Bases of Existence of Properties in Materials

Electrical Engineering Materials Atom Atomic Energy Levels Classification Materials Classification of Electrical Materials Electron Configuration of Atom Properties of Materials Mechanical Properties Materials Rutherford Atomic Model Bohrs Atomic Model Chemical Properties of Materials Energy Bands in Crystals Properties of Materials Fermi Dirac Distribution Function Magnetic Properties Materials Thermionic Emission Selection of Materials Existence of Properties in Materials Quantum Numbers Conducting Material High Resistive Materials Factors Effecting Resistivity Materials Used for Heating Elements Materials Used for Precious Works Materials Used for Transmission Line Conductor Stranded Conductors Electrical Conductor Materials used for Rheostats Materials for Lamp Filaments Classification Conducting Materials Applications of Carbon Materials Electrical Contact Materials Bimetals Ionic Polarization Piezoelectricity Dielectric Materials Mechanism of Polarization Dielectric Material Orientational Polarization Electric Arc Furnace Thermal Conductivity of Metals Free Electron Theory Magnetostriction Antiferroelectricity Ferroelectric Materials Electronic Polarization Ferromagnetic Materials

The properties of material change matter to matter. Basically the properties of material depends on their chemical composition, electron configuration, atomic structure, impurities / imperfections, manufacturing process and mechanical heat treatment process. Chemical composition of material represents that the elements which are consisted in material. The chemical composition decides whether the material is organic or inorganic, acid or alkaline etc. Electron configuration represents the distribution of electron in atom over various shells and subshells.
The electrons configuration decides the conductivity of material. Which decides whether the material is good or bad conductor of electricity. Magnetic properties of materials also depend on electron configuration of atom.

The magnetic properties of material is very much affected by the distribution of electron in subshells and their spin direction. Atomic structure of material indicates the manner in which the atoms are connected to each other such as crystalline or amorphous structures. The relationship between properties and atomic structure exists within material such as Metals, Ceramics and Polymers, is shown in table below.

Sl. No.	Atomic Structure	Metals	Ceramics	Polymers (Plastic & rubber)
1	Crystallinity	Crystalline	Crystalline Non-crystalline Crystalline and Non Crystalline Phase	Non crystalline
2	Bonding	Metallic	Ionic and Covalent	Covalent plus secondary
3	Important properties	Excellent conductor of Heat Excellent conductor of Electricity Usually malleable and ductile Opaque Lustrous Moderate to high melting point	For Crystalline structure Nonconductor of heat Nonconductor of Electricity Hard High melting point For Non-crystalline Nonconductor of heat Nonconductor of Electricity Hard Brittle No definite melting point For Crystalline and non crystalline phase Very poor conductor of heat Very poor conductor of electricity Hard Brittle Low strength High melting point	Very poor conductor of heat Very poor conductor of Electricity Low strength Deformed plastically with small load Low melting point

Moreover, in bulk material the properties of materials is also effected by the nature and distribution of impurities or imperfections, either chemical or architectural. The impurities or imperfections effects the strength of material very much. The conductivity of metals is effected very much by impurities in metal. These impurities disturb the crystalline structure of metal and make it irregular. This irregularity in crystalline structure disturbs the movement of electrons through metal. Which results in reduction of conductivity of metal. A small level of impurities results in considerable reduction in conductivity of metal. The properties of material are also effected by manufacturing process as well as mechanical heat treatment processes i.e. Hardening, Annealing, age hardening, quenching, hot rolling, cold rolling etc. These mechanical heat treatment processes not only effect the mechanical properties of material but effect electrical properties also.

Comments

Bases of Existence of Properties in Materials

Connects

Contents