The thermal decomposition of an organometallic precursor for the preparation of YBa₂Cu₃O_7−x

Abstract

Within the area of high-temperature superconductors, thin films will play an important role for many interesting technological and commercial applications if it is possible to produce the oxide superconductors in the form of crystallographically orientated thin films. Generally, the deposition of such layers can be produced via a gas phase or a solution. With regard to the solution process, the high-temperature superconducting material YBa2Cu,07,,L11 which is of special interest for the preparation of thin layers for high current density applications,[21 can be prepared from organometallic precursors i.e., carb~xylates,["~~ P-diketones,['] and alkoxides.16] Above all, the YBa2C~307-x thin films prepared via wet-chemical methods exhibit signifi-

Chemistry and Properties of Nanocrystals of Different Shapes

“…Poly(vinyl alcohol) (PVA) and poly(ethylene glycol) (PEG) are commonly used as protecting agents. Pyrolysis can be used to prepare different kinds of nanoparticles including metals, metal oxides, semiconductors, and composite materials such as Ag, Au, ZrO 2 , Al 2 O 3 , SnO 2 , TiO 2 , GaN, ZnS, YBa 2 Cu 3 O 7 - x , Ni, and carbon nanotubes. − …”

“…To get a uniform nanosized material, some modifications or revisions of the pyrolytic preparation procedure and reaction conditions are needed such as slowing of the reaction rate or decomposition of the precursor in the inert solvent. MCO 201 Ni, 202 and carbon nanotubes. [203][204][205][206][207][208][209][210][211][212][213] Figure 21 shows TEM images for the nanotubes prepared by pyrolysis of organic precursors.…”