Partial melt processing of magnetically-aligned YBa/sub 2/Cu/sub 3/O/sub 7- delta / thick films

Author

Lewis, J.A. ; Suratwala, T. ; Arndt, K.C.

Author_Institution

Dept. of Sci. & Eng., Illinois Univ., Urbana, IL, USA

Volume

3

Issue

1

fYear

1993

fDate

3/1/1993 12:00:00 AM

Firstpage

1702

Lastpage

1705

Abstract

Textured YBa/sub 2/Cu/sub 3/O/sub 7-x/ (YBCO) thick films were fabricated in the green state by casting particulate-based suspensions in an applied magnetic field (7 T) at ambient temperature. These films, along with nonaligned films, were fired to various temperatures above the peritectic temperature ( approximately= 1020 degrees C) to evaluate the effects of partial melt processing on their microstructural development and performance properties. The degree of domain alignment in the fired films was measured by X-ray diffraction (XRD) analysis. This showed that the aligned films had a high degree of c-axis texture. Examination by scanning electron microscopy (SEM) revealed distinct differences in both the film density and texture development between aligned and nonaligned films. The magnetic properties of each film were measured at 5 K using a superconducting quantum interference device (SQUID) magnetometer (5.5 T maximum field). These measurements indicated that a high degree of anisotropy was present only in the partial melt processed aligned YBCO films.<>

Keywords

X-ray diffraction examination of materials; barium compounds; crystal growth from melt; high-temperature superconductors; magnetic anisotropy; magnetic domains; magnetisation; scanning electron microscope examination of materials; surface texture; yttrium compounds; 1020 C; 5 K; 5.5 T; 7 T; SEM; SQUID magnetometer; X-ray diffraction analysis; XRD; YBCO; YBa/sub 2/Cu/sub 3/O/sub 7-x/ textured thick films; anisotropy; applied magnetic field; domain alignment; film density; fired films; green state; magnetically aligned thick film; magnetisation; microstructural development; nonaligned films; partial melt processing; particulate leased suspension casting; peritectic temperature; scanning electron microscopy; superconducting quantum interference device; Magnetic anisotropy; Magnetic field measurement; Magnetic films; Melt processing; Perpendicular magnetic anisotropy; SQUIDs; Scanning electron microscopy; Superconducting films; Temperature; Yttrium barium copper oxide;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/77.233609

Filename

233609