What Makes Metals Special?
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What is a key feature of metallic elements?
Conductivity which has the idea of a “sea of electrons”.
Define conduction
Essentially the “sea of electrons” is more a decription of the constant movement of electrons and holes.
What are holes when describing conduction?
Holes are valencies generated from an electron leaving a site where the hole has a positive charge.
What is used to explain metallic bonds in place of MO theory?
Band Theory
What is the Fermi level?
The highest point electrons will readily jump
What can improve semiconductor properties?
Doping-mixing small amounts of elements into the semiconductor system.
What is a p-type semiconductor?
These are made when “holes” are added. p=(+)
What is an n-type semiconductor?
These are made when electrons are added. n=(-)
Curie Temperature
The point where ferro and ferrimagnets order
Neel Temperature
The point were antiferromagnets order
Yes this is in the first flashcard set, but define it anyways. Tell me the three types of magnetism and describe them each.
Ferromagnet: When spins align paralell and all in the same direction Antiferromagnet: Spins couple anti-parralel to one another which cancels out any potential moment Ferrimagnet: A mixture of ferro and antiferro interactions, where the moments of a material align antiparallel, but don’t cancel out.
What law do we use to describe the magnetic coupling of the magnets?
The Curie Weiss Law (Review notes for equation)
Define the four points on the hysteresis loop. Which term is used to typically describe our magnets?
B_H=Energy Product M_r=Remnant Magnetization Ms=Magnetic Saturation Hc=Coercivity (We use this term to typically talk about magnets
Explain the difference between a soft magnet and a hard magnet.
Hard Magnet: Large Coercivity, High Remnant Magnetism Soft Magnet: Low Coercivity, High Magnetic Saturation.