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Thermal properties of barium complexes used for depositing thin films of YBa2Cu3O7 superconductors

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Abstract

The thermal properties of several barium containing complexes are compared by using thermogravimetric analysis and solids probe mass spectrometry. The properties of complexes containing flourinated and non-fluorinated β-diketonates with and without the presence of a polyether to occupy additional barium coordination sites are compared. Barium complex thermal properties are heavily dependent on the structure of the β-diketones and polyether comprising the complex. Barium complexes containing fluorinated ligands are better suited for chemical vapour deposition of barium than complexes containing non-fluorinated ligands because they efficiently evolve vapours containing barium at lower temperatures.

Zusammenfassung

Unter Einsatz der gravimetrischen Methode und der Massenspektroskopie wurde ein Vergleich der thermischen Eigenschaften einiger bariumhaltigen Komplexe angestellt. Dabei handelt es sich um Komplexe mit Gehalt an fluorierten und nicht fluorierten β-Diketonen im Molekül in und ohne Anwesenheit von Polyether. Die thermischen Eigenschaften der Bariumkomplexe hängen in entscheidendem Maße von der Struktur des im Komplex enthaltenen β-Diketons und Polyethers ab. Bariumkomplexe mit fluorierten Liganden sind besser für die chemische Dampfabscheidung geeignet als Bariumkomplexe mit nichtfluorierten Liganden.

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Inerowicz, H.D., White, R.L. Thermal properties of barium complexes used for depositing thin films of YBa2Cu3O7 superconductors. Journal of Thermal Analysis 45, 653–658 (1995). https://doi.org/10.1007/BF02548879

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