Elasticity, strength, and fracture of HTS YBa2Cu3O7–<i>δ</i> ceramics with varying density in the temperature range 4.2-293 K
V. N. KovalevaPhysicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR, KharkovV. А. MoskalenkoPhysicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR, KharkovV. D. NatsikPhysicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR, KharkovС. Н. СмирновPhysicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR, KharkovV. T. ZagoskinPhysicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR, KharkovYu. G. LitvinenkoPhysicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR, Kharkov
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Annotatsiya
Systematic measurements of the ultimate strength and static Young’s modulus of superconducting yttrium ceramics with varying density (3.6–5.9 g/cm3) are carried out in experiments on quasistatic compression in the temperature interval 4.2-293 K. The effect of porosity as the main structural factor of ceramic materials on mechanical properties and type of fracture is investigated. For ceramics with a low density, a peculiarity in the temperature dependence of strength correlating with anomalies in their acoustic parameters is detected in the temperature range 60–200 K. Physical mechanisms of low-temperature fracture are analyzed as well as their relation with the observed regularities of strength variation.
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