The Luminescent Properties of Yttrium Oxyapatite Doped
... D0 -7F2 emission of Eu3+ ions belongs to the hypersensitive, forced electric dipole transition, which is highly sensitive on the symmetry of Eu3+ surrounding [1-2]. Generally, the 7FJ energy levels of free Eu3+ ions (4f6 electron configuration) in a crystal lattice split under the effect of crystal ...
... D0 -7F2 emission of Eu3+ ions belongs to the hypersensitive, forced electric dipole transition, which is highly sensitive on the symmetry of Eu3+ surrounding [1-2]. Generally, the 7FJ energy levels of free Eu3+ ions (4f6 electron configuration) in a crystal lattice split under the effect of crystal ...
Synthesis, characterization, and electronic properties of novel 2D
... George Anderson 15th April 2016 Scaling electronic devices has become paramount. The current work builds upon scaling efforts by developing novel synthesis methods and next generation sensing devices based on 2D materials. A new combination method utilizing thermal evaporation and chemical vapor dep ...
... George Anderson 15th April 2016 Scaling electronic devices has become paramount. The current work builds upon scaling efforts by developing novel synthesis methods and next generation sensing devices based on 2D materials. A new combination method utilizing thermal evaporation and chemical vapor dep ...
A cathodoluminescence study of CdTe thin
... cathodoluminescence (CL) spectrum imaging was used to examine these fundamental relationships. In CL spectrum imaging we collect a spectrum per pixel in a 256 × 256 pixel SEM image by synchronizing a cryogenic silicon charge-coupled device with the electron-beam positioning. High spatial resolution ...
... cathodoluminescence (CL) spectrum imaging was used to examine these fundamental relationships. In CL spectrum imaging we collect a spectrum per pixel in a 256 × 256 pixel SEM image by synchronizing a cryogenic silicon charge-coupled device with the electron-beam positioning. High spatial resolution ...
INSTRUCTIUNI DE REDACTARE
... eight solvents, five of them polar (distilled water, ethanol, 3% acetic acid, isopropylic alcohol, acetone) and three nonpolar (hexane, benzene, petroleum ether). Our purpose was to establish the optimal microwave extraction parameters and to compare the results with the classical method of extracti ...
... eight solvents, five of them polar (distilled water, ethanol, 3% acetic acid, isopropylic alcohol, acetone) and three nonpolar (hexane, benzene, petroleum ether). Our purpose was to establish the optimal microwave extraction parameters and to compare the results with the classical method of extracti ...
Picosecond laser ablation system with process control
... material and desirable effect of energy concentration in a very thin, sub-micron surface layer is achieved when this time is longer than the pulse duration. This is a case for varnishes which due to being organic materials usually have thermal relaxation times as long as several nanoseconds [14]. It ...
... material and desirable effect of energy concentration in a very thin, sub-micron surface layer is achieved when this time is longer than the pulse duration. This is a case for varnishes which due to being organic materials usually have thermal relaxation times as long as several nanoseconds [14]. It ...
Dissertation
... Cleaver, Dr. Lorin S. Matthews, Dr. Dwight P. Russell, Dr. Kenneth T. Park, Dr. Anzhong Wang and Dr. B.F.L. Ward for teaching and preparing me for the physics profession. I have enjoyed learning with them and thank them for setting great examples of instructors. I would like to thank Dr. Minghu Pan ...
... Cleaver, Dr. Lorin S. Matthews, Dr. Dwight P. Russell, Dr. Kenneth T. Park, Dr. Anzhong Wang and Dr. B.F.L. Ward for teaching and preparing me for the physics profession. I have enjoyed learning with them and thank them for setting great examples of instructors. I would like to thank Dr. Minghu Pan ...
The Potassium Promoter Function in the
... The interaction of potassium and oxygen, individually and as coadsorbates with graphite, was studied experimentallyand theoretically. In the experiments the sticking of oxygen was investigatedat different K coverages. The extremely low sticking coefficient for chemisorptionldissociation of dioxygen ...
... The interaction of potassium and oxygen, individually and as coadsorbates with graphite, was studied experimentallyand theoretically. In the experiments the sticking of oxygen was investigatedat different K coverages. The extremely low sticking coefficient for chemisorptionldissociation of dioxygen ...
La-Mn-Co perovskites for the catalytic flameless combustion
... of manganites, to oxygen overstoichiometry. Moreover, in a previous investigation on silver doping [20] it was found that in Sr1-xAgxTiO3 perovskites silver may exist either as intracrystalline framework Ag+ and Ag2+ ions or as inter-crystalline metallic silver. Ag2+ ions could interact with some ...
... of manganites, to oxygen overstoichiometry. Moreover, in a previous investigation on silver doping [20] it was found that in Sr1-xAgxTiO3 perovskites silver may exist either as intracrystalline framework Ag+ and Ag2+ ions or as inter-crystalline metallic silver. Ag2+ ions could interact with some ...
Cation order/disorder in lithium transition
... d∆Hpp/dT has a poor dependence on (1 – x), and another for 0.7 < (1 – x) < 1, where d∆Hpp/dT sharply decreases as (1 – x) increases. The observed dependence reveals the corresponding changes in the composition of the Ni3+–O–Ni3+/2+ shell as the Li amount increases from 0.6 to 1. For 0.6 ≤ (1 – x) ≤ ...
