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We have melt quenched a series of Ga substituted Bi 2−x Ga x Sr 2 Ca 2 Cu 3 O 10+y samples with the compositions with x = 0.2, 0.4, 0.6, 0.8 and 1.0. Microstructure, thermal properties including crystallization activation energy, magnetic and superconducting properties were investigated. We have found that Ga 3+ ions have a solid solubility limit in the BSCCO system and this limit was passed at x = 0.6. Below this limit HT c BSCCO n = 3 phase was obtained, but after the solid solubility limit samples yield multiphase superconducting properties. Extended heat treatment at 840 • C displayed no suppression of the solid solubility limit. The crystallization kinetic studies were investigated using non-isothermal kinetic models of Kissinger and Augis-Bennet. Higher crystallization activation energies, E a , were obtained compared to unsubstituted BSCCO materials, glassification improved and glass handling time increased. The substitution had a slight effect on J c , the flux pinning in the material was improved and better J c values were obtained below the solid solubility limit.

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