Abstract
Nd-Ba-Cu-O (NdBCO) precursor powder composed primarily ofNdBa2Cu3O7-δ (Nd-123) and 15 mol% Nd4Ba2Cu2O10(Nd-422) containing 0.1 wt% Au has been prepared by spray drying andsubsequent calcination for the fabrication of bulk melt-processed ceramics.The addition of Au results in the lowering of key process parameters, such asthe peritectic melting point and solidification temperatures by up to30 °C. Additional doping of Au/NdBCO with 5 wt% Ag2O lowers thesevalues further and has enabled the successful nucleation and limited growth ofsingle grains under both air and reduced oxygen atmospheres using undopedNdBCO as a seed. The advantage of this self-seeded melt growth technique isthat it avoids the lattice mismatch that results from the conventional use ofa MgO seed.
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