Journal ArticleDOI
Effects of lithium oxide on the electrical properties of CuO at low temperatures
F. Lanza,R. Feduzi,J. Fuger +2 more
TLDR
In this paper, the influence of four dopant lithium concentrations on the electrical properties of CuO was investigated, showing an initial strong decrease of the conduction activation energies for small contents of Li (<1.7 at. %), which becomes weak for larger contents.Abstract:
We present an investigation of the influence of four dopant lithium concentrations on the electrical properties of CuO. X-ray measurements have revealed a single phase formed up to 4.2 at. % of Li, and a second phase formed, Li2CuO2, in the case of 10.5 at. % of Li concentration. The log(ρ/T) vs 1/T data are better represented by two straight lines than by one and show an initial strong decrease of the conduction activation energies for small contents of Li (<1.7 at. %), which becomes weak for larger contents. The change in slope observed in the resistivity measurements as a function of temperature has also been investigated by calorimetric measurements, revealing a specific heat anomaly which can be associated with the antiferromagnetic order transition.read more
Citations
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CuO Nanowires Can Be Synthesized by Heating Copper Substrates in Air
TL;DR: In this article, a vapor phase approach to the facial synthesis of cupric oxide (CuO) nanowires supported on the surfaces of various copper substrates that include grids, foils, and wires was described.
Journal ArticleDOI
Hydrogen from photo-catalytic water splitting process: A review
TL;DR: The role of methanol and several recent achievements by previous researchers have also been included in this article, where modification techniques that can be used to improve the drawbacks of TiO 2, such as the addition of sacrificial agents into the solution are presented.
Journal ArticleDOI
Formation of Uniform CuO Nanorods by Spontaneous Aggregation: Selective Synthesis of CuO, Cu2O, and Cu Nanoparticles by a Solid−Liquid Phase Arc Discharge Process
TL;DR: Uniform and monodisperse CuO nanorods have been synthesized by directional aggregation and crystallization of tiny CuO nanoparticles generated from a solid-liquid arc discharge process under ambient conditions in the absence of any surfactants.
Journal ArticleDOI
Fabrication of CuO pricky microspheres with tunable size by a simple solution route
TL;DR: The effects of the molar ratios of tartrate anions and NaOH to Cu(2+) cations, reagent concentration, and reaction temperature on the products were investigated, showing that the morphology of CPMs was determined by the molars ratio of Tartrate to Cu (2+)cations and the size was greatly affected by reagent concentrations.
Journal ArticleDOI
Synthesis of Different Cu(OH)2 and CuO (Nanowires, Rectangles, Seed-, Belt-, and Sheetlike) Nanostructures by Simple Wet Chemical Route
TL;DR: In this paper, the reduction of aqueous solution of copper nitrate (Cu(NO3)2 = 0.2 M) with different molar concentrations of NaOH solution and the synthesized nanomaterials get transformed into different nanostructures of CuO by subsequent heat treatment at 80 °C for half an hour.
References
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Journal ArticleDOI
Possible high Tc superconductivity in the Ba-La-Cu-O system
TL;DR: In this paper, Ba−La−Cu−O system, with the composition BaxLa5−xCu5O5(3−y) have been prepared in polycrystalline form, and samples with x=1 and 0.75,y>0, annealed below 900°C under reducing conditions, consist of three phases, one of them a perovskite-like mixed-valent copper compound.
Journal ArticleDOI
Superconductivity at 93 K in a new mixed-phase Y-Ba-Cu-O compound system at ambient pressure
Maw-Kuen Wu,J. R. Ashburn,C. J. Torng,Pei-Herng Hor,R. L. Meng,Li Gao,Z. J. Huang,Yongmei Wang,Ching-Wu Chu +8 more
TL;DR: A stable and reproducible superconductivity transition between 80 and 93 K has been unambiguously observed both resistively and magnetically in a new Y-Ba-Cu-O compound system at ambient pressure.
Journal ArticleDOI
A New High-TcOxide Superconductor without a Rare Earth Element
TL;DR: In this paper, a new high-Tc oxide superconductor of the BiSrCa-Cu-O system without any rare earth element was discovered, which has Tc of about 105 K, higher than that of YBa2Cu3O7 by more than 10 K.