ultrasound action on strength properties of polycrystalline metals
... barriers to dislocation motion, but we also viewed a grain boundary as a sort of "film". If the properties of the grain boundary were known then a more complete analysis of their strengthening effect could be made. Grain boundaries are simply planar defects between adjacent grains, each grain having ...
... barriers to dislocation motion, but we also viewed a grain boundary as a sort of "film". If the properties of the grain boundary were known then a more complete analysis of their strengthening effect could be made. Grain boundaries are simply planar defects between adjacent grains, each grain having ...
Mineral power point talk
... the surface, it cools. The atoms and molecules in the liquid magmas begin to interact chemically and form minerals. If the magma cools quickly the crystals will be small crystals. If the magma cools slowly the crystals will be large. The second way minerals form is from solutions. A solution can be ...
... the surface, it cools. The atoms and molecules in the liquid magmas begin to interact chemically and form minerals. If the magma cools quickly the crystals will be small crystals. If the magma cools slowly the crystals will be large. The second way minerals form is from solutions. A solution can be ...
Dirac Fermions and Superconductivity in Homologous Structures
... The observation of quantum phenomena in topological insulators (TIs) is closely related to the discovery of new materials [1-4]. Numerous advances on TIs [5-9], both theoretical and experimental, were based on two binary bismuth compounds, Bi2Se3 and Bi2Te3. Material tailoring of Bi2Se3 with other ...
... The observation of quantum phenomena in topological insulators (TIs) is closely related to the discovery of new materials [1-4]. Numerous advances on TIs [5-9], both theoretical and experimental, were based on two binary bismuth compounds, Bi2Se3 and Bi2Te3. Material tailoring of Bi2Se3 with other ...
3 Minerals
... rigid framework.The arrangement in crystalline solids is quite different.The atomic structure of a crystal consists of a regular, repeating, three-dimensional pattern known as a crystal structure. However, there are some amorphous solids in which the atomic arrangement is random. Glass is an example ...
... rigid framework.The arrangement in crystalline solids is quite different.The atomic structure of a crystal consists of a regular, repeating, three-dimensional pattern known as a crystal structure. However, there are some amorphous solids in which the atomic arrangement is random. Glass is an example ...
complexes with bidentate N,N?-bis(b-phenylcinnamaldehyde)
... degeneracy due to the difference in the ligand field strength of imine and halides donor atoms and the restricted bite angle of the N(1) /M /N(2) chelating ligand [25,26]. The intensity of the UV-band is consistent with its being a ligand-centered p 0/p transition or/ and a charge-transfer transi ...
... degeneracy due to the difference in the ligand field strength of imine and halides donor atoms and the restricted bite angle of the N(1) /M /N(2) chelating ligand [25,26]. The intensity of the UV-band is consistent with its being a ligand-centered p 0/p transition or/ and a charge-transfer transi ...
Evidence for a large enrichment of interstitial oxygen atoms in the
... It is well known that impurities located in crystalline materials induce changes in many of their properties. For example, mechanical properties of several bcc metals suffer drastic modifications in the presence of hydrogen atoms in interstitial sites since they become brittle.1 The temperature of t ...
... It is well known that impurities located in crystalline materials induce changes in many of their properties. For example, mechanical properties of several bcc metals suffer drastic modifications in the presence of hydrogen atoms in interstitial sites since they become brittle.1 The temperature of t ...
Tin - Cometal S.A.
... Tin melts at a low temperature, it has high fluidity when melted and also has a high boiling point; it also presents a significant corrosion resistance to many media. Tin reacts with both strong acids and alkalis, but it is relatively resistant to near-neutral solutions. Normally, when it is exposed ...
... Tin melts at a low temperature, it has high fluidity when melted and also has a high boiling point; it also presents a significant corrosion resistance to many media. Tin reacts with both strong acids and alkalis, but it is relatively resistant to near-neutral solutions. Normally, when it is exposed ...
OUTSTANDING MEETING PAPER Phase field theory of crystal
... as grain refiners to reduce grain size by enhancing the nucleation rate. Heterogeneous nucleation is probably the least understood stage of solidification since the molecular scales of this self-organization normally precludes direct observation of the process. Although the phase field method has be ...
... as grain refiners to reduce grain size by enhancing the nucleation rate. Heterogeneous nucleation is probably the least understood stage of solidification since the molecular scales of this self-organization normally precludes direct observation of the process. Although the phase field method has be ...
Dielectric Properties of Materials
... An electric field of 6 × 104 volt/meter is applied on a sample of Neon gas at N.T.P. Calculate the dipole moment induced if the dielectric constant of Neon at N.T.P. is 1.000134. Also find out the atomic polarizability of Neon. The permittivity of diamond is 1.46 × 10-10 N-1m-2. Determine its dielec ...
