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Uses of Lanthanides

Due to schott...

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Due to schottky defect density and stability decreases but electrical conductivity increases while due to frenkel defect density remains unaffected,stability decreases but electrical conductivity and dielectic cons†an t increases . Give reason

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N a C l

shows Schottky defects and

A g C l

Frenkel defects. Their electrical conductivity is due to ________.

Q. Assertion :Due to Frenkel defect, density of the crystalline solid decreases. Reason: In Frenkel defect, cation or anion leaves the crystal.

Q. Density of a crystal decreases due to Schottky defect and remains constant due to Frankel defect.
If true enter 1,else enter 0.

Q. Account for the following:
(i) Schottky defects lower the density of related solids.
(ii) Conductivity of silicon increases on doping it with phosphorus.

Q. Match the defects given in column I with statements given in column II and mark the appropriate choice.

	Column I		Column II
(A)	Simple vacancy defect	(i)	Shown by non-ionic solids and increases the density of the solid.
(B)	Simple interstitial defect	(ii)	Shown by ionic solution and decreases the density of the solid
(C)	Frenkel defect	(iii)	Shown by non-ionic solids and decreases the density of the solid
(D)	Schottky defect	(iv)	Shown by ionic solids and density of the solid remains the same

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Uses of Lanthanides

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