Chapter 3. The structure of crystalline solids
... A crystalline material is a material that the atoms are situated in a periodic array over large atomic distances. A noncrystalline or amorphous material is a material that does not have a long-range atomic order. Crystal structure is a manner in which atoms, ions, or molecules are spatially arranged ...
... A crystalline material is a material that the atoms are situated in a periodic array over large atomic distances. A noncrystalline or amorphous material is a material that does not have a long-range atomic order. Crystal structure is a manner in which atoms, ions, or molecules are spatially arranged ...
Physical properties of Semiconductors
... CONDUCTIVITY AND ITS DEPENDENCE ON TEMPERATURE. ELECTRIC CONDUCTIVITY OF NONDEGENERATE SEMICONDUCTORS WITH SIMPLE BAND STRUCTURE. MECHANISMS OF SCATTERING OF CHARGE CARRIERS AND THEIR INFLUENCE ON THE RELAXATION TIME. THE HALL EFFECT IN SEMICONDUCTORS. HALL CONSTANT, MAGNETORESISTANCE. THERMOELECTRI ...
... CONDUCTIVITY AND ITS DEPENDENCE ON TEMPERATURE. ELECTRIC CONDUCTIVITY OF NONDEGENERATE SEMICONDUCTORS WITH SIMPLE BAND STRUCTURE. MECHANISMS OF SCATTERING OF CHARGE CARRIERS AND THEIR INFLUENCE ON THE RELAXATION TIME. THE HALL EFFECT IN SEMICONDUCTORS. HALL CONSTANT, MAGNETORESISTANCE. THERMOELECTRI ...
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... • Homogenous Mixture-a mixture with a composition that is uniform throughout, all the way down to the molecular level. • Hydrocarbon-any molecule consisting of only hydrogen and carbon atoms, typically fossil fuels and other compounds derived from them. • Ion- a charged atom, it has either gained or ...
... • Homogenous Mixture-a mixture with a composition that is uniform throughout, all the way down to the molecular level. • Hydrocarbon-any molecule consisting of only hydrogen and carbon atoms, typically fossil fuels and other compounds derived from them. • Ion- a charged atom, it has either gained or ...
Characterization of the phase transition in coper-gold alloys by X
... As a crystal transforms in an ordered phase, the crystal forms new lattice planes, called overstructure ...
... As a crystal transforms in an ordered phase, the crystal forms new lattice planes, called overstructure ...
Lecture 1: Crystal structure
... • Crystal is formed from a lattice (Bravais lattice) and from a basis consisting of one or more atoms. • The basis is repeated with the symmetry of the Bravais lattice. • When travelling from a one lattice point to another, the surrounding atomic structure is the same (translational symmetry). • In ...
... • Crystal is formed from a lattice (Bravais lattice) and from a basis consisting of one or more atoms. • The basis is repeated with the symmetry of the Bravais lattice. • When travelling from a one lattice point to another, the surrounding atomic structure is the same (translational symmetry). • In ...
Atomic arrangment
... one must recognize that lattice points may be shared by more than one unit cell ...
... one must recognize that lattice points may be shared by more than one unit cell ...
Materials on an Atomic Level
... A dislocation is a linear or one-dimensional defect around which some of the atoms are misaligned. One type of dislocation is when the edge of an extra plane of atoms terminates within the crystal. This is termed an edge dislocation. The line at which the edge terminates is termed the dislocation li ...
... A dislocation is a linear or one-dimensional defect around which some of the atoms are misaligned. One type of dislocation is when the edge of an extra plane of atoms terminates within the crystal. This is termed an edge dislocation. The line at which the edge terminates is termed the dislocation li ...
Symmetry - West Virginia University
... If an object looks the same after rotation of 360o/n, that object is said to have nfold rotational symmetry or an n-fold axis Called n-fold, because it takes n rotations to return to its original position Only certain angles ("-folds") of rotational symmetry are possible in minerals ...
... If an object looks the same after rotation of 360o/n, that object is said to have nfold rotational symmetry or an n-fold axis Called n-fold, because it takes n rotations to return to its original position Only certain angles ("-folds") of rotational symmetry are possible in minerals ...
Chemistry and Material Science 1. Physical Properties of Materials
... Figure above illustrates the two common types of point defects associated with elemental solids: (1) the vacancy is simply an unoccupied atom site in the crystal structure, and (2) the interstitial, or interstitiancy, is an atom occupying an interstitial site not normally occupied by an atom in th ...
... Figure above illustrates the two common types of point defects associated with elemental solids: (1) the vacancy is simply an unoccupied atom site in the crystal structure, and (2) the interstitial, or interstitiancy, is an atom occupying an interstitial site not normally occupied by an atom in th ...
Crystal structure
... at one of the unit cell corners; each of the x, y, and z axes coincides with one of the three parallelepiped edges that extend from this corner, as illustrated in Figure 1.2. The unit cell geometry is completely defined in terms of six parameters: the three edge lengths a, b, and c, and the three in ...
... at one of the unit cell corners; each of the x, y, and z axes coincides with one of the three parallelepiped edges that extend from this corner, as illustrated in Figure 1.2. The unit cell geometry is completely defined in terms of six parameters: the three edge lengths a, b, and c, and the three in ...
Chapter 3: The Structure of Crystalline Solids
... • Atoms may assemble into crystalline or amorphous structures. • Common metallic crystal structures are FCC, BCC, and HCP. Coordination number and atomic packing factor are the same for both FCC and HCP crystal structures. • We can predict the density of a material, provided we know the atomic weigh ...
... • Atoms may assemble into crystalline or amorphous structures. • Common metallic crystal structures are FCC, BCC, and HCP. Coordination number and atomic packing factor are the same for both FCC and HCP crystal structures. • We can predict the density of a material, provided we know the atomic weigh ...
the music of molecules: novel approaches for stem education
... translational components. Therefore, the study of the morphology of the crystal allows the derivation only of the set of symmetry elements without translations, called “symmetry class” or “point group” of the crystal. This symmetry, however, will not be the same of the crystal, if screw axes or glid ...
... translational components. Therefore, the study of the morphology of the crystal allows the derivation only of the set of symmetry elements without translations, called “symmetry class” or “point group” of the crystal. This symmetry, however, will not be the same of the crystal, if screw axes or glid ...
Chapter 1-Crystal Properties_M A Islam_Lecture 1
... • The number of dopant atoms needed to create a difference in the ability of a semiconductor to conduct is very small. Where a comparatively small number of dopant atoms are added (of the order of 1 every 100,000,000 atoms) then the doping is said to be low, or light. • Where many more are added (of ...
... • The number of dopant atoms needed to create a difference in the ability of a semiconductor to conduct is very small. Where a comparatively small number of dopant atoms are added (of the order of 1 every 100,000,000 atoms) then the doping is said to be low, or light. • Where many more are added (of ...
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.