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Scanning electron micrographs of the surfaces and cross sections of substrate disc (group A) and discs coated with silver (Ag) or Ag-platinum (Pt) alloys (group B, 100 wt% Ag; group C, Ag–1 wt% Pt; group D, Ag–3 wt% Pt; group E, Ag–7 wt% Pt).
