ETYMOLOGIA SŁOWA FRENKEL DEFECT
Named after I. I. Frenkel (1894–1952), Russian physicist.
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1
Competition Science Vision
The number of Frenkel defects formed per cm3 is given by Here N is number of
sites per cm3 that are vacant, N' is the number of alternative interstitial positions
per cm3, \Nf is the work necessary to form a Frenkel defect, k is the gas constant ...
2
Principles and Applications of Chemical Defects
In any crystal of formula MX, a Frenkel defect consists of one interstitial atom plus
one vacant site in the sub-lattice where that atom would normally be found.
Because we are simply moving ions around within the crystal we do not find that
we ...
Richard J.D. Tilley, 1998
3
Objective Chemistry For Iit Entrance
Due to Frenkel defect, dielectric constant of the crystal (a) remains unaffected(b)
increases (c) decreases (d) becomes zero 107. Frenkel defect generally appears
in (a) AgBr (b) ZnS (c) Agl (d) All of these 1 08. Photo-sensitivity of AgBr is due to
...
4
Defects in Optoelectronic Materials
The reaction of carbon interstitial formation can be explained by extrinsic Frenkel
defect formation mechanism or kick-out mechanism by As interstitials. In other
words, the reaction of carbon interstitial formation can be expressed by Cas ^ Ci ...
7.2.4 Frenkel Defect In an ionic crystal, if a cation is removed from its regular site
and transferred to an interstitial site, then it is said to be Frenkel defect. Since the
crystal demands charge neutrality, the cation vacancy does not take place alone
...
6
Chemistry Vol (1 and 2)
Frenkel Defect : In this defect a vacancy or hole may exist in the lattice because
one ion occupies a position on the interstitial space rather than its appropriate
site in the lattice. Positive ions are smaller hence they are more likely to occupy ...
AK Srivastava and PC Jain
7
Target 2011: Chemistry 12
What is Frenkel defect? Ans. In the Frenkel defect, an ion is missing from the
lattice site and occupies an interstitial site due to which electrical neutrality as
well as stoichiometry of the compound are maintained. 9. Which stoichiometric
defects ...
8
Question Bank In Chemistry For Class Xii
What is Frenkel defect? Ans. In the Frenkel defect, an ion is missing from the
lattice site and occupies an interstitial site due to which electrical neutrality as
well as stoichiometry of the compound are maintained. 9. Which stoichiometric
defects ...
9
The Pearson Guide to Objective Chemistry for the AIEEE
ZnO is white when cold and yellow when heated. It is due to the development of (
a) metal excess defect (b) Frenkel defect (c) Schottky defect " (d) both (b) and (c)
□ 28. Which of the following is not correct consequences of Schottky defect?
10
Understanding Solids: The Science of Materials
One Frenkel defect consists of an interstitial ion plus a vacancy (Figure 3.11b).
Because the total number of ions present does not change, there is no need for
charge balance to be considered. For example, a Frenkel defect on the anion ...
Richard J. D. Tilley, 2013
