Podcast
Questions and Answers
How are particular points within a unit cell, crystallographic directions, or crystallographic planes of atoms specified?
How are particular points within a unit cell, crystallographic directions, or crystallographic planes of atoms specified?
- Using a single number or index to designate point locations
- Using two numbers or indices to designate point locations and directions
- Using three numbers or indices to designate point locations, directions, and planes (correct)
- Using a combination of letters and numbers to designate point locations and directions
What is the basis for determining index values for point locations, directions, and planes?
What is the basis for determining index values for point locations, directions, and planes?
- The unit cell edge lengths
- The position of the point within the unit cell
- The crystal lattice structure
- The unit cell with a right-handed coordinate system (correct)
How can the position of any point located within a unit cell be specified?
How can the position of any point located within a unit cell be specified?
- In terms of its coordinates as fractional multiples of the unit cell edge lengths (i.e., in terms of a, b, and c) (correct)
- In terms of its coordinates using polar coordinates
- In terms of its coordinates as whole numbers
- In terms of its coordinates using spherical coordinates
What does the right-handed coordinate system used for determining index values consist of?
What does the right-handed coordinate system used for determining index values consist of?
In what terms can the position of a point within a unit cell be specified?
In what terms can the position of a point within a unit cell be specified?
Study Notes
Specifying Points, Directions, and Planes in a Unit Cell
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Point positions, crystallographic directions, and crystallographic planes within a unit cell are specified using a coordinate system.
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Index values for point locations, directions, and planes are determined using a right-handed coordinate system.
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The position of any point within a unit cell is specified in terms of its fractional coordinates relative to the unit cell dimensions (x, y, z). Each coordinate value ranges from 0 to 1.
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The right-handed coordinate system consists of three axes (x, y, z) that intersect at the origin (0,0,0) of the unit cell. The axes are mutually perpendicular.
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Point positions within a unit cell are described by coordinates expressed as fractions of the unit cell edge lengths along each of the three axes.
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Description
Test your understanding of crystal points, crystal directions, and crystalline defects with this quiz. Explore the labeling conventions for specifying points within a unit cell, crystallographic directions, and planes of atoms. Sharpen your knowledge of crystalline materials with this insightful quiz.
