phychem solid

Perfect crystal structure

Definition of solid state and unit cell and characteristics

Laws governing crystallography

-charaterization of solid

• Investigation of crystall structure

• X-ray crystollography

Solid state chem

Branch of phychem deals with synthesis, structures, properties of solid phase materiala

Crystalline solid

Regular array of repating identical units and have a definite melting point

Amorphous solid

No repeating pattern and extensively disordered non-crystalline

Polymorphism

Phenomenon where compound can precipitate to form crystals

Dimorphism

Property of materials occuring in 2 crystalline form have broad range of melting points

Isomorphism

Crystallization of different compound in the same form

Allotrophy

Cganges in properties without change in state

Lattice

Infinite 1,2,3 D arrangement of points, which defines the vasic structure of the crystal

Basis/ motif

Group of one or more atoms located in particular way with respect to each other and associated with each lattice point

Point lattice

Lattice constructed from intersection of three sets of plane seperated from each other with equal distance

Space lattice

Pattern formed by points representing the location of regularly repeating motifs

Bravais lattice

Unique 3-D arrangement of lattice points named after augusts bravais

Primitive lattice

Lattice point at the corners

Centered lattice

Additional points from those at the corners

X ray crystallography

Application of xray diffraction techniques and principles in the investigation of crystal forms, structure and properties

Diffraction phenomena

Interference caused by an object in the path of waves and occurs when the dimension of the diffracting object is comparable to the wavelength of radiation

Diffraction pattern

Varying intensity than results

Diffracted beam

Composed of big number of scattered waves that naturally reinforce one another

X ray

Electromagnetic radiation w/ high energy and low wavelengths which is comparable to bond strenght

Bremsstralung

German for decelerated rays