Abstract
Thermal instability of crystal structure, electric and magnetic properties in oxygen reduced YBa2Cu3O6.4 has been studied by powder X-ray diffraction, dc electrical resistivity and ac magnetic susceptibility measurements. The X-ray measurements revealed that the original orthorhombic phase gradually transforms with increasing annealing temperature to a new phase which has a super structure with a doubled unit cell along the c-axis. The transformation was accompanied by metal to semiconductor-like transition. A magnitude of diamagnetic susceptibility was decreased by annealing. The phenomena show that the new phase has a semiconducting nature. It was also noted that the transformation proceeds with oxygen absorption.
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