Abstract
Extended defects introduced by high temperature deformation into high Tc superconducting ceramics have been characterized by means of transmission electron microscopy.Single crystals of YBa2Cu3O7−x (YBCO) were grown from melting mixtures of yttria, barium carbonate and copper oxide contained in alumina boats. Crystals having tetragonal symmetry grew as platelets with dimensions up to 10×10×0.1 mm3 and the (001) broad surface. Crystals were deformed by Brinell indentation with an indenter of Y-doped zirconia between 550 and 900 °C in air. Most indents were done with a load of 70 grf and a loading period of up to 24 h. Thin specimens were prepared by back-thinning technique using an Ar ion beam at 4 kV.Polycrystals of Bio. 8Pbo. 2SrCa1. 1Cu1. 6Ox (BSCCO) were prepared by sintering process. Rectangular specimens 3×3×8 mm were sectioned from the sintered materials. They were deformed in commpression at 800 °C using strain rate of 1.3×10−5 s−1. Specimens could be deformed to as large as 90 % in a nominal compressive strain.
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