Crystalline Structures - Revision history

MaxwellH: /* Body-Centered Cubic */

2024-12-07T03:34:52Z

Body-Centered Cubic

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	In addition to the corner atoms, there is a single atom located at the center of the unit cell. This arrangement increases the packing efficiency compared to the primitive structure but still leaves some empty space within the lattice.		In addition to the corner atoms, there is a single atom located at the center of the unit cell. This arrangement increases the packing efficiency compared to the primitive structure but still leaves some empty space within the lattice.

	Example: Iron, Tungsten, Potassium ~~(K)~~		Example: Iron, Tungsten, Potassium

	====Face-Centered Cubic====		====Face-Centered Cubic====

MaxwellH: /* Sources */

2024-12-07T03:22:36Z

Sources

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	https://wisc.pb.unizin.org/minimisgenchem/chapter/types-of-unit-cells-body-centered-cubic-and-face-centered-cubic-m11q5/ https://creativecommons.org/licenses/by-nc-sa/4.0/		https://wisc.pb.unizin.org/minimisgenchem/chapter/types-of-unit-cells-body-centered-cubic-and-face-centered-cubic-m11q5/ https://creativecommons.org/licenses/by-nc-sa/4.0/

	https://wisc.pb.unizin.org/chem103and104/chapter/types-of-unit-cells-primitive-cubic-cell-m11q4/		https://wisc.pb.unizin.org/chem103and104/chapter/types-of-unit-cells-primitive-cubic-cell-m11q4/ https://creativecommons.org/licenses/by-nc-sa/4.0/

	https://www.uobabylon.edu.iq/eprints/publication_10_6164_84.pdf		https://www.uobabylon.edu.iq/eprints/publication_10_6164_84.pdf

MaxwellH: /* Sources */

2024-12-07T03:22:04Z

Sources

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	==Sources==		==Sources==
	https://wisc.pb.unizin.org/minimisgenchem/chapter/types-of-unit-cells-body-centered-cubic-and-face-centered-cubic-m11q5/		https://wisc.pb.unizin.org/minimisgenchem/chapter/types-of-unit-cells-body-centered-cubic-and-face-centered-cubic-m11q5/ https://creativecommons.org/licenses/by-nc-sa/4.0/

	https://wisc.pb.unizin.org/chem103and104/chapter/types-of-unit-cells-primitive-cubic-cell-m11q4/		https://wisc.pb.unizin.org/chem103and104/chapter/types-of-unit-cells-primitive-cubic-cell-m11q4/

	https://www.uobabylon.edu.iq/eprints/publication_10_6164_84.pdf		https://www.uobabylon.edu.iq/eprints/publication_10_6164_84.pdf

MaxwellH: /* Sources */

2024-12-07T02:54:56Z

Sources

← Older revision		Revision as of 22:54, 6 December 2024
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	https://wisc.pb.unizin.org/chem103and104/chapter/types-of-unit-cells-primitive-cubic-cell-m11q4/		https://wisc.pb.unizin.org/chem103and104/chapter/types-of-unit-cells-primitive-cubic-cell-m11q4/

			https://www.uobabylon.edu.iq/eprints/publication_10_6164_84.pdf

MaxwellH: /* Types of Impurities */

2024-12-07T02:53:48Z

Types of Impurities

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	====Point Defects/Vacancy:====		====Point Defects/Vacancy:====
	Includes vacancies, where an atom is missing from the lattice, or foreign atoms that disrupt the crystal's regularity.		Includes vacancies, where an atom is missing from the lattice, or foreign atoms that disrupt the crystal's regularity.

			[[File:DefectsCrystals.png]]

	===Effects of Impurities===		===Effects of Impurities===

MaxwellH: /* Point Defects: */

2024-12-07T02:52:19Z

Point Defects:

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	Example: Carbon atoms in the interstitial sites of iron, forming steel.		Example: Carbon atoms in the interstitial sites of iron, forming steel.

	====Point Defects:====		====Point Defects/Vacancy:====
	Includes vacancies, where an atom is missing from the lattice, or foreign atoms that disrupt the crystal's regularity.		Includes vacancies, where an atom is missing from the lattice, or foreign atoms that disrupt the crystal's regularity.

MaxwellH: /* Types of Impurities */

2024-12-07T02:50:53Z

Types of Impurities

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	Includes vacancies, where an atom is missing from the lattice, or foreign atoms that disrupt the crystal's regularity.		Includes vacancies, where an atom is missing from the lattice, or foreign atoms that disrupt the crystal's regularity.

	====Effects of Impurities====		===Effects of Impurities===
	Mechanical Properties: Impurities can strengthen a material by hindering dislocation movement (e.g., in alloys like steel).		Mechanical Properties: Impurities can strengthen a material by hindering dislocation movement (e.g., in alloys like steel).

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	Optical Properties: Impurities can absorb or scatter light, influencing transparency or color.		Optical Properties: Impurities can absorb or scatter light, influencing transparency or color.

	====Applications====		===Applications===
	Doping in Semiconductors: Controlled addition of impurities like phosphorus or boron to silicon enables the creation of Diodes or Transistors.		Doping in Semiconductors: Controlled addition of impurities like phosphorus or boron to silicon enables the creation of Diodes or Transistors.

