A HREM study of the atomic structure and the growth mechanism at the YBa2Cu3O7/YSZ interface

Abstract

The interface between yttria-stabilized zirc~nia (YSZ) substrate and YBazCu107 (YBCO) film was studied by high-resolution electron microscopy. In all specimens we have observed an intermediated layer of BaZQ located between the substrate YSZ and YBCO. The BaZrO, layer is composed of almost equally aligned domains being 4-8 nm in the lateral directions. Reaction products such as Y and Cu oxides were never observed in or close to the BaZrQ reaction layer but they do occur in the YBCO film.

Origin of the ϕ ∼ ±9° peaks in YBa2Cu3O7−δ films grown on cubic zirconia substrates

“…In the former unconstrained case, the BaZrO 3 is oriented (as we demonstrate below) with ͑110͒ BaZrO3 k ͑001͒ YSZ and ͓111͔ BaZrO3 k ͓110͔ YSZ , whereas in the latter constrained case the BaZrO 3 is oriented with ͑001͒ BaZrO3 k ͑001͒ YSZ and ͓100͔ BaZrO3 k ͓100͔ YSZ , 8,19,33,34 or ͑001͒ BaZrO 3 k ͑001͒ YSZ and ͓110͔ BaZrO3 k ͓100͔ YSZ , 8,14 or ͑110͒ BaZrO3 k ͑001͒ YSZ and ͓001͔ BaZrO 3 k ͓100͔ YSZ . In the former unconstrained case, the BaZrO 3 is oriented (as we demonstrate below) with ͑110͒ BaZrO3 k ͑001͒ YSZ and ͓111͔ BaZrO3 k ͓110͔ YSZ , whereas in the latter constrained case the BaZrO 3 is oriented with ͑001͒ BaZrO3 k ͑001͒ YSZ and ͓100͔ BaZrO3 k ͓100͔ YSZ , 8,19,33,34 or ͑001͒ BaZrO 3 k ͑001͒ YSZ and ͓110͔ BaZrO3 k ͓100͔ YSZ , 8,14 or ͑110͒ BaZrO3 k ͑001͒ YSZ and ͓001͔ BaZrO 3 k ͓100͔ YSZ .…”

“…1. 3,[5][6][7][8][9][10][11]14,19,20 The most common orientations observed are rotated 0 ± and 45 ± from the cube-oncube orientation relationship. Two equivalent representations of these crystal structures are shown: the atomic positions (above) and the coordination polyhedra (below).…”

“…[5][6][7][8][9][10][11] The first detailed report 7 of the f ϳ 9 ± peaks was accompanied by a possible explanation for their occurrence involving a near-coincident site lattice model. [5][6][7][8][9][10][11] The first detailed report 7 of the f ϳ 9 ± peaks was accompanied by a possible explanation for their occurrence involving a near-coincident site lattice model.…”

A NOVEL BUFFER LAYER FOR GROWING ULTRATHIN FILMS OF YBa2Cu3Oy ON YSZ SUBSTRATES

“…2 ' 3 The loss of Ba in YBCO would result in imperfection and discontinuities in the initially grown YBCO layer and degradation of superconductivity. 2 The problems become more serious in ultrathin films with a thickness of only a few unit cells. Thus various buffer materials have been employed for making thin and ultrathin films of YBCO.…”

A New Procedure for Making Tem Specimens of Superconductor Devices

“…The sample is mounted process can be monitored by microscope and stopped when a RO the entire edge is thinned, the observable area is relatively large be readily reached. This method has been applied to prepare TEM sample yields fairly good results [3][4][5]. However, the tripod method still has some the sample is polished into a wedge, the eventually observable s near the edge.…”