Enhanced Superconducting Properties in Bi2Sr2Ca1Cu1.75Na0.25Oy Ceramics Prepared by Hot-Pressing Under Different Pressures and Temperatures. - Öner, Bulut; Özkurt, Pinar; Madre, M. A.; Özkurt, Berdan; Sotelo, A. (Journal of Superconductivity & Novel Magnetism, 2022)