ECEMAS: The Structure of Crystalline Solids - Part 2

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How many different possible combinations of a, b, c, α, β, and γ represent distinct crystal systems?

7

Which crystal system has the greatest degree of symmetry?

Cubic

Which crystal system has the least symmetry?

Triclinic

Which crystal structures belong to the cubic crystal system?

<p>FCC and BCC</p> Signup and view all the answers

Which crystal system does the HCP structure fall within?

<p>Hexagonal</p> Signup and view all the answers

What is the term used to describe the phenomenon where a material can have more than one crystal structure?

<p>Polymorphism</p> Signup and view all the answers

How are the coordinates of a point within a unit cell specified?

<p>In terms of fractional multiples of the unit cell edge lengths (a, b, and c)</p> Signup and view all the answers

Which of the following statements about carbon is true?

<p>Diamond is formed at extremely high pressures.</p> Signup and view all the answers

What is the crystal structure of pure iron at room temperature?

<p>Body-centered cubic (BCC)</p> Signup and view all the answers

Which of the following parameters is NOT used to define the unit cell geometry of a crystal structure?

<p>Atomic radii</p> Signup and view all the answers

What is the term used to describe the six parameters that define the unit cell geometry of a crystal structure?

<p>Lattice parameters</p> Signup and view all the answers

In the context of crystal structures, what does the term 'parallelepiped' refer to?

<p>A three-dimensional shape with six parallelogram faces</p> Signup and view all the answers

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