[CCoE Notice] MS Thesis Presentation

[Abercrombie, Irene F]

MS Thesis Defense

STUDY OF STRUCTURE, COMOPOSITION AND ELECTROMAGNETIC PROPERTIES OF HIGH LEVELS
OF Zr-DOPED REBa2Cu3O7-x TAPES FABRICATED BY METAL ORGANIC CHEMICAL VAPOR DEPOSITION

Yuhao Liu

Date:  Monday, August 5th,  2013

Location: Mechanical Engineering (large) Conference Room
Time: 10:00 AM

Committee Chair:
Dr. Venkat Selvanamickam

Committee Chair:
Dr. Haleh Ardebili
Dr. Jiming Bao
Dr. Jae-Hyun Ryou



In this thesis the critical currents (Ic), structural properties and composition variations of Zr-doped (Gd,Y)Ba2Cu3Ox (GdYBCO) superconducting tapes fabricated by metal organic chemical vapor deposition (MOCVD) were studied. By a modified MOCVD process, the self-field critical currents at 77K of GdYBCO with high Zr doping levels have been enhanced significantly. The in-field performances of critical currents of GdYBCO tapes with Zr-doping levels of 7.5-30 at.% were investigated up to 5 T over a temperature range of 40 K - 77 K. The tape with 20% Zr doping is found to have the highest minimum critical currents and the highest critical currents in orientation of the field perpendicular to the c-axis (H||c) over a wide range of temperatures and magnetic fields. The electromagnetic properties have been related to the microstructure changes. For finding out the optimal film composition with the best in-field performance at 30K, 3T, the influence of composition on in-field performance has also been studied.

-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://Bug.EGR.UH.EDU/pipermail/engi-dist/attachments/20130805/eeb97934/attachment.html