1. Cobalt oxide (Co²* and O²) forms a crystalline ceramic structure. Oxygen has an ionic radius of 0.140 nm and cobalt has an ionic radius of 0.072 nm. a) Calculate the radius ratio, rc/ra. b) Based on the radius ratio and ionic charge: Circle the stoichiometry: AX • Circle the crystal structure: AX2 A2X ABX3 Zinc Blende Cesium Chloride Sodium Chloride Perovskite Fluorite • Justify your answers for the above two questions using one or two sentences. Calculate the density of CoO in units of g/cm³.
1. Cobalt oxide (Co²* and O²) forms a crystalline ceramic structure. Oxygen has an ionic radius of 0.140 nm and cobalt has an ionic radius of 0.072 nm. a) Calculate the radius ratio, rc/ra. b) Based on the radius ratio and ionic charge: Circle the stoichiometry: AX • Circle the crystal structure: AX2 A2X ABX3 Zinc Blende Cesium Chloride Sodium Chloride Perovskite Fluorite • Justify your answers for the above two questions using one or two sentences. Calculate the density of CoO in units of g/cm³.
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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Transcribed Image Text:1.
Cobalt oxide (Co2+ and O²-) forms a crystalline ceramic structure. Oxygen has an ionic
radius of 0.140 nm and cobalt has an ionic radius of 0.072 nm.
a)
Calculate the radius ratio, rc/ra.
b)
Based on the radius ratio and ionic charge:
Circle the stoichiometry: AX
• Circle the crystal structure:
Zinc Blende
AX2
A2X
ABX3
Cesium Chloride
Sodium Chloride
Perovskite
Fluorite
• Justify your answers for the above two questions using one or two sentences.
Calculate the density of CoO in units of g/cm'.
Calculate the number of Frenkel defects per cm' of CoO at 500°C. Assume an activation
d)
energy for Frenkel defect formation in CoO of 0.5 eV.
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