In:
Japanese Journal of Applied Physics, IOP Publishing, Vol. 32, No. 10R ( 1993-10-01), p. 4509-
Abstract:
Pure silver and palladium/silver alloy in a 10/90 weight ratio were either sandwich-coupled or powder-mixed with YBa 2 Cu 3 O 7- X (Y123) to prepare Ag-Y123 and (Pd/Ag)-Y123 composites. The reaction and diffusion of elements near the interface of Ag-Y123 or (Pd/Ag)-Y123 were determined by means of differential thermogravimetry (DTA), optical microscopy (OM), scanning electron microscopy (SEM), transmission electron microscopy (TEM), energy-dispersive X-ray spectroscopy (EDS), and precision X-ray diffraction (XRD) analyses. The results reveal that the Pd, Ag, and Cu react to some extent: Cu will diffuse into pure Ag or Pd/Ag alloy. Conversely, Pd and Ag in pure Ag or Pd/Ag will diffuse toward Y123 at temperatures greater than 945°C. Diffusion of Cu into pure Ag or Pd/Ag alloy will decrease the melting point of the Ag or Pd/Ag alloy due to formation of a solid solution and/or an eutectic constitution. Since molten Cu/Ag or Cu/Pd/Ag alloys can flow across the interface by means of capillary force between Y123 grains, they fill up the voids (or capillaries) between Y123 grains and Ag or Pd diffuse into Y123 grains, occupying Cu sites in Y123. This is consistent with the results of precision XRD, which show the expansion of the Y123 lattice caused by the occupation.
Type of Medium:
Online Resource
ISSN:
0021-4922
,
1347-4065
DOI:
10.1143/JJAP.32.4509
Language:
Unknown
Publisher:
IOP Publishing
Publication Date:
1993
detail.hit.zdb_id:
218223-3
detail.hit.zdb_id:
797294-5
detail.hit.zdb_id:
2006801-3
detail.hit.zdb_id:
797295-7
