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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...
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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...
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Article
Variation of the pressure dependence of the superconducting transition temperature with x in La1−xSrx CuO4
Hydrostatic pressure measurements of the superconducting transition temperature were made as a function of x in La2−xSrx CuO4. A sharp change in the behavior occurs between x = 0.2 and 0.25 in that the pressure d...
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Article
Reoxygenation of vacuum-annealed YBa2Cu3O6.9
Vacuum-annealed samples of single-phase orthorhombic YBa2Cu3O6.9 have been reoxygenated. The vacuum-annealed material is tetragonal, semiconducting at room temperature, and shows no superconductivity. Upon anneal...
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Article
Improved Magnetization for YBa2Cu3O7-δ Annealed in Oxygen Above 1000°C
Air sintering and subsequent oxygen annealing at high temperatures are integral to the production of ceramic superconducting YBa2Cu3O7-δ. We present results directed toward optimizing the temperature for these tw...
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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...
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Article
Bulk Ceramic and Screen Printed EuBa2Cu3O7-δ
The structural, magnetic and electrical properties of EuBa2Cu3O7-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...
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Article
Freestanding Films of YBa2cu3O6.9
Thick (20–300 /im) freestanding films of ceramic YBa2Cu3O0–9 have been obtained by resintering YBa2Cu3O0–9 powder in air after screen printing onto fused silica substrates. An interfacial reaction occurs between ...
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Article
Bulk Superconductivity in La2CuO4
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Article
Chemical Preparation of Powders and Films for High Temperature Superconductors
A precipitation process has been developed to prepare precursor powders which can be calcined and sintered to form high critical temperature superconductors such as YBa2Cu3O7−x. Precursor powders are prepared usi...
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Article
Synthesis and Properties of YBaSrCu3O6.9 Prepared from Soluble Precursors
Solution chemistry routes have been used to prepare single-phased superconducting ceramics of YBaSrCu3O6.9 (1113). Resistivity measurements on air annealed samples showed a superconducting onset temperature of 85...
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Article
Freestanding thick films of YBa2Cu3O6.9 by screenprinting techniques
Thick (20–300 μm) freestanding polycrystalline films of ceramic YBa2Cu3O6.9 have been obtained by resintering YBa2Cu3O6.9 powder in air after screen printing onto fused silica substrates. An interfacial reaction ...
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Article
Annealing and Strain Effects on Tl-Ba-Ca-Cu-O Crystals and Ceramics
Superconducting transition temperatures (Tc’S) in the Tl-Ba-Ca-Cu-O system are shown to be a function of processing for both single crystals and bulk ceramics. Crystals with the identical structural phase and nom...
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Article
Cation Disordering in the Tl-2122 Superconductors
We have examined several crystals belonging to the Tl-2122 structure type (Tl2CaBa2Cu2O8 with c=29Å), and have shown that cation solid solution occurs. Such cation disorder appears to be responsible for the obser...
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Article
Superconductivity and Stoichiometry in Tl2Ca2Ba2Cu3Ox Single Crystals
Magnetization and resistivity data are presented which show a substantial difference in superconducting transitions for nominal Tl2Ca2Ba2Cu3Ox plates with identical crystal structures grown from two different “me...
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Article
Ion-Irradiation Effects in Tl2Ca2Ba2Cu3010 Superconductors
The effects of oxygen and helium ion irradiation on the superconducting properties of Tl2Ca2Ba2Cu3010 thin films were investigated. The transition temperature and width were monitored as a function of ion fluence...
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Article
Novel Processing of Hts Based Conductors
Conductor development is one of the major long term goals in high temperature superconductor research. In this paper we report on two promising processing technologies that have been utilized to produce superc...
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Article
Rapid Thermal Processing Of High Temperature Superconducting Fiber
We report on the rapid thermal processing (RTP) of YBa2Cu3O7 (Y-123) fibers. Unsintered fibers are densified by RTP. We show that fibers which were originally semiconducting and tetragonal before RTP form normal ...
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Article
Tl-Based Films: A Comparison of Processing Procedures
The structural, electrical and magnetic properties are compared for three superconducting Tl-Ca-Ba-Cu-O thin films prepared by different deposition and sintering protocols. One film containing a mixture of Tl2Ca2
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Article
Structural studies on Tl–Ca–Ba–Cu−0 superconducting thin films
The microstructure of mixed phase, c-axis oriented Tl–Ca–Ba–Cu–O thin films, exhibiting excellent superconducting properties, has been examined by transmission electron microscopy and x-ray diffraction. Although ...