(Multiple choice) Which one of the following statements is true? Explain every o
ID: 1468938 • Letter: #
Question
(Multiple choice) Which one of the following statements is true? Explain every option. (a) The addition of Ca to ZrO2 creates Shottky defects in the ZrO2. (b) Inorganic glasses are annealed by heating them to temperatures above the softening point. (c) Specific volume is the same as mass per unit volume. (d) The diffusion of oxygen atoms through a Ca-doped layer of ZrO2 is used to measure the concentration of oxygen dissolved in molten steel. (e) The addition of Mg to ZrO2 does not create Frenkel defects in the ZrO2.
Explanation / Answer
(a) The addition of Ca to ZrO2 creates Shottky defects in the ZrO2. (FALSE)
(the addition of Ca to ZrO2 creates anion vacancies. A shottky defect is a paired set of cation & anion vacancies)
(b) Inorganic glasses are annealed by heating them to temperatures above the softening point. (FALSE)
(the annealing range is below the softening point).
(c) Specific volume is the same as mass per unit volume. (FALSE)
(specific volume is defined as the volume per unit mass)
(d) The diffusion of oxygen atoms through a Ca-doped layer of ZrO2 is used to measure the concentration of oxygen dissolved in molten steel. (FALSE)
(oxygen ions diffuse through the Ca dopped ZrO2)
(e) The addition of Mg to ZrO2 does not create Frenkel defects in the ZrO2. (TRUE)
(frenkel defects are self-interstitials)
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