... d∆Hpp/dT has a poor dependence on (1 – x), and another for 0.7 < (1 – x) < 1, where d∆Hpp/dT sharply decreases as (1 – x) increases. The observed dependence reveals the corresponding changes in the composition of the Ni3+–O–Ni3+/2+ shell as the Li amount increases from 0.6 to 1. For 0.6 ≤ (1 – x) ≤ ...
university of oslo
... gallate, mixed conductors, and alkaline earth cerates which dissolve protons and become proton conductors at high temperatures. A revision of the book from 1972 as such is thus utopic in many respects. In the early 1990s Kofstad decided to author a new text that represented a development of the gene ...
... gallate, mixed conductors, and alkaline earth cerates which dissolve protons and become proton conductors at high temperatures. A revision of the book from 1972 as such is thus utopic in many respects. In the early 1990s Kofstad decided to author a new text that represented a development of the gene ...
First principles calculation of Solid-State NMR parameters - Psi-k
... Figure 1: (right) 13 C CP-MAS spectrum of a molecular crystal (Flurbiprofen(1)). The effect of magnetic shielding causes nuclei in different chemical environments to resonate at slightly different frequencies can be increased by using high magnetic fields and choosing nuclei with a large value of γ ...
... Figure 1: (right) 13 C CP-MAS spectrum of a molecular crystal (Flurbiprofen(1)). The effect of magnetic shielding causes nuclei in different chemical environments to resonate at slightly different frequencies can be increased by using high magnetic fields and choosing nuclei with a large value of γ ...
Complex defects
... Along with the discovery of many new uses of oxides, as well as improved computer resources for handling more complex tasks, the field has changed focus from binary oxides towards ternary or higher oxides. This is not least due to the growing awareness that perovskites and related structures tolerat ...
... Along with the discovery of many new uses of oxides, as well as improved computer resources for handling more complex tasks, the field has changed focus from binary oxides towards ternary or higher oxides. This is not least due to the growing awareness that perovskites and related structures tolerat ...
Applications of scanning optical microscopy in materials science to
... dust on a spacecraft (Anderson, 1994). Petford & Miller (1993) applied the confocal scanning microscope in the reflection mode to study microdefects and fission tracks in apatite. They obtained a three-dimensional distribution of these crystal defects in a manner similar to the SIRM studies. The abo ...
... dust on a spacecraft (Anderson, 1994). Petford & Miller (1993) applied the confocal scanning microscope in the reflection mode to study microdefects and fission tracks in apatite. They obtained a three-dimensional distribution of these crystal defects in a manner similar to the SIRM studies. The abo ...
Theoretical Limits of Hydrogen Storage in MetalâOrganic Frameworks
... materials for gas capture and storage. While much effort has been devoted to the discovery of new MOFs, a vast catalog of existing MOFs resides within the Cambridge Structural Database (CSD), many of whose gas uptake properties have not been assessed. Here we employ data mining and automated structur ...
... materials for gas capture and storage. While much effort has been devoted to the discovery of new MOFs, a vast catalog of existing MOFs resides within the Cambridge Structural Database (CSD), many of whose gas uptake properties have not been assessed. Here we employ data mining and automated structur ...
Data mining and accelerated electronic structure theory as a tool in
... for known cerium materials, that show 5d to 4f luminescence, as well as known semiconductor materials which have been found to have encouraging materials properties. The data mining results in 136 candidate materials proposed for further investigation. A first desirable property for the materials of ...
... for known cerium materials, that show 5d to 4f luminescence, as well as known semiconductor materials which have been found to have encouraging materials properties. The data mining results in 136 candidate materials proposed for further investigation. A first desirable property for the materials of ...
The origin of the support effect in supported metal oxide catalysts: in
... scans and, after acquisition, were smoothed using the Savitsky±Golay method (20-point, second-degree polynomial). The IR was operated in transmission mode using a specially designed in situ cell, which is described below. Transmission mode was selected for this work to take advantage of the linear a ...
... scans and, after acquisition, were smoothed using the Savitsky±Golay method (20-point, second-degree polynomial). The IR was operated in transmission mode using a specially designed in situ cell, which is described below. Transmission mode was selected for this work to take advantage of the linear a ...
Morphology Study by Using Scanning Electron Microscopy
... (cathodoluminescence), specimen current and transmitted electrons [5]. By detection of secondary electron, SEM can produce vivid images of a sample surface (secondary electron image, or SEI), with superior resolution about 1 to 5 nm. Due to the relative narrower electron beam, SEM has a much greater ...
... (cathodoluminescence), specimen current and transmitted electrons [5]. By detection of secondary electron, SEM can produce vivid images of a sample surface (secondary electron image, or SEI), with superior resolution about 1 to 5 nm. Due to the relative narrower electron beam, SEM has a much greater ...
Dyadic Green`s functions and guided surface waves for a surface
... Fundamental properties and potential applications of carbon-based structures are of interest in emerging nanoelectronic applications. Particularly promising is graphene, which is a planar atomic layer of carbon atoms bonded in a hexagonal structure. Graphene is the two-dimensional version of graphit ...
