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Kinetics of YBa2Cu3O7 film growth by postdeposition processing (2000)

Solovyov, Vyacheslav F. ; Wiesmann, Harold J. ; Wu, Li-jun ; [et al.]

Woodbury, NY : American Institute of Physics (AIP)

Applied Physics Letters 76 (2000), S. 1911-1913

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ISSN: 1077-3118

Source: AIP Digital Archive

Topics: Physics

Notes: The ex situ growth of thick textured YBa2Cu3O7 films on SrTiO3 substrates was investigated in order to find the factors, which influence growth kinetics. It was found that the growth rate of YBa2Cu3O7 films remains constant during heat treatment and is proportional to the square root of the H2O partial pressure in the processing atmosphere. Using transmission electron microscopy, we observed that the growth of the YBa2Cu3O7 films proceeds from a thin, ∼7-nm-thick, layer of liquid located at the growth front. Chemical analysis of this layer and the adjacent material suggests that decomposition of an oxifluoride compound in the precursor film occurs at the liquid layer-precursor film interface. The rate of this decomposition reaction defines the growth rate of YBa2Cu3O7. Using a simple model we show that rate of this reaction is limited by the out-diffusion of the decomposition product HF. © 2000 American Institute of Physics.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1063/1.126209

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Analytical electron microscopy study of high Tc superconductor YBa2Cu3O7 (1988)

Sabatini, R. L. ; Heald, S. M. ; Suenaga, Masaki ; [et al.]

New York, NY : Wiley-Blackwell

Journal of Electron Microscopy Technique 8 (1988), S. 307-309

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ISSN: 0741-0581

Keywords: Electron energy loss spectroscopy ; Varying O2 content ; Crystallographic orientation dependence of oxygen near edge features ; Life and Medical Sciences ; Cell & Developmental Biology

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Natural Sciences in General

Notes: The high Tc superconducting material YBa2Cu3O7 shows a complex relationship between microstructure and oxygen content, which are controlled by length of heat treatment, atmosphere, and quench rate. An AEM investigation studying changes in the oxygen near edge features was undertaken. Electron energy loss spectroscopy (EELS) measurements have the important advantage that they can be made on single crystal grains, allowing orentation-dependent studies. Both ion-milled and crushed samples with varying O2 content were analyzed. The structure of YBaCu3O7 was determined by neutron diffraction to be orthorhombic with distinct Cu-O chains along the b-axis as well as Cu-O planes in the a - b plane. Therefore, by looking for a crystallographic dependence of the oxygen K-edge one might be able to distinguish inequivalent oxygen atoms by their core level binding energy and correlate site occupancy with varying O2 content. The EELS results on the oxygen K-edge are strongly dependent on oxygen content, most noticeably when the c-axis is parallel to the electron beam.

Additional Material: 3 Ill.