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Why aren't Frenkel defects observed in p...

Why aren't Frenkel defects observed in pure halides of alkali metals?

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Due to larger size of cations,
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Why is Frenkel defect not found in pure alkali metal halides ?

Why is Frenkel defect not shown by alkali metal halides?

Explain why the Ionisation potential of inert gases are very high white that of alkali metals are very low.

In an ideal crystal, the entropy of the constituents at absolute zero temperature (0K) is zero. However, the crystals generally suffer from certain defects also called imperfections They may be both electronic and atomic in nature. The atomic imperfections may be stoichiometric (Schottky and Frenkel defects) or non-stoichiometric (metal excees and metal deficiency defects). In addition to these, there are impurity defects which are caused by the addition of certain impurities of metals and this is known as dopping. The dopping leads to semi conductors which may be either n-type or p-type in nature. In stoichiometric defects, the ratio of positive and negative ions as indicated by chemical formula of the compound:

In an ideal crystal, the entropy of the constituents at absolute zero temperature (0K) is zero. However, the crystals generally suffer from certain defects also called imperfections They may be both electronic and atomic in nature. The atomic imperfections may be stoichiometric (Schottky and Frenkel defects) or non-stoichiometric (metal excees and metal deficiency defects). In addition to these, there are impurity defects which are caused by the addition of certain impurities of metals and this is known as dopping. The dopping leads to semi conductors which may be either n-type or p-type in nature. Which of the following is correct ?

In an ideal crystal, the entropy of the constituents at absolute zero temperature (0K) is zero. However, the crystals generally suffer from certain defects also called imperfections They may be both electronic and atomic in nature. The atomic imperfections may be stoichiometric (Schottky and Frenkel defects) or non-stoichiometric (metal excees and metal deficiency defects). In addition to these, there are impurity defects which are caused by the addition of certain impurities of metals and this is known as dopping. The dopping leads to semi conductors which may be either n-type or p-type in nature. Silicon doped with arsenic is

In an ideal crystal, the entropy of the constituents at absolute zero temperature (0K) is zero. However, the crystals generally suffer from certain defects also called imperfections They may be both electronic and atomic in nature. The atomic imperfections may be stoichiometric (Schottky and Frenkel defects) or non-stoichiometric (metal excees and metal deficiency defects). In addition to these, there are impurity defects which are caused by the addition of certain impurities of metals and this is known as dopping. The dopping leads to semi conductors which may be either n-type or p-type in nature. Zinc oxide (ZnO) is white when cold and yellow when hot. It is due to the development of :

In an ideal crystal, the entropy of the constituents at absolute zero temperature (0K) is zero. However, the crystals generally suffer from certain defects also called imperfections They may be both electronic and atomic in nature. The atomic imperfections may be stoichiometric (Schottky and Frenkel defects) or non-stoichiometric (metal excees and metal deficiency defects). In addition to these, there are impurity defects which are caused by the addition of certain impurities of metals and this is known as dopping. The dopping leads to semi conductors which may be either n-type or p-type in nature. Which is the correct statement regarding F-centres ?

Why are alkali metals not found in nature ?

Why are alkali metals not found in nature?

CHHAYA PUBLICATION-SOLID STATE-EXERCISE
  1. Arrange simple, body-centred and face-centred cubic unit cells in orde...

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  2. What are non-stoichiometric defects? Give two example of such defects.

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  3. Why aren't Frenkel defects observed in pure halides of alkali metals?

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  4. Why does KCl become violet in colour when it is heated in presence of ...

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  5. What do you understand by a tetrahedral void in a close-packed structu...

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  6. What do you understand by an octahedral void in a close-packed crystal...

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  7. Metallic Zn has a hexagonal close-packed array of Zn atoms. How many v...

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  8. What type of semiconductor (n-or p-type) is formed when pure Ge is dop...

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  9. What type of semiconductor (n- or p-type) is formed when pure Si is do...

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  10. Why does the electrical conductivity of semiconductors increase with r...

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  11. Why is the electrical conductivity of metals found to decrease with ri...

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  12. Why does the electrical conductivity of germanium crystal increase whe...

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  13. Write the differences between crystalline and amorphous solids.

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  14. On the basis of the nature of constituent particles, how are crystalli...

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  15. Between square and hexagonal close packing in two dimensions, which on...

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  16. Define: (i) Cubic close-packed structure (ii) Hexagonal close-packed s...

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  17. Show that 26% of the total volume of a face-centred cubic unit cell re...

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  18. Show that the number of octahedral voids in a ccp or an hcp structure ...

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  19. Explain how the electrical neutrality of an ionic crystal is maintaine...

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  20. Table salt (NaCl), which is essentially white in colour, is found yell...

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