Defects In Crystals Flashcards
Any deviation from the perfect atomic arrangement in a crystal is said to contain _____
imperfections or defects.
An ideal crystal is a perfect crystal in which each atom has ____
identical surroundings.
An ideal crystal is a perfect crystal in which each atom has ____
identical surroundings.
Real crystals are
not perfect.
Real crystals contain imperfections that are classified according to their:
geometry and shape into
• point,
• line, and
• planar defects.
A real crystal always has
large number of imperfections in the lattice.
The study of imperfections has a
two-fold purpose.
The purpose of studying imperfections of crystals are:
- A better understanding of crystals and how they affect the properties of metals.
The purpose of studying imperfections of crystals are:
- Exploration of possibilities of minimizing or eliminating these defects.
A crystal is
a solid composed of atoms, ions, or molecules arranged in a repetitive 3- D pattern.
In an ideal crystal the atomic arrangement is
perfectly regular and continuous.
In real crystal
there is a lattice distortion and various imperfections, irregularities and defects are present.
A crystal structure is built of
atoms
A crystal lattice is
an infinite pattern of points.
Each pattern of points in a crystal lattice must have
the same surroundings in the same orientation.
