caa a22 4500 463227328 CHVBK 20180405153231.0 cr unu---uuuuu 170326e20070501xx s 000 0 eng 10.1007/s10853-006-1201-6 doi (NATIONALLICENCE)springer-10.1007/s10853-006-1201-6 Microscopic structural evolution in terms of porosity in high-Tc superconductors [Elektronische Daten] [Nasr-Eddine Chakri, Abdelaziz Benaldjia, Abdelaziz Amara, Mohamed Benloucif, Mohamed Guerioune] The low critical current densities of high-Tc superconductors materials can be related to the microstructural imperfections such as pores and microcracks, which reduce the effective current carrying cross section. The present work examines the characterisation of the state of microstructure and its evolution during thermal treatment of Bi2Sr2Ca1Cu2O8. The dilatometric analysis was used to study the shrinkage mechanism during sintering. The microstructure of the sintered samples was characterised in terms of pores distribution and apparent density. Open porosity was measured by mercury porosimeter. In order to compare the results, ultrasonic characterisation such as the longitudinal and transverse wave velocities in the ceramic was carried out. From an ultrasonic point of view, these microstructural features act as inhomogeneities and the ultrasonic parameters will depend on the geometrical arrangement of microstructure (pores have an effect both on Young's modulus and attenuation). Springer Science+Business Media, LLC, 2007 Chakri Nasr-Eddine Laboratoire LEREC, Département de Physique, Faculté des Sciences, Université Badji-Mokhtar Annaba, 23220, Sidi-Amar, Annaba, Algeria aut Benaldjia Abdelaziz Laboratoire LEREC, Département de Physique, Faculté des Sciences, Université Badji-Mokhtar Annaba, 23220, Sidi-Amar, Annaba, Algeria aut Amara Abdelaziz Laboratoire LEREC, Département de Physique, Faculté des Sciences, Université Badji-Mokhtar Annaba, 23220, Sidi-Amar, Annaba, Algeria aut Benloucif Mohamed Laboratoire LEREC, Département de Physique, Faculté des Sciences, Université Badji-Mokhtar Annaba, 23220, Sidi-Amar, Annaba, Algeria aut Guerioune Mohamed Laboratoire LEREC, Département de Physique, Faculté des Sciences, Université Badji-Mokhtar Annaba, 23220, Sidi-Amar, Annaba, Algeria aut Journal of Materials Science Springer US; http://www.springer-ny.com 42/10(2007-05-01), 3419-3424 0022-2461 42:10<3419 2007 42 10853 https://doi.org/10.1007/s10853-006-1201-6 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10853-006-1201-6 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Chakri Nasr-Eddine Laboratoire LEREC, Département de Physique, Faculté des Sciences, Université Badji-Mokhtar Annaba, 23220, Sidi-Amar, Annaba, Algeria aut NATIONALLICENCE 700 1- Benaldjia Abdelaziz Laboratoire LEREC, Département de Physique, Faculté des Sciences, Université Badji-Mokhtar Annaba, 23220, Sidi-Amar, Annaba, Algeria aut NATIONALLICENCE 700 1- Amara Abdelaziz Laboratoire LEREC, Département de Physique, Faculté des Sciences, Université Badji-Mokhtar Annaba, 23220, Sidi-Amar, Annaba, Algeria aut NATIONALLICENCE 700 1- Benloucif Mohamed Laboratoire LEREC, Département de Physique, Faculté des Sciences, Université Badji-Mokhtar Annaba, 23220, Sidi-Amar, Annaba, Algeria aut NATIONALLICENCE 700 1- Guerioune Mohamed Laboratoire LEREC, Département de Physique, Faculté des Sciences, Université Badji-Mokhtar Annaba, 23220, Sidi-Amar, Annaba, Algeria aut NATIONALLICENCE 773 0- Journal of Materials Science Springer US; http://www.springer-ny.com 42/10(2007-05-01), 3419-3424 0022-2461 42:10<3419 2007 42 10853 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer