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Superconducting properties of undoped and samples with different addition levels: (a) Magnetic field dependence of in all samples at 20 and ; (b) field dependence of the volume pinning force, , of all samples at . The is normalized by the maximum volume pinning force .
Normalized temperature dependence of and for undoped and doped samples. and were defined as and from the vs curve.
Photographs from FEG-SEM: (a) Undoped , (b) , and (c) .
FWHM as a function of the amount of . , (101), (002), and (110) correspond to , 42.5°, 52.0°, and 60.0°, respectively.
Measured data for undoped and samples with different addition levels. was calculated from the standard criterion of .
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