In stoichiometric zirconia ZrO2 the Schottky defects are the predominant equilibrium point defects. Often soluble oxide Y2O3 is added to ZrO2 to stabilize the high temperature tetragonal phase. It is reasonable to assume that on addition of Y2O3 to ZrO2, only vacancies form and no interstitial defects are formed. (a) Derive an expression for the equilibrium cation vacancy site fraction that will form. (b) Discuss how the self-diffusion of the cations will be affected by the addition of Y2O3.
In stoichiometric zirconia ZrO2 the Schottky defects are the predominant equilibrium point defects. Often soluble oxide Y2O3 is added to ZrO2 to stabilize the high temperature tetragonal phase. It is reasonable to assume that on addition of Y2O3 to ZrO2, only vacancies form and no interstitial defects are formed. (a) Derive an expression for the equilibrium cation vacancy site fraction that will form. (b) Discuss how the self-diffusion of the cations will be affected by the addition of Y2O3.
Introduction to Chemical Engineering Thermodynamics
8th Edition
ISBN:9781259696527
Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Chapter1: Introduction
Section: Chapter Questions
Problem 1.1P
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In stoichiometric zirconia ZrO2 the Schottky defects are the predominant equilibrium point defects. Often
soluble oxide Y2O3 is added to ZrO2 to stabilize the high temperature tetragonal phase. It is reasonable to
assume that on addition of Y2O3 to ZrO2, only vacancies form and no interstitial defects are formed.
(a) Derive an expression for the equilibrium cation vacancy site fraction that will form.
(b) Discuss how the self-diffusion of the cations will be affected by the addition of Y2O3.
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Step 1: a)Expression for equilibrium cation vacancy site fraction b)Explain how Y2O3 affect diffusing cation
VIEWStep 2: Derive expression for the equilibrium cation vacancy site fraction that will form.
VIEWStep 3: Explain how the self-diffusion of the cations will be affected by the addition of Y2O3.
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