Patterning polymer metal precursors for high temperature superconducting Bi-Sr-Ca-Cu-O-films

Lampe, I. von; Götze, S.; Zygalsky, F.

doi:10.1007/bf00753878

Cited by 12 publications

(1 citation statement)

References 6 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…the YBCO-ceramics, is a thermal decomposition of novolac resins (m-cresol-formaldehyde) containing of corresponding metal nitrates [485][486][487]. The optimal thermolysis in an inert atmosphere starts at 1,023 K, however the formation of BaCO 3 continues in O 2 atmosphere yielding the orthorhombic YBCO-ceramics with a high superconductivity at 91 K. This polymer-mediated approach appears to be perspective for synthesis of HTSC-ceramics and requires further studies.…”

Section: Metal Thiolates and Sulfides In The Polymer Matrixmentioning

confidence: 93%

Nanostructured Materials Preparation via Condensation Ways

Pomogailo

Джардималиева

2014

View full text Add to dashboard Cite

Section: Metal Thiolates and Sulfides In The Polymer Matrixmentioning

confidence: 93%

Nanostructured Materials Preparation via Condensation Ways

Pomogailo

Джардималиева

2014

View full text Add to dashboard Cite

Thermogravimetric and ESR studies of polymer/metal precursors for high‐temperature superconductors

Lampe¹,

Brückner²,

Götze³

1997

Angew. Makromol. Chem.

View full text Add to dashboard Cite

Bi-Sr-Ca-Cu complexes of poly(methacry1ic acid) (PMAA) and cresol novolac, which are precursors for high-temperature superconductors (HTSC) and Cu complexes of those polymers were investigated by ESR spectroscopy and thermogravimetry. In the PMAA samples three different kinds of Cu2+ species were detected: i) Cu2+ pairs, ii) isolated Cu2+ ions and iii) Cu2+ clusters. While Cu2+ pairs are the main species at low Cu concentrations, clusters become dominant at high Cu contents. In the novolac samples Cu2+ was only detected in isolated sites and clusters. The introduction of Cu ions lowered the thermal stability of the polymers and led to a stepwise decomposition. In the PMAA samples the first decomposition step at =22OoC is caused by the Cu2+ pair complexes. ZUSAMMENFASSUNG:Bi-Sr-Ca-Cu-Komplexverbindungen von Polymethacrylsaure (PMAA) und Kresolnovolaken, die als Precursoren fur Hochtemperatursupraleiter (HTSL) eingesetzt werden, sowie deren Cu-Komplexsalze wurden ESR-spektroskopisch und thermogravimetrisch untersucht. In den PMAA-Proben wurden drei verschiedene Cu2+-Spezies nachgewiesen: i) Cu'+-Paare, ii) isolierte Cu2+-Ionen und iii) Cu2+-Cluster. Bei niedrigem Cu-Gehalt der Proben bilden die Cu2+-Paar-Bindungen den Hauptanteil, bei hohem Cu-Gehalt ubenviegen die Clusterbindungen. In den Novolakproben wurden nur isolierte Cu'+-Ionen und Cu2+-Cluster nachgewiesen. Die Einfuhrung der Cu-Ionen emiedrigt die thermische Stabilitat der Polymeren, der thermische Abbau erfolgt stufenweise. In den PMAA-Proben wird die erste Abbaustufe bei = 220 "C durch die Cu2+-Paar-Komplexe verursacht.

show abstract

Complex formation and degradation in poly(acrylonitrile‐co‐vinyl acetate) containing copper nitrate

Silverstein

Najary

Grader

et al. 2004

J Polym Sci B Polym Phys

View full text Add to dashboard Cite

The pyrolysis of polymers containing metal nitrates may provide a relatively simple, rapid, and advantageous method of producing high‐temperature superconductors (HTSCs). The advantage lies in the ability to use conventional polymer processing or microlithographic patterning before pyrolysis. A copolymer of acrylonitrile and vinyl acetate [P(AN‐VA)], a well‐known fiber‐forming polymer, was investigated as a potential HTSC precursor. Complex formation with the highly polar acrylonitrile groups was expected to enhance atomic‐level mixing and hinder nitrate recrystallization. The metal nitrates were found to have a profound effect on P(AN‐VA) pyrolysis. P(AN‐VA) containing copper nitrate (CuN) exhibited complex formation and an exothermic decomposition that began at about 170 °C (reaction 1‐CuN). Reaction 1‐CuN had a heat of about 3.5 kJ/gNO3 and a mass loss of about 0.99 g/gNO3. As reaction 1‐CuN also involved the nitrile groups, it disrupted the nitrile cyclization reaction at about 290 °C. For a P(AN‐VA)/CuN ratio of 2/1, there was no nitrile cyclization, and the thermooxidative degradation temperature was reduced by approximately 200 °C. © 2004 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys 42: 1023–1032, 2004

show abstract

Patterning polymer metal precursors for high temperature superconducting Bi-Sr-Ca-Cu-O-films

Cited by 12 publications

References 6 publications

Nanostructured Materials Preparation via Condensation Ways

Nanostructured Materials Preparation via Condensation Ways

Thermogravimetric and ESR studies of polymer/metal precursors for high‐temperature superconductors

Complex formation and degradation in poly(acrylonitrile‐co‐vinyl acetate) containing copper nitrate

Contact Info

Product

Resources

About