... Fundamental properties and potential applications of carbon-based structures are of interest in emerging nanoelectronic applications. Particularly promising is graphene, which is a planar atomic layer of carbon atoms bonded in a hexagonal structure. Graphene is the two-dimensional version of graphit ...
Studies of Oxygen Deficient Complex Cobaltates with Perovskite Related Structures.
... However, if t slightly deviates from 1, this might serve as an indication for the formation of a perovskite structure of non-ideal type. For t values below 1 (t ≈ 0.85), superstructures of the cubic variant often form, while values above unity indicate formation of a hexagonal variant including unit ...
... However, if t slightly deviates from 1, this might serve as an indication for the formation of a perovskite structure of non-ideal type. For t values below 1 (t ≈ 0.85), superstructures of the cubic variant often form, while values above unity indicate formation of a hexagonal variant including unit ...
Metrology of integrated waveguide devices and systems
... an environment for further NSOM studies [3]. The chip contains a series of waveguide straight sections, splitters, and bends in the form of an H-tree as illustrated in Fig. 5(b) to deliver an optical clock signal to 16 nodes where a leaky-mode detector converts the optical signal to photocurrent. Fi ...
... an environment for further NSOM studies [3]. The chip contains a series of waveguide straight sections, splitters, and bends in the form of an H-tree as illustrated in Fig. 5(b) to deliver an optical clock signal to 16 nodes where a leaky-mode detector converts the optical signal to photocurrent. Fi ...
Crystal Structures
... How do we identify various crystals, and tell two materials apart from their crystal properties? We need a method by which we can describe the crystal in terms of its basic properties. This can be done in one sense, because there are only a few types of crystal lattice. Hence, identifying this struc ...
... How do we identify various crystals, and tell two materials apart from their crystal properties? We need a method by which we can describe the crystal in terms of its basic properties. This can be done in one sense, because there are only a few types of crystal lattice. Hence, identifying this struc ...
Synthetic Strategies, Structure Patterns, and Emerging
... designed synthesis of porous materials to become a reality with routine utility. First, it is difficult to control the orientation and stereochemistry of the building blocks in the solid state in order to achieve a given target molecular topology and architecture. Second, in most cases, the products ...
... designed synthesis of porous materials to become a reality with routine utility. First, it is difficult to control the orientation and stereochemistry of the building blocks in the solid state in order to achieve a given target molecular topology and architecture. Second, in most cases, the products ...
chapter1 - Shodhganga
... significant contributions of Snoek’s group work (Philips) since 1930s. Kittel formulated theory of domain formation, coercive force and domain wall dynamics [22-c]. The work of Verwey and Heilmann [25] on the distribution of ions over the tetrahedral and octahedral sites in the spinel lattice has co ...
... significant contributions of Snoek’s group work (Philips) since 1930s. Kittel formulated theory of domain formation, coercive force and domain wall dynamics [22-c]. The work of Verwey and Heilmann [25] on the distribution of ions over the tetrahedral and octahedral sites in the spinel lattice has co ...
Measuring and Reporting Electrical Conductivity in Metal
... devices, are especially acute for porous materials, whose high surface area make them even more susceptible to interactions with contaminants in the environment. Here, we use the anisotropic semiconducting framework Cd2(TTFTB) (TTFTB4− = tetrathiafulvalene tetrabenzoate) to benchmark several common ...
... devices, are especially acute for porous materials, whose high surface area make them even more susceptible to interactions with contaminants in the environment. Here, we use the anisotropic semiconducting framework Cd2(TTFTB) (TTFTB4− = tetrathiafulvalene tetrabenzoate) to benchmark several common ...
Atom probe
The atom probe was introduced at the 14th International Field Emission Symposium in 1967 by Erwin W. Müller and John Panitz. For the first time an instrument could “... determine the nature of one single atom seen on a metal surface and selected from neighboring atoms at the discretion of the observer”. Erwin Wilhelm Müller, J. A. Panitz, and S. Brooks McLane. The atom probe is closely related to the field ion microscope, the first microscopic instrument capable of atomic resolution, developed in 1951 by Erwin Wilhelm Müller.Atom probes are unlike conventional optical or electron microscopes, in that the magnification effect comes from the magnification provided by a highly curved electric field, rather than by the manipulation of radiation paths. The method is destructive in nature removing ions from a sample surface in order to image and identify them, generating magnifications sufficient to observe individual atoms as they are removed from the sample surface. Through coupling of this magnification method with time of flight mass spectrometry, ions evaporated by application of electric pulses can have their mass-to-charge ratio computed.Through successive evaporation of material, layers of atoms are removed from a specimen, allowing for probing not only of the surface, but also through the material itself. Computer methods are utilised to rebuild a three-dimensional view of the sample, prior to it being evaporated, providing atomic scale information on the structure of a sample, as well as providing the type atomic species information. The instrument allows the three-dimensional reconstruction of up to billions of atoms from a sharp tip (corresponding to specimen volumes of 10,000-10,000,000 nm3).