123 Result(s)
within
X. X. **e
Materials Science
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Article
Ion Beam Modification of High-Tc Superconductors
Ion irradiation and implantation experiments of high temperature superconductors (HTSC) thin films resulted in many interesting effects. Among those are: (i) the superlinear increase of the resistivity, p, wit...
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Article
High Critical Current Density in Ultrathin Ybco Films
Measurements of the critical current density Jc for ultrathin YBa2Cu307-X (YBCO) films are presented.A high Jc value at 77K in zero field of 2xl06A/cm2 was obtained in a 30nm thick film and even a 5nm thick film ...
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Article
Fabrication of Yy-Pr1-y -Ba-Cu-O Thin Films and Superlattices of -Ba-Cu-O/Yy-Pr1-y -Ba-Cu-O
We have prepared epitaxial thin films of Yy-Pr1-y-Ba-Cu-O (y= 1 to 0) and superlattices of Y-Ba-Cu-O/Yy-Pr1-y -Ba-Cu-O using pulsed laser deposition technique. The zero resistance transition temperatures of Yy-Pr
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Article
High Rate Growth of YBa2Cu3O7-x Thin Films using Pulsed Excimer Laser Deposition
We report here on the pulsed laser deposition of high quality, superconducting, 200 nm thick films of YBa2Cu3O7-x at rates approaching 15 nm/s. Film crystallinity and electrical properties were studied as a funct...
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Article
Laser Deposition of High Tc Superconducting thin Films: Present and Future
Pulsed laser deposition (PLD) has been widely used for deposition of high Tc superconducting thin films, and is recognized as one of the best physical vapor techniques for the preparation of these films. The most...
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Article
The atomic structure of growth interfaces in Y–Ba–Cu–O thin films
We have examined the atomic structure of growth interfaces in thin films of Y–Ba–Cu–O grown on [001] perovskite or cubic substrates. At substrate heater temperatures in the range of 780–820 °C c-axis oriented ...
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Chapter
SiC Particle and Y-TZP Reinforced Mullite Matrix Composites
Mullite(M) matrix composites reinforced by both SiC particles(P) and Y-TZP(yttria stabilized tetragonal zirconia polycrystal) were fabricated by hot-pressing. The relationship between microstructure and proper...
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Chapter
Pulsed Laser Deposited Metal-Oxide Based Superconductor, Semiconductor and Dielectric Heterostructures and Superlattices
In this article we will review some of the recent advances made at the University of Maryland Center for Superconductivity Research in the field of pulsed laser deposited heterostructures and superlattices mad...
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Article
Effect of substrate materials on laser deposited Nd1.85Ce0.15CuO4−y films
The growth morphology and interface structure of Nd1.85Ce0.15CuO4−y (NCCO) films grown by pulsed laser deposition on two different types of substrates, “perovskite” LaAlO3 (LAO) and SrTiO3 (STO) and “fluorite” Y2
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Article
Study of Amorphous Silicon Nitride films by Brillouin Spectroscopy
The elastic properties of hydrogenated silicon nitride (a-SiNx:H) films, with x=1, have been investigated by means of the Brillouin light scattering technique. The films were deposited on an opaque substrate (sil...
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Article
Microwave Sintering of Zirconia Toughened Mullite (ZTM)
Microwave sintering of zirconia toughened mullite (ZTM) has been performed in a single mode applicator. In comparison with conventional sintering, microwave processing of ZTM leads to a higher density and fine...
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Article
Tetragonal and orthorhombic prototype phase structures in the homologous series of pure and Pb-doped HgBa2Ca2Cu3O8+δ superconductors
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Article
NTO Decomposition Studies
To examine the thermal decomposition of 5-nitro-2,4-dihydro-3H-1,2,4-triazol-3-one (NTO) in detail, isotopic labeling studies were undertaken. NTO samples labeled with 15N in three different locations [N(1) and N...
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Article
Silicon carbide-toughened zirconia ceramics
Tetragonal zirconia polycrystalline (TZP) ceramics containing SiC reinforcement in the form of fine particles (nano-scale), particles (micro-scale), whiskers and platelets were synthesized by hot-pressing. The...
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Article
Toughening mechanisms and properties of mullite matrix composites reinforced by the addition of SiC particles and Y-TZP
Mullite matrix composites reinforced by SiC particles and Y-TZP, were fabricated by hot-pressing. The effects of adding SiC particles and Y-TZP to mullite or mullite-based materials on properties and toughenin...
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Article
Growth of highly oriented (Hg, Pb)-based superconducting thin films on LaAlO3 substrates by pulsed-laser ablation
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Article
Gamma prime (γ′) precipitating and ageing behaviours in two newly developed nickel-base superalloys
Two cast nickel-base superalloys with superior creep rupture lives at high temperatures and high stresses were developed. In the present study, the microstructural characteristics of γ′-precipitates and the ha...
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Article
Growth of highly oriented (Hg,Pb)-based superconducting thin films on LaAlO3 substrates by pulsed laser ablation
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Article
Scanning electron acoustic microscopy for the evaluation of domain structures in BaTiO3 single crystal and ceramics
As a non-destructive and subsurface detecting technique, the scanning electron acoustic microscopy (SEAM) method has been applied to study the ferrodomain structures in ferroelectric BaTiO3 single crystal and ...
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Article
Dielectric Properties of Pulsed Laser Deposited SrTiO3 Thin Films
Low frequency dielectric loss and nonlinearity in pulsed laser deposited SrTiO3 thin films were studied. A low loss tangent in the order of 10−4, close to the level found in SrTiO3 single crystals, was observed. ...
