INFLUENCE OF OXYGEN-CONTENT AND STRUCTURAL DEFECTS ON LOW-TEMPERATUREMECHANICAL-PROPERTIES OF HIGH-TEMPERATURE SUPERCONDUCTING SINGLE-CRYSTALS AND CERAMICS
Sv. Lubenets et al., INFLUENCE OF OXYGEN-CONTENT AND STRUCTURAL DEFECTS ON LOW-TEMPERATUREMECHANICAL-PROPERTIES OF HIGH-TEMPERATURE SUPERCONDUCTING SINGLE-CRYSTALS AND CERAMICS, Low temperature physics, 23(8), 1997, pp. 678-683
The data for the microhardness and fracture toughness of Y-Ba-Cu-O and
Bi-based single crystals and ceramics in the temperature range 77-293
K are presented and analyzed. Our study reveals that the microhardnes
s of high temperature superconductors is very sensitive to the oxygen
stoichiometry, the phase composition, the temperature, and to the micr
ostructural defects such as impurities, intergranular boundaries, and
voids. Attention is drawn to the anisotropy of the micromechanical pro
perties and to the features of the fracture in the vicinity of the ind
entation. The data available on the plasticity of Y-Ba-Cu-O and Bi-Sr-
Ca-Cu-O from micro-and macrotests are compared. (C) 1997 American Inst
itute of Physics.