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Article
Bismuth titanium indium antimony oxide: A low-temperature-coefficient, high-K dielectric material
The 1 MHz dielectric properties for mixed-phase polycrystalline ceramics in the system Bi4Ti3O12–Bi(InxSb1x)O3 were reported. In the vicinity of ambient temperature, the dielectric constants for the Sb and In end...
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Article
Synthesis and Properties of Epitaxial Thin Films of c-axis Oriented Metastable Four-Layered Hexagonal BaRuO3
We have grown epitaxial thin films of metastable four-layered hexagonal (4H) BaRuO3 on (111) SrTiO3 by 90δ off-axis sputtering techniques. X-ray diffraction and transmission electron microscopy experiments reveal...
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Article
Advances in GaAs Mosfet’s Using Ga2O3(Gd2O3) as Gate Oxide
In this article, we review the recent progress on GaAs MOSFET’s using in-situ MBE-grown Ga2O3(Gd2O3) as the gate dielectric. Both depletion-mode (D-mode) and inversion-mode (I-mode) GaAs MOSFET’s with negligible ...
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Article
Effect of Lattice Strain on Growth Mechanisms and Electrical Transport Behavior of Epitaxial CaRuO3 Thin Films
We have observed both metallic and semiconducting behavior in epitaxial thin films of the metallic oxide CaRuO3 deposited under identical conditions on (100) SrTiO3 substrates of varying crystalline quality. X-ra...
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Article
Crystal structure of Y0.95Ca0.05CuO2.54: A new oxygen-deficient perovskite chemically and structurally related to the “123” superconductor
The crystal structure of Y0.95Ca0.05CuO2.54(1) has been determined by neutron powder diffraction at room temperature. The compound crystallizes with the symmetry of the hexagonal space group P63/m and lattice par...
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Article
Dielectric properties of barium titanium niobates
The results of measurements of dielectric constants, in the vicinity of ambient temperature, are presented for eight barium titanium niobium oxides (BaTi1+2nNb4O13+4n for n = 0, 1, 2, 3, 4; Ba3Ti4Nb4O21, Ba3Ti5Nb
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Article
Ln3Cu4P4O2: a New Lanthanide Transition Metal Pnictide Oxide Structure Type
A new type of lanthanide transition metal pnictide-oxide, Ln3Cu4P4O2 (for Ln = La, Ce, and Nd), is reported. The crystal structure is made from Ln2O2 layers of the Pb2O2 type stacked with layers of Cu2P2 tetrahed...
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Article
Dielectric properties of TiO2–Nb2O5 crystallographic shear structures
The dielectric constants (K) have been measured near ambient temperature for polycrystalline bulk ceramics of the crystallographic shear compounds TiNb24O62, Ti2Nb10O29, and TiNb2O7. These show enhanced K’s over ...
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Article
Enhancement of the dielectric constant of Ta2O5through substitution with TiO2
MICROELECTRONICS research is in large part driven by the demand for smaller components with enhanced performance. For capacitive components, which form the basis of many memory devices, the dielectric constant...
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Chapter and Conference Paper
Physical Properties of the New Borocarbide Superconductors
An overview is given on materials and physical properties of the recently discovered 20K-class layered borocarbide intermetallic superconductors, RETM2B2C (RE=rare-earth, TM=Ni, Pd, Pt). Extensive studies on Lu(Y...
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Article
Neutron Powder Diffraction Refinement of the Nuclear and Magnetic Structures of HoNi2B2C at R.T., 10, 5.1 AND 2.2 K
The nuclear and magnetic structures of HoNi2B2C have been investigated by neutron powder diffraction at room temperature and at 10, 5.1 and 2.2K. The compound crystallizes with the symmetry of space group 14/mmm ...
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Article
Transparent Conducting Films Grown By Pulsed Laser Deposition
We have studied the properties of two types of transparent conducting oxides grown by pulsed laser deposition (PLD) on quartz substrates. We have grown films of ITO with resistivity as low as 250 μΩ-cm and wit...
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Article
Superconductivity in lanthanum nickel boro-nitride
RESEARCH into intermetallic superconductors has recently been reinvigorated by the discovery of superconductivity at 23 K in a Y–Pd–B–C quaternary alloy1 (tying with the long-standing inter-metallic record held b...
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Article
Electrochemical and high pressure superoxygenation of YCuO2+x and LaCuO2+x delafossites
Electrochemical and high pressure oxygenation experiments are described which extend the range of intercalated oxygen content beyond that accessible in 1 atm O2 treatments for the triangular planar cuprate delafo...
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Article
Superconductivity at 23 K in yttrium palladium boride carbide
COPPER oxide compounds have dominated superconductivity research since 1986 because of their very high transition temperatures (Tcs). In contrast, no new families of high-Tc intermetallic compounds have been disc...
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Article
The crystal structure of superconducting LuNi2B2C and the related phase LuNiBC
SUPERCONDUCTING intermetallic compounds with relatively high transition temperature (Tc) have been found in the systems Ln–Tr–B–C, where Ln is a lanthanide element (Y, Ho–Lu) and Tr a transition metal (Pd or Ni)1...
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Article
Superconductivity in the quaternary intermetallic compounds LnNi2B2C
THE attainment of unprecedentedly high transition temperatures (Tcs) in the copper oxide superconductors illustrates how working with more complex chemical systems allows greater opportunity to balance opposing f...
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Article
Antiferromagnetism and metallic conductivity in Nb12O29
AT the heart of the controversy about the microscopic origin of superconductivity in high-transition-temperature copper oxide superconductors is the question of whether or not the antiferromagnetism associated...
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Article
Superconductivity at 60 K in La2-xSrxCaCu2O6: the simplest double-layer cuprate
STARTING with the pioneering work of Bednorz and Müller1, many copper-oxide-based superconductors with high transition temperatures (Tc) have been discovered. All contain layers of copper-oxygen squares, pyramids...
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Article
Residence times and coverage by surface intermediates during the Fischer-Tropsch synthesis
Isotope tracing of alkene readsorption has been used to examine reversibility in the growth of higher hydrocarbons in the Fischer-Tropsch synthesis. Some reversibility is indicated, but the degree is insuffici...