Solvothermal Synthesis of Multifunctional Coordination Polymers
... procedure of compounds 5 – 8 is described below. The mixture of MX 2 (X = Br or Cl), oxalic acid and bpy in the molar ratio of 1 : 1 : 1 in 4 mL of H2 O (8 mL for Zn) was sealed in a 23 mL acid digestion bomb and heated at 170 ◦C for 7 d. The crystals of the product were isolated by filtration and w ...
... procedure of compounds 5 – 8 is described below. The mixture of MX 2 (X = Br or Cl), oxalic acid and bpy in the molar ratio of 1 : 1 : 1 in 4 mL of H2 O (8 mL for Zn) was sealed in a 23 mL acid digestion bomb and heated at 170 ◦C for 7 d. The crystals of the product were isolated by filtration and w ...
STUDY OF ULTRA-STRONG MAGNETIC PROPERTIES OF
... An amorphous alloy of composition Nd4Fe76Cu 0.5Nb1B18.5 prepared by melt spinning technique at wheel speed of 25 m/s in an argon atmosphere has been studied to observe their ultra-hard magnetic properties. In the as-prepared condition sample was in fully amorphous state as has been revealed by X-ray ...
... An amorphous alloy of composition Nd4Fe76Cu 0.5Nb1B18.5 prepared by melt spinning technique at wheel speed of 25 m/s in an argon atmosphere has been studied to observe their ultra-hard magnetic properties. In the as-prepared condition sample was in fully amorphous state as has been revealed by X-ray ...
view - The Long Group - University of California, Berkeley
... formula FexZn3–x(HCOO)6 have been synthesized with x = 0.26, 1.03, 1.78, 2.22, and 2.43. Upon increasing the diamagnetic component Zn, the series exhibits systematic changes from long-range three-dimensional ordering to spin glass to superparamagnet or possible single-molecule magnet (a large freque ...
... formula FexZn3–x(HCOO)6 have been synthesized with x = 0.26, 1.03, 1.78, 2.22, and 2.43. Upon increasing the diamagnetic component Zn, the series exhibits systematic changes from long-range three-dimensional ordering to spin glass to superparamagnet or possible single-molecule magnet (a large freque ...
Thermally Driven Crossover from Indirect toward Direct Bandgap in
... without any need for a phonon-assisted process. The abnormal increase in PL intensity at high temperatures, on the other hand, cannot be attributed to Boltzmann tailing of equilibrium electrons populating the conduction and valence bands at the K point where the direct bandgap occurs. This is becaus ...
... without any need for a phonon-assisted process. The abnormal increase in PL intensity at high temperatures, on the other hand, cannot be attributed to Boltzmann tailing of equilibrium electrons populating the conduction and valence bands at the K point where the direct bandgap occurs. This is becaus ...
The physics of manganites: Structure and transport
... ternal field is to increase the ratio of the former events, reducing the latter, by aligning the polarization of the magnetic layer along the direction of the external field. This effect is a few tens of percent, and has the very important advantage of not being limited to low temperatures. Spin-val ...
... ternal field is to increase the ratio of the former events, reducing the latter, by aligning the polarization of the magnetic layer along the direction of the external field. This effect is a few tens of percent, and has the very important advantage of not being limited to low temperatures. Spin-val ...
Ph.D. THESIS Multipolar ordering in f
... unusual magnetic and electronic properties. The complexity of the observed behavior is ascribed to the 4f and 5f electrons which show various degrees of localization, ranging from completely localized to itinerant band-like behavior. These two series of elements in the periodic table possess incompl ...
... unusual magnetic and electronic properties. The complexity of the observed behavior is ascribed to the 4f and 5f electrons which show various degrees of localization, ranging from completely localized to itinerant band-like behavior. These two series of elements in the periodic table possess incompl ...
Electron properties of the substituted cerium compounds
... low-temperature region. The only one 4f electron shielded by 5d and 6s electron orbitals together with the influence of crystal electric field (CEF) stay behind the physical properties as magnetic ordering at very low temperatures, valence fluctuations, heavy-fermion behavior or unconventional super ...
... low-temperature region. The only one 4f electron shielded by 5d and 6s electron orbitals together with the influence of crystal electric field (CEF) stay behind the physical properties as magnetic ordering at very low temperatures, valence fluctuations, heavy-fermion behavior or unconventional super ...
Density Functional Theory and Group Theoretical Analysis in the
... A material showing a spontaneous electric polarization that can be reversed by the application of an external electric field is said to be ferroelectric. Ferroelectricity has long been an important topic in condensed-matter with important applications in memory devices [1]. The connection between fe ...
... A material showing a spontaneous electric polarization that can be reversed by the application of an external electric field is said to be ferroelectric. Ferroelectricity has long been an important topic in condensed-matter with important applications in memory devices [1]. The connection between fe ...
