lec9-crystal structure (1)

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17 Terms

1
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In crystallography, crystal structure is a description of the __________ arrangement of atoms in a crystalline material.
ordered
2
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Strontium titanate has the chemical formula __________.
SrTiO3
3
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An __________ is an atom or molecule that has a non-zero net electrical charge.
ion
4
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A __________ is a positively charged ion.
cation
5
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A __________ solid is a material whose constituents are arranged in a highly ordered microscopic structure.
crystalline
6
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The smallest group of particles that constitutes the repeating pattern in a material is called the __________ cell.
unit
7
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The unit cell defines the __________ and structure of the entire crystal lattice.
symmetry
8
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The coordination number refers to the number of __________ with which each atom is in direct contact.
atoms
9
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Packing efficiency in a crystal is defined as the percentage of the __________ occupied by the spheres.
volume
10
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The simple cubic unit cell contains __________ atom(s) at each of its corners.
one
11
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In a body-centered cubic unit cell, there is one atom at the __________ and one at each corner.
center
12
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The packing efficiency for a body-centered cubic structure is __________% .
68
13
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In the face-centered cubic unit cell, atoms touch along the __________ face.
diagonal
14
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A crystal can be classified into __________ Crystal Systems based on its symmetry and structure.
six
15
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The __________ is the only object in the geometrical universe with perfect symmetry.
sphere
16
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Bravais lattices describe the orderly arrangement of atoms in a __________.
crystal
17
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The Weiss indices provide an approximation of a __________ orientation with respect to the crystallographic axes.
face