Resistivity measurements at 300 K show that an annealed metal single crystal has a monovacancy concentration CV = 10-9. When the same crystal is quenched from a high temperature, the measurements indicate CV = 2x10-3. Calculate the temperature of the quench [Take Hf = 51.4 kJ/mol and R = 8.314 J/mol.K]. State any assumption involved. (5) (b) Explain why the esistivity of a metal is expected to be found more at room temperature after quenching. Hint: Use Matthiessen’s rule (find out by self-studying and cite the source.)
Resistivity measurements at 300 K show that an annealed metal single crystal has a monovacancy concentration CV = 10-9. When the same crystal is quenched from a high temperature, the measurements indicate CV = 2x10-3. Calculate the temperature of the quench [Take Hf = 51.4 kJ/mol and R = 8.314 J/mol.K]. State any assumption involved. (5) (b) Explain why the esistivity of a metal is expected to be found more at room temperature after quenching. Hint: Use Matthiessen’s rule (find out by self-studying and cite the source.)
Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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Resistivity measurements at 300 K show that an annealed metal single crystal has a
monovacancy concentration CV = 10-9. When the same crystal is quenched from a high
temperature, the measurements indicate CV = 2x10-3. Calculate the temperature of the
quench [Take Hf = 51.4 kJ/mol and R = 8.314 J/mol.K]. State any assumption involved. (5)
(b) Explain why the esistivity of a metal is expected to be found more at room temperature after quenching. Hint: Use Matthiessen’s rule (find out by self-studying and cite the
source.)
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