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This implies that the mechanical response has a time-dependence. Plasticity — Materials that behave elastically generally do so when the applied stress is less than a yield value. When the stress is greater than the yield stress, the material behaves plastically and does not return to its previous state. That is, irreversible plastic deformation or viscous flow occurs after yield that is permanent.
Many materials become weaker at high temperatures. Materials that retain their strength at high temperatures, called refractory materials , are useful for many purposes. Normal modes of atomic vibration in a crystalline solid. Because solids have thermal energy , their atoms vibrate about fixed mean positions within the ordered or disordered lattice.
The spectrum of lattice vibrations in a crystalline or glassy network provides the foundation for the kinetic theory of solids. This motion occurs at the atomic level, and thus cannot be observed or detected without highly specialized equipment, such as that used in spectroscopy. Thermal properties of solids include thermal conductivity , which is the property of a material that indicates its ability to conduct heat.
Solids also have a specific heat capacity , which is the capacity of a material to store energy in the form of heat or thermal lattice vibrations. Play media Video of superconducting levitation of YBCO Electrical properties include conductivity , resistance, impedance and capacitance. Electrical conductors such as metals and alloys are contrasted with electrical insulators such as glasses and ceramics.
Semiconductors behave somewhere in between. Whereas conductivity in metals is caused by electrons, both electrons and holes contribute to current in semiconductors. Alternatively, ions support electric current in ionic conductors.
Many materials also exhibit superconductivity at low temperatures; they include metallic elements such as tin and aluminium, various metallic alloys, some heavily doped semiconductors, and certain ceramics.
The electrical resistivity of most electrical metallic conductors generally decreases gradually as the temperature is lowered, but remains finite. In a superconductor, however, the resistance drops abruptly to zero when the material is cooled below its critical temperature.
An electric current flowing in a loop of superconducting wire can persist indefinitely with no power source. A dielectric , or electrical insulator, is a substance that is highly resistant to the flow of electric current.
A dielectric, such as plastic, tends to concentrate an applied electric field within itself, which property is used in capacitors. A capacitor is an electrical device that can store energy in the electric field between a pair of closely spaced conductors called 'plates'.
When voltage is applied to the capacitor, electric charges of equal magnitude, but opposite polarity, build up on each plate. Capacitors are used in electrical circuits as energy-storage devices, as well as in electronic filters to differentiate between high-frequency and low-frequency signals.
Electro-mechanical[ edit ] Piezoelectricity is the ability of crystals to generate a voltage in response to an applied mechanical stress. The piezoelectric effect is reversible in that piezoelectric crystals, when subjected to an externally applied voltage, can change shape by a small amount. Polymer materials like rubber, wool, hair, wood fiber, and silk often behave as electrets.
For example, the polymer polyvinylidene fluoride PVDF exhibits a piezoelectric response several times larger than the traditional piezoelectric material quartz crystalline SiO2. Optical[ edit ] Materials can transmit e. Many materials will transmit some wavelengths while blocking others. For example, window glass is transparent to visible light , but much less so to most of the frequencies of ultraviolet light that cause sunburn.
This property is used for frequency-selective optical filters, which can alter the color of incident light. For some purposes, both the optical and mechanical properties of a material can be of interest. For example, the sensors on an infrared homing "heat-seeking" missile must be protected by a cover that is transparent to infrared radiation. Best Paper Solutions. Anna university b.
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