Fracture strength properties of Gd-Ba-Cu-O large single-grain bulk with CeO2 addition

Fracture strength and Young's modulus in a GdBa2Cu3Oy based large single-grain bulk were evaluated through three- and fourpoint bending tests of specimens cut from the bulk. The diameter of the bulk was about 150 mm. The bulk was fabricated in air. Scatter of the bending strength data in the bulk was mainly attributable to dispersion of pores. There was no significant difference in the bending strength value among the bending test specimens cut from inner region of the bulk. The bending strength of the large single-grain bulk was comparable to that of a smaller GdBa2Cu3Oy bulk.