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1. Between two types of crystal structure, it tells which can contain more atomic spheres
in each of their unit cell.
Atomic Packing Factor
Basis:
BOOK
It is indicated in the Chapter 3: The Structure of Crystalline Solids of
the book of William Callister, Materials Science and Engineering an
Introduction (Eighth Edition).
Chapter 3.4 Metallic Crystal Structures, the meaning of Atomic
Packing Factor the fraction of solid sphere volume in the unit cell.
INTERNET
It is indicated in the link:
https://www.corrosionpedia.com/definition/1603/packing-factor-
slipsystems The meaning of Atomic Packing Factor the fraction of the
volume of a unit cell that is occupied by "hard sphere" atoms or ions. It
is the sum of the sphere volumes of all atoms within a unit cell
(assuming the atomic hard-sphere model) divided by the unit cell
volume.
2. In cubic crystals, planes and directions having the same indices are parallel to one
another.
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True or False?
True
Basis:
INTERNET
It is indicated in the link:
parallel-planes-in-a-crystalarea-sameb-different/ that planes and
directions having the same indices are parallel to one another since
in Miller indices they are all equally spaced in all set of parallel
planes.
3. The bar over the appropriate index indicates ____________.
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Negative Indices
Basis:
BOOK
It is indicated in the Chapter 3: The Structure of Crystalline Solids
of the book of William Callister, Materials Science and Engineering
an Introduction (Eighth Edition).
Chapter 3.6 Metallic Crystal Structures, the meaning of
Negative Indices are represented by a bar over the appropriate
index.
INTERNET
It is indicated in the link:
http://courses.washington.edu/mse170/lecture_notes/zhangF08/l
ecture5.pdf That the bar over the index are Negative Index or
Negative Indices.
4. A. In a Hexagonal Closed Packed Structure, each particle remains in contact with 6
particles. B.) In Body Centered Cubic, 32% of the entire cube is unused space.
Both A and B are False
Both A and B are True
Only A is True
Only B is True
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Only B is True
Basis:
INTERNET
MANUAL
COMPUTATION
AND
ILLUSTRATION
5. A BCC unit cell is located at x, y, z axis. One of its corner atoms (atom 6) is located at
point (0,0,1), two others are at point (1,0,0) and point (0,1,0). What is the k index
number of the plane that intersects atom 6 location point, point (0, 2/3, 0) and point
(3, 0, 0)?
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The k index is 9
Basis:
INTERNET
To solve this I watched this video
https://youtu.be/LcoUFX3_A1s
MANUAL
COMPUTATION
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6. A set of whole numbers to represent a plane or a direction inside a single crystal.
Miller Indices
Basis:
INTERNET
It is indicated in the link:
https://www.britannica.com/science/Miller-indices That Miller
Indices is a group of three numbers that indicates the orientation of
a plane or set of parallel planes of atoms in a crystal.

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