29 Result(s)

Article

Improved Magnetization for YBa₂Cu₃O_7-δ Annealed in Oxygen Above 1000°C

Air sintering and subsequent oxygen annealing at high temperatures are integral to the production of ceramic superconducting YBa₂Cu₃O_7-δ. We present results directed toward optimizing the temperature for these tw...

E. L. Venturini, D. S. Ginley, R. J. Baughman, B. Morosin… in MRS Online Proceedings Library (1987)

Article

Origin of Paramagnetic Defect in Single Crystal and Ceramic B₄C

We compare electron spin resonance (ESR) spectra of B₄C samples made by three methods. The samples are 1) two ceramics made by hot-pressing boron and carbon powders, 2) a polycrystal made by carbothermic reductio...

E. L. Venturini, D. Emin, T. L. Aselage in MRS Online Proceedings Library (1987)

Article

Bulk Ceramic and Screen Printed EuBa₂Cu₃O_7-δ

The structural, magnetic and electrical properties of EuBa₂Cu³O_7-δ have been investigated both for bulk ceramics and screen printed thick films. The bulk ceramic reaches zero resistance at 92 K, and has large int...

W. S. Fu, D. S. Ginley, M. A. Mitchell, E. L. Venturini… in MRS Online Proceedings Library (1987)

Article

Freestanding Films of YBa₂cu₃O_6.9

Thick (20–300 /im) freestanding films of ceramic YBa₂Cu₃O_0–9 have been obtained by resintering YBa₂Cu₃O_0–9 powder in air after screen printing onto fused silica substrates. An interfacial reaction occurs between ...

D. S. Ginley, M. A. Mitchell, W. Fu, J. F. Kwak… in MRS Online Proceedings Library (1987)

Article

Bulk Superconductivity in La₂CuO₄

J. E. Schirber, E. L. Venturini, B. Morosin, J. F. Kwak… in MRS Online Proceedings Library (1987)

Article

Reoxygenation of vacuum-annealed YBa₂Cu₃O_6.9

Vacuum-annealed samples of single-phase orthorhombic YBa₂Cu₃O_6.9 have been reoxygenated. The vacuum-annealed material is tetragonal, semiconducting at room temperature, and shows no superconductivity. Upon anneal...

D. S. Ginley, P. J. Nigrey, E. L. Venturini, B. Morosin… in Journal of Materials Research (1987)

Article

Variation of the pressure dependence of the superconducting transition temperature with x in La_1−xSr_x CuO₄

Hydrostatic pressure measurements of the superconducting transition temperature were made as a function of x in La_2−xSr_x CuO₄. A sharp change in the behavior occurs between x = 0.2 and 0.25 in that the pressure d...

J. E. Schirber, E. L. Venturini, J. F. Kwak, D. S. Ginley… in Journal of Materials Research (1987)

Article

Metallic Microwave Conductivity in Shock-Loaded Rutile

Electron spin resonance (ESR) has been used to characterize the paramagnetic defects present in both single crystal and powder rutile (TiO₂) subjected to explosive shock loading and preserved for post-shock study...

E. L. Venturini, R. A. Graham in MRS Online Proceedings Library (1983)

Article

Transmission Electron Microscopy of Shock-Modified and Annealed Rutile

The annealing behavior of shock modified rutile (TiO₂) powder was studied by transmission electron microscopy, x-ray line broadening, and electron spin resonance. Specimens were examined in the as-received and as...

M. J. Carr, R. A. Graham, B. Morosin, E. L. Venturini in MRS Online Proceedings Library (1983)