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20: Conductivity and Magnetism

Last updated

Aug 20, 2021
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- 19.6: Amorphous Alloys
- 20.1: Conduction in Metals

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20.1: Conduction in Metals
20.2: Semiconductors- Band Gaps, Colors, Conductivity and Doping
There are a number of places where we find semiconductors in the periodic table.
20.3: Semiconductor p-n Junctions
20.4: Diodes, LEDs and Solar Cells
Diodes are semiconductor devices that allow current to flow in only one direction. Diodes act as rectifiers in electronic circuits, and also as efficient light emitters (in LEDs) and solar cells (in photovoltaics). The basic structure of a diode is a junction between a p-type and an n-type semiconductor, called a p-n junction. Typically, diodes are made from a single semiconductor crystal into which p- and n-dopants are introduced.
20.5: Atomic Orbitals and Magnetism
20.6: Ferro-, Ferri- and Antiferromagnetism
The magnetism of metals and other materials are determined by the orbital and spin motions of the unpaired electrons and the way in which unpaired electrons align with each other. All magnetic substances are paramagnetic at sufficiently high temperature, where the thermal energy (kT) exceeds the interaction energy between spins on neighboring atoms. Below a certain critical temperature, spins can adopt different kinds of ordered arrangements.

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