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The microstructure of YBaCuO/Ag composite materials prepared from precursors YBa 2 Cu 3 O 7 (Y123) + 0.24Y 2 O 3 + Ag 2 O with different amounts of Ag 2 O addition, grown at different furnace cooling rates, was analysed quantitatively by image processing of optical microscopy images. The critical average Ag concentration in the melt for the start and the steady state of Ag particle formation was estimated. A higher growth rate causes elongation and alignment of Ag particles in the growth direction. Type B monotectic crystallization was identified to take place in the hypermonotectic compositions. Monotectic and hypermonotectic types of Ag particles, which differ in size and morphology, were distinguished and the mechanisms of their formation proposed, taking into account the influence of both Ag and Y 2 O 3 additions on the phase equilibria and considering a certain solubility of Ag in Y123.
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Diko et al. (2001) studied this question.
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