I Ceramic Material Classes - Wiley-VCH
... Thus, a range of methods has been developed for the preparation of nanopowders with desired properties. These can be roughly allocated to: (i) high-temperature/ flame synthesis; (ii) chemical synthesis, including sol–gel; and (iii) mechanically assisted processes, such as high-energy milling. 1.2.2.1 ...
... Thus, a range of methods has been developed for the preparation of nanopowders with desired properties. These can be roughly allocated to: (i) high-temperature/ flame synthesis; (ii) chemical synthesis, including sol–gel; and (iii) mechanically assisted processes, such as high-energy milling. 1.2.2.1 ...
c 2013 by Nicholas Torleiv Bronn. All rights
... dimensionality. Confining electrons to move in a line or plane, in that the quantum energy level spacing along the confined dimensions is much greater than the energy of the electrons, leads to observable quantum effects. For example, electrons confined to move in a two-dimensional plane formed by a ...
... dimensionality. Confining electrons to move in a line or plane, in that the quantum energy level spacing along the confined dimensions is much greater than the energy of the electrons, leads to observable quantum effects. For example, electrons confined to move in a two-dimensional plane formed by a ...
FIRST-PRINCIPLES STUDY ON HARD/SOFT SmCo5
... The data are compiled from References [7, 9, 10] .......................................... 21 4.1 Formation energies for FeCo alloys as defined in Eq. (4.1). The systems were initially set in bcc, fcc or hcp structures and then fully relaxed, including the cell shape and volume. A negative value im ...
... The data are compiled from References [7, 9, 10] .......................................... 21 4.1 Formation energies for FeCo alloys as defined in Eq. (4.1). The systems were initially set in bcc, fcc or hcp structures and then fully relaxed, including the cell shape and volume. A negative value im ...
Magnetic Properties of the One-Band Hubbard Model
... Clearly, in order to obtain reliable results for lattice models from the DMFT, an accurate method is needed to solve the impurity problem. In particular, this method should be non-perturbative, so that all the different parameter regimes are accessible, and furthermore, it should work in the thermod ...
... Clearly, in order to obtain reliable results for lattice models from the DMFT, an accurate method is needed to solve the impurity problem. In particular, this method should be non-perturbative, so that all the different parameter regimes are accessible, and furthermore, it should work in the thermod ...
Lead Oxides for Photovoltaics - Solar Energy Materials
... Thin films of PbO produced via air annealing of thermally evaporated lead consist of a mixture of two phases, orthorhombic and tetragonal, that determine the materials properties and effectiveness as absorber layer in a Schottky device. Films of higher tetragonal content are more photoactive, showin ...
... Thin films of PbO produced via air annealing of thermally evaporated lead consist of a mixture of two phases, orthorhombic and tetragonal, that determine the materials properties and effectiveness as absorber layer in a Schottky device. Films of higher tetragonal content are more photoactive, showin ...
Absence of photoemission from the Fermi level in potassium
... picene or coronene are doped with potassium (or sodium). It is well known from other molecular materials that particular doped phases might form while others are unstable. The most famous examples are potassium doped C60 compounds where for instance, stable K3 C60 , K4 C60 and K6 C60 phases have bee ...
... picene or coronene are doped with potassium (or sodium). It is well known from other molecular materials that particular doped phases might form while others are unstable. The most famous examples are potassium doped C60 compounds where for instance, stable K3 C60 , K4 C60 and K6 C60 phases have bee ...
Optical Characteristics of ZnTeO Thin Films Synthesized by Pulsed
... ZnTeO thin-film deposition under a relatively high oxygen partial pressure. Samples were deposited on both c-plane sapphire and GaAs (001) substrates using a ZnTe target, KrF excimer laser (k = 248 nm, 20 ns pulse width, 6 Hz repetition rate), a deposition temperature of 300°C, and varying ambients ...
... ZnTeO thin-film deposition under a relatively high oxygen partial pressure. Samples were deposited on both c-plane sapphire and GaAs (001) substrates using a ZnTe target, KrF excimer laser (k = 248 nm, 20 ns pulse width, 6 Hz repetition rate), a deposition temperature of 300°C, and varying ambients ...
Terminating species and Lewis acid-base low-dimensional compounds
... considerations from structural databases for further characterisation of such properties. Many compounds having a low-dimensional structure are known, but no successful synthesis strategies have previously been developed with a high probability for finding new such compounds. There are however sever ...
... considerations from structural databases for further characterisation of such properties. Many compounds having a low-dimensional structure are known, but no successful synthesis strategies have previously been developed with a high probability for finding new such compounds. There are however sever ...
