Thermal expansion of a YBa2Cu3O7 superconducting ceramic

Sound attenuation and velocity in superconductive ceramics-a review

“…The difference between the velocity at room temperature and at 4.2 K is in most cases 3-6% both for v1 [25,30,33,34,36,37,39,45,106, 1251 and for U, [25,30,451. The thermal expansion which occurs from 4.2 K to room temperature can be estimated to be (2)(3) x [4,27,[46][47][48][49][50][51][52][53][54][55][56]98, 106, 1081 and, up to 1000 K, to be 1. A structural change manifests itself in the hysteretic behaviour of uI, U, and E between 50 K and 300 K [25, 44, 49, 57-59, 92, 103, 114, 122, 1271 (see figure 5).…”

Influence of Silver Infiltration on the Microstructure and Transport Properties of YbacuO

“…The curves of the composite samples show a maximum between 25 and 40K, due to the silver phase, and an inflection point corresponding to the superconducting transition, which could be due to the decrease of the phonon scattering by electrons [7]. Preliminary results were obtained on samples sintered at 990 0 C.…”