Electronic Resource
Woodbury, NY
:
American Institute of Physics (AIP)
Applied Physics Letters
53 (1988), S. 700-702
ISSN:
1077-3118
Source:
AIP Digital Archive
Topics:
Physics
Notes:
Rheological measurements are used to monitor the sol-gel behavior of a superconducting precursor. A precursor made with an aged yttrium component [Y(OH)3] has a much higher elastic modulus (G') and complex viscosity (η*) but the same loss modulus (G‘) compared to that made with a fresher yttrium solution. The G‘/G' ratio is less than unity for the older solution but greater than 1 for the fresher sample, indicating that the former solution has a more gel-like character. The high viscosity sample gives better fired thick-film superconducting properties but has a shorter shelf life. Measurements on yttrium components of different age show differences in viscosity and G‘/G' which correlate with the behavior of the oxide precursors. Reshearing the precursor solution at any stage during its gelation process can cause irreversible changes in the gel structure.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.100645
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