... An electric field of 6 × 104 volt/meter is applied on a sample of Neon gas at N.T.P. Calculate the dipole moment induced if the dielectric constant of Neon at N.T.P. is 1.000134. Also find out the atomic polarizability of Neon. The permittivity of diamond is 1.46 × 10-10 N-1m-2. Determine its dielec ...
Studies of Oxygen Deficient Complex Cobaltates with Perovskite Related Structures.
... two expressions given in the picture. In the ideal case the ratio between the two expressions given should equal 1. 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), superstructure ...
... two expressions given in the picture. In the ideal case the ratio between the two expressions given should equal 1. 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), superstructure ...
Accepted version - Queen Mary University of London
... rhombohedral phase.34 The anomaly at Tm instead was deconvoluted in two different processes taking place with increasing temperature, which include two events: a) the disappearance of the rhombohedral phase (frequency independent anomaly in permittivity);34 and b) the relaxation process of the pola ...
... rhombohedral phase.34 The anomaly at Tm instead was deconvoluted in two different processes taking place with increasing temperature, which include two events: a) the disappearance of the rhombohedral phase (frequency independent anomaly in permittivity);34 and b) the relaxation process of the pola ...
Microstructure-Properties: I Lecture 3: Mathematical Descriptions of
... The frames that are typically of interest are the sample frame and the crystal frame. The latter has to be a Cartesian frame, so sometimes additional conversions from the crystal (Bravais) frame to the Cartesian crystal frame are required. Continuing with the worked example, write out explicitly the ...
... The frames that are typically of interest are the sample frame and the crystal frame. The latter has to be a Cartesian frame, so sometimes additional conversions from the crystal (Bravais) frame to the Cartesian crystal frame are required. Continuing with the worked example, write out explicitly the ...
Spontaneous emission spectra of organic molecules in synthetic
... molecules embedded in different photonic crystals [4–8]. As a prototype of threedimensional photonic crystals, synthetic opal photonic crystals (SOPC) have been used. They represent artificial three-dimensionally periodic, globular dielectric structures with the period close to the light wavelength. ...
... molecules embedded in different photonic crystals [4–8]. As a prototype of threedimensional photonic crystals, synthetic opal photonic crystals (SOPC) have been used. They represent artificial three-dimensionally periodic, globular dielectric structures with the period close to the light wavelength. ...
Full-Text PDF
... M1 -MFI/M2 -MCM-41 (M1 , M2 = Ni, Co) and their catalytic properties for the hydrocracking of residual oil [11] and the preparation of micro–mesoporous FeCo-MFI/MCM-41 composites which gave a clear improvement in the hydrocracking of residual oil [12]. However, the resulting materials are composites ...
... M1 -MFI/M2 -MCM-41 (M1 , M2 = Ni, Co) and their catalytic properties for the hydrocracking of residual oil [11] and the preparation of micro–mesoporous FeCo-MFI/MCM-41 composites which gave a clear improvement in the hydrocracking of residual oil [12]. However, the resulting materials are composites ...
mineral identification
... Crystal form is the shape taken by a mineral when it is allowed to develop in favorable conditions. All minerals have a crystal form, but some will develop crystals in only very specific conditions. While the crystal form is very characteristic for any given mineral, it is one of the more difficu ...
... Crystal form is the shape taken by a mineral when it is allowed to develop in favorable conditions. All minerals have a crystal form, but some will develop crystals in only very specific conditions. While the crystal form is very characteristic for any given mineral, it is one of the more difficu ...
Spintronic materials based on main-group elements
... burns to its peroxide in air. The potassium superoxide is stable; it is even applied in closedcircuit breathing apparatus, where it reacts with exhaled carbon dioxide and water, releasing oxygen. Other alkali metals that are most likely to form sesquioxides are thus potassium and caesium (we will no ...
... burns to its peroxide in air. The potassium superoxide is stable; it is even applied in closedcircuit breathing apparatus, where it reacts with exhaled carbon dioxide and water, releasing oxygen. Other alkali metals that are most likely to form sesquioxides are thus potassium and caesium (we will no ...
Crystal structure
In mineralogy and crystallography, a crystal structure is a unique arrangement of atoms, ions or molecules in a crystalline liquid or solid. It describes a highly ordered structure, occurring due to the intrinsic nature of its constituents to form symmetric patterns.The crystal lattice can be thought of as an array of 'small boxes' infinitely repeating in all three spatial directions. Such a unit cell is the smallest unit of volume that contains all of the structural and symmetry information to build-up the macroscopic structure of the lattice by translation.Patterns are located upon the points of a lattice, which is an array of points repeating periodically in three dimensions. The lengths of the edges of a unit cell and the angles between them are called the lattice parameters. The symmetry properties of the crystal are embodied in its space group.A crystal's structure and symmetry play a role in determining many of its physical properties, such as cleavage, electronic band structure, and optical transparency.