%0 Journal Article %K Superconducting transition temperature %K Oxide superconductors %K Microscopic Examination–Transmission Electron Microscopy %K Metallography–Microstructures %K Superconducting Materials–Annealing %K Oxygen Annealing Effects %K Sintered Superconductor Alloys %K Twinned Orthorhombic Phase %K Vacuum Annealing Effects %K Gadolinium Barium Copper Alloys %A Ramamoorthy Ramesh %A G Thomas %A R.L Meng %A P.H Hor %A C.W Chu %B Journal of Materials Research %D 1989 %G eng %P 515-520 %R 10.1557/JMR.1989.0515 %T Electron microscopy of a Gd-Ba-Cu-O superconductor %V 4