18 Questions
What type of crystal defect occurs when a particle is missing from its regular site in the crystal lattice?
Vacancy defect
How are vacancies created in a crystal lattice?
By heating the substance
What can minimize the defects in a crystal lattice?
Heating the substance slowly
At what temperature are ideal crystals with no imperfections possible?
Absolute zero
Which type of crystal defect involves additional particles being present in the crystal lattice?
Self-interstitial defect
What happens to defects in a crystal when crystallization occurs at a faster rate?
Defects increase
What happens to the mass of a substance in a vacancy defect?
It decreases
What is the impact of a vacancy defect on the density of a substance?
The density decreases
What type of defect results when a particle is displaced within a crystal structure?
Interstitial defect
In a self interstitial defect, what occupies the interstitial sites in a crystal structure?
Particles from lattice points themselves
What happens to the mass of a substance in a self interstitial defect?
It remains unchanged
How does a self interstitial defect impact the density of a substance?
The density remains unchanged
Why is Frenkel defect not found in pure alkali metal halides?
The cations of alkali metals are too large to occupy interstitial spaces.
How can Frenkel defect be described in terms of vacancy and interstitial defects?
A combination of a vacancy defect and an interstitial defect.
What type of defect arises when the ratio of cations to anions becomes different from that indicated by the chemical formula?
Metal deficiency defect
In a nonstoichiometric compound with metal deficiency defects, what changes without affecting the crystal structure?
Stoichiometry
What kind of impurities can create vacancies in ionic solids?
Impurities with different oxidation states than host ions
Why do pure alkali metal halides not exhibit Frenkel defects?
The size of alkali metal cations prevents them from occupying interstitial spaces.
Test your knowledge on crystal defects and how they maintain electrical neutrality in solids. Learn about intentionally created defects for manipulating properties in crystalline solids, such as vacancy defects which decrease density without changing volume.
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