MaxwellH: /* Impurities */

2024-12-07T02:50:34Z

Impurities

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	==Impurities==		==Impurities==
			Impurities are atoms or molecules that are not part of the ideal crystal lattice but are present in the material. These can be either intentionally introduced or occur naturally during the crystal's formation. Impurities play a crucial role in determining the material's properties and are often exploited in applications like semiconductors and metallurgy.

			===Types of Impurities===
			====Substitutional Impurities:====
			Foreign atoms replace the host atoms in the crystal lattice.

			Example: In brass, zinc atoms substitute copper atoms.

			====Interstitial Impurities:====
			Smaller foreign atoms occupy the spaces (interstitial sites) between the host atoms in the lattice.

			Example: Carbon atoms in the interstitial sites of iron, forming steel.

			====Point Defects:====
			Includes vacancies, where an atom is missing from the lattice, or foreign atoms that disrupt the crystal's regularity.

			====Effects of Impurities====
			Mechanical Properties: Impurities can strengthen a material by hindering dislocation movement (e.g., in alloys like steel).

			Electrical Properties: In semiconductors, impurities (dopants) drastically alter conductivity. For example, adding boron to silicon creates a p-type semiconductor.

			Optical Properties: Impurities can absorb or scatter light, influencing transparency or color.

			====Applications====
			Doping in Semiconductors: Controlled addition of impurities like phosphorus or boron to silicon enables the creation of Diodes or Transistors.

			Alloying: Mixing metals with specific impurities enhances their strength, corrosion resistance, or workability such as Steel.

	==Dislocations==		==Dislocations==

MaxwellH: /* Sources */

2024-12-07T02:47:49Z

Sources

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	==Sources==		==Sources==
	https://wisc.pb.unizin.org/minimisgenchem/chapter/types-of-unit-cells-body-centered-cubic-and-face-centered-cubic-m11q5/		https://wisc.pb.unizin.org/minimisgenchem/chapter/types-of-unit-cells-body-centered-cubic-and-face-centered-cubic-m11q5/

			https://wisc.pb.unizin.org/chem103and104/chapter/types-of-unit-cells-primitive-cubic-cell-m11q4/

MaxwellH at 02:41, 7 December 2024

2024-12-07T02:41:13Z

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	Crystalline structures are the foundation of solid-state materials, describing the orderly arrangement of atoms, ions, or molecules in three-dimensional space. These structures are characterized by their repeating patterns, known as lattices, which extend throughout the material. The study of crystalline structures is essential in understanding the physical and chemical properties of solids, including their strength, conductivity, thermal behavior, and optical properties.		Crystalline structures are the foundation of solid-state materials, describing the orderly arrangement of atoms, ions, or molecules in three-dimensional space. These structures are characterized by their repeating patterns, known as lattices, which extend throughout the material. The study of crystalline structures is essential in understanding the physical and chemical properties of solids, including their strength, conductivity, thermal behavior, and optical properties.

	~~[[File:CNX Chem 10 06 UnitCell1.jpg]]~~

	==Bravais lattices==		==Bravais lattices==
	At the heart of crystallography is the concept of the unit cell—the smallest repeating unit that defines the symmetry and geometry of the entire lattice. Unit cells can take on a variety of configurations, each classified under the Bravais lattices, which represent the 14 unique ways atoms can be arranged in space. We will only cover 3 of the main configurations.		At the heart of crystallography is the concept of the unit cell—the smallest repeating unit that defines the symmetry and geometry of the entire lattice. Unit cells can take on a variety of configurations, each classified under the Bravais lattices, which represent the 14 unique ways atoms can be arranged in space. We will only cover 3 of the main configurations.

			[[File:CNX Chem 10 06 UnitCell1.jpg]]

	The main types of configurations that a Bravais lattice can take are: Primitive, Body-Centered Cubic (BCC), and Face-Centered Cubic (FCC). These configurations describe how atoms are arranged within a unit cell and are essential for understanding the structure and properties of crystalline materials. Among these, Primitive is the least efficient and weakest in terms of packing and structural strength, as its atoms are arranged only at the corners of the unit cell, leaving significant empty space. BCC, with an additional atom at the center of the unit cell, is stronger and has a higher packing efficiency than Primitive. However, FCC is the most efficient and stable configuration, with atoms occupying the corners and centers of all cube faces, resulting in the highest packing density and contributing to greater ductility and strength in materials that adopt this structure. These differences in packing and arrangement significantly influence the material properties, including density, strength, and thermal and electrical conductivity.		The main types of configurations that a Bravais lattice can take are: Primitive, Body-Centered Cubic (BCC), and Face-Centered Cubic (FCC). These configurations describe how atoms are arranged within a unit cell and are essential for understanding the structure and properties of crystalline materials. Among these, Primitive is the least efficient and weakest in terms of packing and structural strength, as its atoms are arranged only at the corners of the unit cell, leaving significant empty space. BCC, with an additional atom at the center of the unit cell, is stronger and has a higher packing efficiency than Primitive. However, FCC is the most efficient and stable configuration, with atoms occupying the corners and centers of all cube faces, resulting in the highest packing density and contributing to greater ductility and strength in materials that adopt this structure. These differences in packing and arrangement significantly influence the material properties, including density, strength, and thermal and electrical conductivity.