Texture analysis of melt-textured YBCO superconductors

Koblischka-Veneva, Anjela; Koblischka, Michael Rudolf; Simon, P.; Ogasawara, Kei; Murakami, Masato

doi:10.1016/s0921-4534(03)00731-7

Cited by 6 publications

(5 citation statements)

References 10 publications

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“…The addition of Ce achieved a clear size reduction, but some larger Y-211 particles are still present in the samples. The Y-211 particles do not show any preferred orientation, as was observed earlier [7][8][9][10]. The addition of Y 2 O 3 and M-2411 nanoparticles (without the addition of extra Y-211) can produce samples with embedded nanoparticles and size-reduced Y-211 particles, which then do not show any negative effect on the growth of the YBCO matrix.…”

Section: Resultssupporting

confidence: 60%

“…Due to the size of these nanoparticles, an optical investigation [6] is not possible here any longer, so an analysis with a much higher spatial resolution is required. With the recent developments of the EBSD technique as regards the detection system, enabling one to reach a spatial resolution of less than 50 nm even on ceramic samples [7,8], such measurements became possible. These improvements already allowed us to identify the Kikuchi patterns of the cubic Y 2 Ba 4 CuUO x phase [9], and to perform true three-phase EBSD scans on melt-textured YBCO samples [10].…”

Section: Introductionmentioning

confidence: 99%

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An electron backscatter diffraction investigation of crystallographic orientations of embedded nanoparticles within melt-textured YBCO high temperature superconductors

Koblischka-Veneva

Koblischka

Babu

et al. 2006

Supercond. Sci. Technol.

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Microstructures of melt-textured YBCO samples with embedded nanosized particles of Y2BaCuO5 (Y-211) and Y2Ba4CuMOx (M-2411 with M = U,Zr) are analysed by means of electron backscatter diffraction (EBSD). With the recent developments of the EBSD technique, we can directly measure the crystallographic orientation of the embedded nanoparticles, employing a spatial resolution of about 40 nm. The high image quality of the Kikuchi patterns allows true three-phase (YBCO, Y-211 and M-2411) scans to be performed. The Y-211 particles do not exhibit any preferred orientation, even if their size is considerably reduced, to the 100 nm range. The size reduction reduces the negative influence of the Y-211 particles on the YBCO matrix, however. U-2411 particles, which are formed during the processing stage, do not show any orientation, and with increasing concentration, some texture develops. In contrast to this, embedded Zr-2411 particles are fully oriented in the (001) orientation according to the surrounding superconducting matrix.

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Section: Resultssupporting

confidence: 60%

Section: Introductionmentioning

confidence: 99%

An electron backscatter diffraction investigation of crystallographic orientations of embedded nanoparticles within melt-textured YBCO high temperature superconductors

Koblischka-Veneva

Koblischka

Babu

et al. 2006

Supercond. Sci. Technol.

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“…Since the analysed depth of the material is of the order of 100 nm, the deposition of a conductive coating, either metallic or graphitic, must be avoided [17,18]. The spatial resolution offered by EBSD is lower than 500 nm and fits well with the requirements of multiphase superconductive ceramic characterization [19]. The angular resolution of EBSD, of the order of 1 • -2 • [20], allows the quantification of misorientation between subgrains or twins and its correlation with the local microstructure.…”

Section: Classical Top Seeding Melt Textured Growth (Tsmtg) Processmentioning

confidence: 72%

EBSD study on YBCO textured bulk samples: correlation between crystal growth and ‘microtexture’

Grossin

Henrist

Mathieu

et al. 2006

Supercond. Sci. Technol.

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This work describes an electron backscattered diffraction (EBSD) study of the perovskite-derived structures YBa 2 Cu 3 O 7−δ . After having pointed out the difficulties of EBSD analyses in resolving the orientations of these pseudo-cubic structures, various YBaCuO bulk samples are analysed and the correlation between the microstructure, crystal growth and global texture, determined by neutron diffraction, is carried out. Homogeneous 'microtexture' with small subdomain misorientation of 12 • are measured for YBCO top seeding melt textured growth (TSMTG) samples. YBCO perforated samples also exhibit misoriented subdomains, giving rise to a heterogeneous 'microtexture' correlated to the YBCO growth front and to the pattern used for the perforating.

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“…[6], using only ethanol for cleaning purposes. This procedure yields high image quality Kikuchi patterns and has been demonstrated to work well even on various polycrystalline YBCO samples [6,7]. The high image quality is a prerequisite for the EBSD multi-phase scans.…”

Section: Methodsmentioning

confidence: 94%

Investigation of grain orientations of melt-textured HTSC with addition of uranium oxide, Y₂O₃and Y₂BaCuO₅

Koblischka-Veneva

Holzapfel

Mücklich

et al. 2006

J. Phys.: Conf. Ser.

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Local grain orientations were studied in melt-textured YBCO samples processed with various amounts of depleted uranuim oxide (DU) and Y 2 O 3 by means of electron backscatter diffraction (EBSD) analysis. The addition of DU leads to the formation of Ucontaining nanoparticles (Y 2 Ba 4 CuUO x ) with sizes of around 200 nm, embedded in the superconducting Y-123 matrix. The orientation of the Y 2 BaCuO 5 (Y-211) particles, which are also present in the YBCO bulk microstructure, is generally random as is the case in other melttextured Y-123 samples. The presence of Y-211 particles, however, also affects the orientation of the Y-123 matrix in these samples.

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Texture analysis of melt-textured YBCO superconductors

Cited by 6 publications

References 10 publications

An electron backscatter diffraction investigation of crystallographic orientations of embedded nanoparticles within melt-textured YBCO high temperature superconductors

An electron backscatter diffraction investigation of crystallographic orientations of embedded nanoparticles within melt-textured YBCO high temperature superconductors

EBSD study on YBCO textured bulk samples: correlation between crystal growth and ‘microtexture’

Investigation of grain orientations of melt-textured HTSC with addition of uranium oxide, Y₂O₃and Y₂BaCuO₅

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Texture analysis of melt-textured YBCO superconductors

Cited by 6 publications

References 10 publications

An electron backscatter diffraction investigation of crystallographic orientations of embedded nanoparticles within melt-textured YBCO high temperature superconductors

An electron backscatter diffraction investigation of crystallographic orientations of embedded nanoparticles within melt-textured YBCO high temperature superconductors

EBSD study on YBCO textured bulk samples: correlation between crystal growth and ‘microtexture’

Investigation of grain orientations of melt-textured HTSC with addition of uranium oxide, Y2O3and Y2BaCuO5

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Investigation of grain orientations of melt-textured HTSC with addition of uranium oxide, Y₂O₃and Y₂BaCuO₅