nd4Ba2Cu2O10 (Nd422) particles in oxygen-controlled-melt-grown NdBaCuO bulk superconductors have similar influence on the NdBa2Cu3O7-x (Nd123) microstructure as Y211 particles in the Y123-211 system. The twin spacing decreases with shortening of mean distance between Nd422 particles. The a-b microcracking in the 123 matrix was ascribed to thermal stresses around Nd422 particles set up in the matrix during cooling due to the different thermal expansion of Nd 123 and Nd422 phases. The relaxation of thermal stresses in the 〈100〉 directions by twin boundary motion was related to the observed rosette of detwinned regions or regions with predominance of one twin variant formed around Nd422 particles. The level of thermal stresses was estimated. The elongated c- and a-subgrains with rectangular cross section were shown to be a result of cellular growth, i.e. the subgrains in melt-processed REBaCuO (RE: rare earth) are growth related crystal defects.",

keywords = "Bulk HTSC, Microcracking, Microscopy, Subgrains, Thermal microstresses, Twins",

author = "P. Diko and H. Kojo and M. Murakami",

note = "Funding Information: This work was supported by JSPS for the Priority-Area Research in Japan and by Grand Agency of Slovak Academy of Sciences (Project No. 2/1323/94).",

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doi = "10.1016/S0921-4534(96)00710-1",

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AU - Diko, P.

AU - Kojo, H.

AU - Murakami, M.

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PY - 1997/3/15

Y1 - 1997/3/15

N2 - Microstructure, analyses by polarized light microscopy show that Nd4Ba2Cu2O10 (Nd422) particles in oxygen-controlled-melt-grown NdBaCuO bulk superconductors have similar influence on the NdBa2Cu3O7-x (Nd123) microstructure as Y211 particles in the Y123-211 system. The twin spacing decreases with shortening of mean distance between Nd422 particles. The a-b microcracking in the 123 matrix was ascribed to thermal stresses around Nd422 particles set up in the matrix during cooling due to the different thermal expansion of Nd 123 and Nd422 phases. The relaxation of thermal stresses in the 〈100〉 directions by twin boundary motion was related to the observed rosette of detwinned regions or regions with predominance of one twin variant formed around Nd422 particles. The level of thermal stresses was estimated. The elongated c- and a-subgrains with rectangular cross section were shown to be a result of cellular growth, i.e. the subgrains in melt-processed REBaCuO (RE: rare earth) are growth related crystal defects.

AB - Microstructure, analyses by polarized light microscopy show that Nd4Ba2Cu2O10 (Nd422) particles in oxygen-controlled-melt-grown NdBaCuO bulk superconductors have similar influence on the NdBa2Cu3O7-x (Nd123) microstructure as Y211 particles in the Y123-211 system. The twin spacing decreases with shortening of mean distance between Nd422 particles. The a-b microcracking in the 123 matrix was ascribed to thermal stresses around Nd422 particles set up in the matrix during cooling due to the different thermal expansion of Nd 123 and Nd422 phases. The relaxation of thermal stresses in the 〈100〉 directions by twin boundary motion was related to the observed rosette of detwinned regions or regions with predominance of one twin variant formed around Nd422 particles. The level of thermal stresses was estimated. The elongated c- and a-subgrains with rectangular cross section were shown to be a result of cellular growth, i.e. the subgrains in melt-processed REBaCuO (RE: rare earth) are growth related crystal defects.

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KW - Microcracking

KW - Microscopy

KW - Subgrains

KW - Thermal microstresses

KW - Twins

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Microstructure of Nd-Ba-Cu-O superconductors prepared by the oxygen-controlled-melt-growth method

Abstract

Keywords

ASJC Scopus subject areas

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