Ionic Lattices, Superconductors and Semiconductors
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What is a cation?
A positively charged ion
What is an anion?
A negatively charged ion
If ions are around the same size in an ionic lattice what type of structure will they likely form?
The caesium chloride structure
If one ion is much bigger than the other in an ionic lattice what type of structure will they likely form?
The sodium chloride structure
In the caesium chloride structure what is the ratio of caesium ions to chloride ions?
In the sodium chloride structure what is the ratio of sodium ions to chloride ions?
What coordination number does the caesium chloride structure have?
What coordination number does the sodium chloride number have?
What are superconductors?
Superconductors are a special class of materials that have zero electrical resistance at temperatures near absolute zero
Why is the application of superconduction at these temperatures impractical?
As achieving temperatures near absolute zero is difficult and costly
What are some of the future applications of superconductors?
- Frictionless transport systems
- Power transmission
What are semiconductors?
A covalent element such as silicon or germanium which has a higher conductivity than that of a typical non-metal but a much lower conductivity than that of a metal is described as a semiconductor
The electrical conductivity of semiconductors _______ with increasing temperature?
The electrical conductivity of semiconductors increases on exposure to light. This is known as the _______ effect?
What is doping?
The deliberate addition of impurities to improve conductivity
What are the main current carriers in n-type semiconductors?
What are the main current carriers in p-type semiconductors?
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