The structural and chemical evolution of propionate based low fluorine YBa 2Cu 3O 7 - δ (YBCO) precursor during the conversion thermal treatment to obtain superconducting film has been investigated by both x-ray photoelectron and diffraction techniques in a set of partially converted films on SrTiO 3 single crystals. The pyrolysis temperature within the range 400-480 °C mainly affects the copper valence state with an increase of the Cu 2 + fraction with temperature with respect to the Cu 1 + oxidation state. During the subsequent thermal treatment up to 700 °C, the reduction of fluorine content is mainly ascribed to the hydrolysis of YF 3. At higher temperatures, Ba hydrolysis, Y 2Cu 2O 5 and YBCO phase formation (nucleation at 700 °C and 725 °C, respectively) have been observed. The temperature dependences of the formation and decomposition of YBCO, Y 2Cu 2O 5 and Ba-oxyfluoride were evaluated by x-ray diffraction measurements. The reaction path emerging from these analyses agrees with the one observed for YBCO films obtained with the standard MOD method based on metal tri-fluoroacetate precursors

Armenio, A., Augieri, A., Ciontea, L., Contini, G., Davoli, I., Giovannantonio, M., et al. (2011). Structural and chemical evolution of propionate based metal-organic precursors for superconducting YBa 2Cu 3O 7 - δ epitaxial film growth. SUPERCONDUCTOR SCIENCE & TECHNOLOGY, 24(11) [10.1088/0953-2048/24/11/115008].

Structural and chemical evolution of propionate based metal-organic precursors for superconducting YBa 2Cu 3O 7 - δ epitaxial film growth

DAVOLI, IVAN;
2011

Abstract

The structural and chemical evolution of propionate based low fluorine YBa 2Cu 3O 7 - δ (YBCO) precursor during the conversion thermal treatment to obtain superconducting film has been investigated by both x-ray photoelectron and diffraction techniques in a set of partially converted films on SrTiO 3 single crystals. The pyrolysis temperature within the range 400-480 °C mainly affects the copper valence state with an increase of the Cu 2 + fraction with temperature with respect to the Cu 1 + oxidation state. During the subsequent thermal treatment up to 700 °C, the reduction of fluorine content is mainly ascribed to the hydrolysis of YF 3. At higher temperatures, Ba hydrolysis, Y 2Cu 2O 5 and YBCO phase formation (nucleation at 700 °C and 725 °C, respectively) have been observed. The temperature dependences of the formation and decomposition of YBCO, Y 2Cu 2O 5 and Ba-oxyfluoride were evaluated by x-ray diffraction measurements. The reaction path emerging from these analyses agrees with the one observed for YBCO films obtained with the standard MOD method based on metal tri-fluoroacetate precursors
Pubblicato
Rilevanza internazionale
Articolo
Esperti anonimi
Settore FIS/03 - Fisica della Materia
English
Con Impact Factor ISI
Armenio, A., Augieri, A., Ciontea, L., Contini, G., Davoli, I., Giovannantonio, M., et al. (2011). Structural and chemical evolution of propionate based metal-organic precursors for superconducting YBa 2Cu 3O 7 - δ epitaxial film growth. SUPERCONDUCTOR SCIENCE & TECHNOLOGY, 24(11) [10.1088/0953-2048/24/11/115008].
Armenio, A; Augieri, A; Ciontea, L; Contini, G; Davoli, I; Giovannantonio, M; Galluzzi, V; Mancini, A; Rufoloni, A; Petrisor, T; Vannozzi, A; Celentano, G
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/2108/136277
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