Sketch the band structure of a Li AND a Si crystal. (ii) How would you expect the electrical conductivity in Li AND Si crystals to vary with temperature? (iii) Account for the fact that the conductivity of Si is enhanced by the addition of small amounts of B.

Sketch the band structure of a Li AND a Si crystal. (ii) How would you expect the electrical conductivity in Li AND Si crystals to vary with temperature? (iii) Account for the fact that the conductivity of Si is enhanced by the addition of small amounts of B.

Principles of Modern Chemistry

8th Edition

ISBN:9781305079113

Author:David W. Oxtoby, H. Pat Gillis, Laurie J. Butler

Publisher:David W. Oxtoby, H. Pat Gillis, Laurie J. Butler

Chapter22: Inorganic Materials

Section: Chapter Questions

Problem 31P

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Concept explainers

Crystallography

Crystallography is the category of science that focuses on the atomic and molecular arrangements with their bonding constituting the crystal structure. It is derived experimentally and originated in the year 1912. It is a combination of two words; those are crystal, meaning a cold drop, and graph, meaning writing.

Question

Sketch the band structure of a Li AND a Si crystal.

(ii) How would you expect the electrical conductivity in Li AND Si crystals to vary with temperature?

(iii) Account for the fact that the conductivity of Si is enhanced by the addition of small amounts of B.

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Step 1: Band theory

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Step 2: Band structure of Li

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Step 3: Band structure of Si

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Step 4: Variation of conductivity with temperature.

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Step 5: Increase in conductivity by the addition of B

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