Presentation Information
[19a-C501-6]Study on crystal structures in DyBa2Cu3O7-δ powder by in-situ X-ray diffraction measurements under modulated rotating magnetic fields
Shintaro Adachi1, 〇Fumiko Kimura1, Shigeru Horii1 (1.KUAS)
Keywords:
magnetic anisotropy,superconducting ceramic,twin crystal structure
The superconducting properties of DyBa2Cu3O7-δ (Dy123, 0≤δ≤1), a superconducting ceramic with a high critical temperature, are sensitive to oxygen content. After the synthesis of the Dy123 phase, it becomes orthorhombic with δ ≈ 0 in the process of oxygen annealing (300 to 450°C). The orthorhombic Dy123 has a twin structure in the ab plane. When changing from tetragonal to orthorhombic, the crystal has a twin structure so as to minimize strain energy, i.e., to minimize grain deformation due to length changes in the a and b axis directions. That is, a twin crystal structure is formed with the (110) plane.
In this study, using Dy123 with different cooling processes and oxygen-annealed Dy123, we investigated the formation of the twin structure from the magnetic anisotropy.
In this study, using Dy123 with different cooling processes and oxygen-annealed Dy123, we investigated the formation of the twin structure from the magnetic anisotropy.