1. Thermomechanical Processing of High T c Superconducting Wire Super BSCCO Family C. Bjelkengren B. Cooper Y. King S. Maltas

2. Super BSCCO Family 2 Superconductivity Review High Tc Superconduction originates from crystal structure  Highly anisotropic (superconduction along Cu-O planes)  Maintain grain/Cu-O plane alignment to maximize superconduction Cu 3+ valence states lead to partly filled energy bands  Oxidation to Cu 3+ leads to p-type conductivity  Weak localization of valence electrons (low ionic character)  Alkaline and rare earth metals act as charge reservoirs

3. Super BSCCO Family 3 Basic Plan and Time Line Improve the superconductivity through various thermomechanical processes to align grains and Cu-O planes Week 1-3: Characterization of BSCCO Tape Week 4-8: Investigation of Thermomechanical Processes Week 9-14: Improving Superconductivity/Working on Prototype

4. Super BSCCO Family 4 Weeks 1-3 Characterization of BSCCO Tape  Preparation of Samples: long/short transverse, filet  Light Microscopy: structural observations  Scanning Electron Microscopy: qualitative microstructural observations  Differential Scanning Calorimetery: phase transition identification  Critical Current Measurement: initial property characterization  X-ray Analysis: Lotgering factor - quantitatively measures texture by the intensity of the 2  peaks where 0=completely random and 1=completely textured

5. Super BSCCO Family 5 Sample Preparation Characterization of BSCCO Tape  Preparation of Samples in Epoxy: Short transverse |||||| Long transverse |||||| Filet |||||| Polished to expose BSSCO.

6. Super BSCCO Family 6 Samples: Short Transverse Cut Sample in Epoxy and Coated in Gold (for SEM) Long Transverse Cut Sample in Epoxy and Coated in Gold (for SEM) Filet Cut Sample in Epoxy

7. Super BSCCO Family 7 Light Microscopy: Structural observations ST 165x ST 330x

8. Super BSCCO Family 8 Light Microscopy: Structural observations LT 660x Fillet 165x

9. Super BSCCO Family 9 Scanning Electron Microscopy Qualitative Microstructural Observations ST 420x LT 420x

10. Super BSCCO Family 10 Differential Scanning Calorimetery Phase Transition Identification -170 deg C to 300 deg C @ 20 C/min 200 deg C to 600 deg C @ 20 C/min

11. Super BSCCO Family 11 Work Today  Critical Current Measurement: initial property characterization Setup Built and Ready for Testing  X-ray Analysis: Lotgering factor - quantitatively measures texture by the intensity of the 2  peaks where 0=completely random and 1=completely textured Samples Polished and Ready for Testing

12. Super BSCCO Family 12 In the Next Few Weeks… Investigation effects of thermomechanical processes on superconductivity  Cold Deformation: rolling, suspend under tension  Heat Treatment: 150 – 800 o C  Uniaxial Hot Deformation  Hot Isotactic Pressing  Directional Graingrowth: temperature gradient

13. Super BSCCO Family 13 Improving Superconductivity  Defined Processing Sequence  Determine Optimal Processing Variables: T, t, P  Measure of Success I c, x-ray, SEM Quantitative: I c = 150 kA, Improve Lotgering Factor Qualitative: SEM

14. Super BSCCO Family 14 Areas of Further Research Research Thermomechanical Processes Research Prototype Ideas Locate Resource Facilities  Cold Deformation  Heat Treatment  Uniaxial Hot Deformation  Hot Isotactic Pressing  Directional Graingrowth