Formation and Thermal Stability of High-<i>T</i>_c Phase in Te-Doped Bi-Based Superconducting Glass-Ceramics

Investigating the Preparation Conditions on Superconducting Properties of Bi&lt;SUB&gt;2-x&lt;/SUB&gt; Li&lt;SUB&gt;x&lt;/SUB&gt;Pb&lt;SUB&gt;0.3&lt;/SUB&gt;Sr&lt;SUB&gt;2&lt;/SUB&gt;Ca&lt;SUB&gt;2&lt;/SUB&gt;Cu&lt;SUB&gt;3&lt;/SUB&gt;O&lt;SUB&gt;10+δ&lt;/SUB&gt;

“…It can be easily inferred that both the δ and T C increased, with increasing x to 0.2 and 0.3, then reduced for further increasing of substitution similar behavior of oxygen content with the transition temperature for for Bi 1.6 Pb 0.4 Sr 2 Ca 3 Cu 4 O 10+δ system was indicated by Zhao et al [26]. This apparently it is due to Bi replacement by Li ion, so the presence of excess oxygen atoms in the CuO 2 layers will create more holes in the perovskite layers, the creation of holes will shorten the Cu-O 2 bond length and this leads to an improvement of the T C [8] [27].…”