2. (3 pts) Consider the unit cell for the spinel compound,CrFe204. How many total particles are in the unit cell?Also, show how the number of particles and theirpositions are consistent with the CrFe204stoichiometry - this may or may not be reflected by theparticle colors in the diagram. (HINT: In the diagram,the blue particle is in an interior position while each redparticle is either in a corner or face position.)

Corner atoms:Each corner atom is shared by a total of 8 unit cells.Therefore, its contribution to…

Answered: 2. (3 pts) Consider the unit cell for…

Physical Chemistry

2nd Edition

ISBN:9781133958437

Author:Ball, David W. (david Warren), BAER, Tomas

Publisher:Ball, David W. (david Warren), BAER, Tomas

Chapter21: The Solid State: Crystals

Section: Chapter Questions

Problem 21.47E

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Similar questions

Outline a two-dimensional unit cell for the pattern shown here. If the black squares are labeled A and the white squares are B, what is the simplest formula for a compound based on this pattern?
What is the coordination number of Cs in CsCl? of Na in NaCl? of Zn2 in ZnS?
Outline a two-dimensional unit cell for the pattern shown here. If the black squares are labeled A and the white squares are B, what is the simplest formula for a compound based on this pattern?
Describe the crystal structure of Pt, which crystallizes with four equivalent metal atoms in a cubic unit cell.
If one edge of the silicon carbide unit cell is 436.0 pm, what is the calculated density of this compound? (a) 0.803 g/cm3 (b) 0311g/cm3 (c) 321 g/cm3
Use the web to look up information on nanotubes. Distinguish between single-walled and double-walled nanotubes.
How many different unit cells can a crystal have if the unit cell a has all 90 angles between its crystal axes; b has all of its unit cell dimensions the same length; c has at least one 90 angle between axes; d has no perpendicular axes or equivalent unit cell dimensions?
The coordination number of uniformly sized spheres in a cubic closest-packing (FCC) array is 12. Give the coordination number of each atom in (a) a simple cubic lattice. (b) a body-centered cubic lattice.
8.97 The doping of semiconductors can be done with enough precision to tune the size of the band gap in the material. Generally, in order to have a larger band gap, the dopant should be smaller than the main material. If you are a materials engineer and need a semiconductor that has lower conductivity thin pure silicon, what clement or elements could you use as your dopant? (You do not want either an n- or a p- type material) Explain your reasoning.
Which solid phase that is, which allotrope of carbon is more stable, graphite or diamond? You should consult some of the tables in the thermodynamics section of this text.. Both solid phases exist under normal conditions of pressure and temperature. Explain why this is so, given that one solid phase is more thermodynamically stable than the other. Do their unit cells provide any suggestion for their relative stabilities?
2. Consider the zinc blend (ZnS) crystal structure shown below, a) Show that the minimum cation-anion radius ratio is 0.225. b) Develop a general equation to relate the unit cell edge length (a) to the radius of Zn²+ and S²- and calculate the theoretical density of the crystal structure in g/cm³. (8 The ionic radii of Zn²+ and S² are 0.060 and 0.184 nm, respectively. 3. An alternating copolymer is n 250,000 g/mol and ethyla O sions of the HCP crystal structure, 0 2n S
Two possible cubic crystal structures are shown in figure 3. Part (a) shows the fcc structure, in which atoms are touching along a face-diagonal. Part (b) shows the bcc structure,in which atoms are touching along a body diagonal of the cube.Calculate the packing fractions of each of these structures. Which one of them is closepacked?

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