Solid State of Matter Lecture Notes

Flashcards covering key concepts from the lecture on the solid state of matter.

Solid State

Characterized by strong interparticle forces leading to definite shape and volume.

Crystalline Solids

Solids with a regular periodic arrangement of particles and sharp melting points.

Amorphous Solids

Solids with randomly arranged particles that do not have long range order and melt gradually.

Isomorphism

The phenomenon where two or more substances have the same crystal structure with the same atomic ratio.

Polymorphism

The ability of a single substance to exist in two or more different crystalline forms.

Ionic Crystals

Crystalline solids composed of charged ions held together by electrostatic forces.

Covalent Network Crystals

Crystals consisting of a continuous network of covalently bonded atoms, forming a giant molecule.

Molecular Crystals

Solids composed of molecules held together by weak intermolecular forces, resulting in lower melting points.

Metallic Crystals

Crystals formed by metallic atoms held together by metallic bonds, allowing for conductivity.

Coordination Number

The number of nearest neighbor particles surrounding a given particle in a crystal.

Unit Cell

The smallest repeating unit in a crystal lattice that defines the entire structure.

Vacancy Defect

A point defect where a lattice site is unoccupied by an atom or ion.

Frenkel Defect

A point defect where an ion occupies an interstitial site instead of its regular lattice position.

Schottky Defect

A defect involving vacancies of cations and anions in an ionic compound.

Doping

The process of adding impurities to a semiconductor to enhance its electrical conductivity.

n-type Semiconductor

A semiconductor doped with elements that provide extra electrons, increasing conductivity.

p-type Semiconductor

A semiconductor doped with elements that create holes, decreasing electron density and creating positive charge carriers.

Diamagnetic Solids

Materials with all paired electrons, exhibiting weak repulsion in a magnetic field.

Paramagnetic Solids

Materials with unpaired electrons, exhibiting weak attraction to magnetic fields.

Ferromagnetism

The property of materials that can become permanently magnetized due to a high density of unpaired electrons.

Bravais Lattices

The fourteen distinct arrangements of points in a three-dimensional space used to define crystal structures.

Solid state

Characterized by strong interparticle forces of attraction, giving solids a definite shape and volume.

Crystalline solids

Solids with a regular and periodic arrangement of constituent particles that extend over long ranges, exhibiting sharp melting points and specific directional properties.

Amorphous solids

Solids where constituent particles are randomly arranged without long-range order, lacking sharp melting points.

Isomorphism

The condition of two or more substances having the same crystal structure despite different chemical compositions.

Polymorphism

The ability of a single substance to exist in two or more different forms or crystal structures.

Ionic crystals

Crystalline structures composed of charged ions held together by ionic bonds, characterized by hardness, brittleness, and high melting points.

Covalent network crystals

Crystalline structures consisting of atoms bonded by a continuous network of covalent bonds, resulting in high hardness and high melting points.

Molecular solids

Solids made of molecules characterized by weak intermolecular forces, generally with low melting points and poor electrical conductivity.

Metallic crystals

Crystalline structures formed by metallic atoms, characterized by delocalized electrons and strong metallic bonding.

Unit cell

The smallest repeating structural unit of a crystalline solid, defining the crystal's geometry.

Coordination number

The number of nearest neighboring atoms or ions surrounding a particle in a crystal lattice.

Packing efficiency

The fraction of volume in a crystal structure that is occupied by particles.

Schottky defect

A point defect in ionic solids whereby equal numbers of cations and anions are missing from the lattice structure.

Frenkel defect

A point defect where an ion is displaced from its regular site and occupies an interstitial position.

Intrinsic semiconductor

A pure semiconductor material with low electrical conductivity that increases with temperature.

Extrinsic semiconductor

Doped semiconductor material that has increased conductivity due to the addition of impurities.

n-type semiconductor

A type of extrinsic semiconductor that contains excess electrons in the conduction band due to doping.

p-type semiconductor

A type of extrinsic semiconductor that contains holes in the valence band due to doping with elements that create vacancies.

Diamagnetic solids

Solids where all electrons are paired, resulting in a weak repulsion from magnetic fields.

Paramagnetic solids

Solids with unpaired electrons that are weakly attracted to magnetic fields only in the presence of an external magnetic source.

Ferromagnetic substances

Materials that can be permanently magnetized and retain magnetic properties even after the removal of an external magnetic field.