Izvorni znanstveni članak
Grain size distribution of the YBa2Cu3O7-x high temperature superconducting compound
Drago Kunstelj
; Department of Physics, Faculty of Science, University of Zagreb, POBox 162, 41001 Zagreb, Croatia
Sažetak
The grain size distributions of three YBa2Cu3O7-x ceramic samples, annealed at 960° C for different times (t=7, 70 and 700 hours, respectively), have been investigated. Both the average grain size (r) and that in the longest dimension of the grain (l) have been measured. The ratio l/r (reflecting the deviation from the spherical shape) initially increases with the annealing time (t) but tends to decrease at elevated t. An approximate t1/2 increase of l probably reflects a plate-like shape of grains. For all samples the distributions of r and l are fitted best with the log-normal (Gauss) grain size distribution. The correlation between the grain size and critical current distributions is briefly discussed.
Ključne riječi
Hrčak ID:
299423
URI
Datum izdavanja:
1.3.1994.
Posjeta: 197 *