Magnetic solids
... example, a ferromagnetic ordering of magnetic dipoles arranged on a square lattice (Figure 12.5a) can be transformed by canting of alternate layers (Figure 12.5b) into an antiferromagnetic configuration (Figure 12.5c). An important group of solids has two different magnetic dipoles present, one of g ...
... example, a ferromagnetic ordering of magnetic dipoles arranged on a square lattice (Figure 12.5a) can be transformed by canting of alternate layers (Figure 12.5b) into an antiferromagnetic configuration (Figure 12.5c). An important group of solids has two different magnetic dipoles present, one of g ...
Controlling Vortex Pinning and Dynamics of Solution Deposition
... Superconductivity was discovered in 1911 by H. Kamerling Onnes in Leiden (Holland) 3 years after he liquefied helium for first time at the temperature of 4.2K, giving him the refrigeration technique required to reach temperatures of a few degrees Kelvin. He measured the mercury resistivity at low te ...
... Superconductivity was discovered in 1911 by H. Kamerling Onnes in Leiden (Holland) 3 years after he liquefied helium for first time at the temperature of 4.2K, giving him the refrigeration technique required to reach temperatures of a few degrees Kelvin. He measured the mercury resistivity at low te ...
Electronic, thermoelectric and optical properties of vanadium oxides
... parameters have correctly depicted the highly anisotropic electrical conduction in V2O5. Maxima and crossovers are also seen in the temperature dependent variation of Seebeck coefficient in V2O5, which can be consequences of “specific details” of the band structure and anisotropic electron-phonon in ...
... parameters have correctly depicted the highly anisotropic electrical conduction in V2O5. Maxima and crossovers are also seen in the temperature dependent variation of Seebeck coefficient in V2O5, which can be consequences of “specific details” of the band structure and anisotropic electron-phonon in ...
06 _chapter 2
... the term is almost synonymous with the word “ferrite”. The spinel structure is derived from the mineral spinel (MgAl2O4 or MgO.Al2O3), that crystallizes in the cubic system. This crystal structure was first determined by Bragg [6] and by Nishikawa [7]. Analogous to the mineral spinel, the magnetic s ...
... the term is almost synonymous with the word “ferrite”. The spinel structure is derived from the mineral spinel (MgAl2O4 or MgO.Al2O3), that crystallizes in the cubic system. This crystal structure was first determined by Bragg [6] and by Nishikawa [7]. Analogous to the mineral spinel, the magnetic s ...
Light-absorption effect on Bragg interference in multilayer semiconductor heterostructures
... b561 nm grown on GaAs substrate and covered by 88-nmthick GaAs cap layer. All GaAs layers were doped with the donor ~Si! concentration n51018. There are no fitting parameters in the calculation, while the spectral dependence of k A is taken from Ref. 9. Note that this is a case of the intersubband a ...
... b561 nm grown on GaAs substrate and covered by 88-nmthick GaAs cap layer. All GaAs layers were doped with the donor ~Si! concentration n51018. There are no fitting parameters in the calculation, while the spectral dependence of k A is taken from Ref. 9. Note that this is a case of the intersubband a ...
Bogoliubov`s Vision: Quasiaverages and Broken Symmetry to
... It is possible to say therefore that the algebra U of observables is asymptotically abelian for space translation. A state which is invariant with respect to translations in space and time we can call respectively homogeneous and stationary. If a state is invariant for gauge transformation we say t ...
... It is possible to say therefore that the algebra U of observables is asymptotically abelian for space translation. A state which is invariant with respect to translations in space and time we can call respectively homogeneous and stationary. If a state is invariant for gauge transformation we say t ...
High-temperature superconductivity
High-temperature superconductors (abbreviated high-Tc or HTS) are materials that behave as superconductors at unusually high temperatures. The first high-Tc superconductor was discovered in 1986 by IBM researchers Georg Bednorz and K. Alex Müller, who were awarded the 1987 Nobel Prize in Physics ""for their important break-through in the discovery of superconductivity in ceramic materials"".Whereas ""ordinary"" or metallic superconductors usually have transition temperatures (temperatures below which they superconduct) below 30 K (−243.2 °C), and must be cooled using liquid helium in order to achieve superconductivity, HTS have been observed with transition temperatures as high as 138 K (−135 °C), and can be cooled to superconductivity using liquid nitrogen. Until 2008, only certain compounds of copper and oxygen (so-called ""cuprates"") were believed to have HTS properties, and the term high-temperature superconductor was used interchangeably with cuprate superconductor for compounds such as bismuth strontium calcium copper oxide (BSCCO) and yttrium barium copper oxide (YBCO). However, several iron-based compounds (the iron pnictides) are now known to be superconducting at high temperatures.For an explanation about Tc (the critical temperature for superconductivity), see Superconductivity § Superconducting phase transition and the second bullet item of BCS theory § Successes of the BCS theory.