Please correct answer and don't use hand raiting 6. (a) In the pattern of dots please sketch the primitive unit cell andthe centered, higher symmetry unit cell.(b) Write down the unit cell parameter(s) (a, b, c, a, ẞ, y) needed todescribecell choice fromthenon-primitive(a).7. In the pattern below sketch the unit cell and circle the asymmetric unit. Is the unit cell primitive orcentered?2

Question 6 part aPrimitive unit cell:Centered, sigher symmetry unit cell:Question 7To identify the…

Answered: 6. (a) In the pattern of dots please…

Principles of Modern Chemistry

8th Edition

ISBN:9781305079113

Author:David W. Oxtoby, H. Pat Gillis, Laurie J. Butler

Publisher:David W. Oxtoby, H. Pat Gillis, Laurie J. Butler

Chapter21: Structure And Bonding In Solids

Section: Chapter Questions

Problem 18P

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What is the coordination number of Cs in CsCl? of Na in NaCl? of Zn2 in ZnS?
Define the following:(i) Primitive unit cell (ii) Schottky defect (iii)Ferromagnetism.
2.4 2.5 The unit cell for Platinum (Pt) has atoms which are located at each of the corners and at the centre of all the unit cell faces. The density and atomic weight of Pt are 21.45 g/cm³ and 195.08 g/mol, respectively. Given that the Avogadro's Number is 6.023 x 1023 atoms/mol, (a) sketch the atomic arrangement on the (010) plane of the unit cell. (b) determine the lattice constant, a of Pt atom. (c) calculate the atomic radius of Pt atom. A sample of BCC iron (Fe) was placed in an X-ray diffractometer using incoming X-rays with a wavelength, λ = 0.1541 nm. Diffraction from the {110} planes was obtained at 20 = 44.704°. Assuming that the order of reflection is 1, calculate: (a) the interplanar spacing of the planes (b) the value for the lattice constant, a for BCC Fe
Sketch the following planes and directions within a cubic unit cell
4.50 Sketch the atomic packing of (a) the (100) plane for the BCC crystal structure, and (b) the (201) plane for the FCC crystal structure (similar to Figures 4.206 and 4.216).
How will you distinguish between the following pairs of terms:(i) Tetrahedral and octahedral voids(ii) Crystal lattice and unit cell
7. A mineral composed of Sr, O, and Ti, has the cubic unit cell shown in the drawing. The oxygens are on the faces of the unit cell. (a) What is the empirical formula of this mineral? (b) How many oxygens are 車 Strontium O Oxygen Titanium coordinated to titanium? (c) To see the full coordination environment of the other ions, we have to consider neighboring unit cells. How many oxygens are coordinated to strontium?
2) Draw BCC unit cells with the following planes/vectors A: (111) B: [010] C: (221)
(a) The density of diamond is 3.5 g/cm3, and that ofgraphite is 2.3 g/cm3. Based on the structure of buckminsterfullerene,what would you expect its density to berelative to these other forms of carbon? (b) X-ray diffractionstudies of buckminsterfullerene show that it has aface-centered cubic lattice of C60 molecules. The length ofan edge of the unit cell is 14.2 Å. Calculate the density ofbuckminsterfullerene.
9. For a two dimensional lattice with, a1= a a2= a/2 P- T1/3 (a) what is the area of a primitive cell? (b) show that the lattice is a rectangular lattice? (c) draw the Wigner-Seitz cell of this lattice and show that the area of the Wigner-Seitz cell is the same as in (a).
I
3.60 (a) What are the direction indices for a vec- 231 in a 342 11 tor that passes from point 10 to point 32 tetragonal unit cell? (b) Repeat part (a) for a rhombohedral unit cell.

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