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Crystal Structure - 3 (Bravais lattice, Symmetry in Crystals) Video Lecture | Solid State Physics, Devices & Electronics
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FAQs on Crystal Structure - 3 (Bravais lattice, Symmetry in Crystals) Video Lecture - Solid State Physics, Devices & Electronics
| 1. What is a Bravais lattice? |  |
Ans. A Bravais lattice is a mathematical concept used to describe the arrangement of atoms or ions in a crystal structure. It defines the periodicity and symmetry of the crystal lattice, representing the repeating pattern of the crystal's basic building blocks.
| 2. How many types of Bravais lattices are there? | |
Ans. There are 14 types of Bravais lattices classified into seven crystal systems: cubic, tetragonal, orthorhombic, rhombohedral, hexagonal, monoclinic, and triclinic. Each crystal system has a unique combination of lattice parameters and symmetry elements.
| 3. What is the role of symmetry in crystals? | |
Ans. Symmetry plays a crucial role in crystals as it helps in understanding and predicting the physical properties of crystals. Symmetry elements such as rotation axes, reflection planes, and inversion centers determine the crystal's overall shape, optical properties, and behavior under external stimuli like heat or pressure.
| 4. What are symmetry operations in crystals? | |
Ans. Symmetry operations in crystals describe the transformations that leave a crystal's overall appearance unchanged. These operations include rotation, reflection, inversion, and translation. By analyzing the symmetry operations, one can determine the crystal's point group, which further helps in characterizing its physical properties.
| 5. How are symmetry planes represented in crystal structures? | |
Ans. Symmetry planes in crystal structures are represented by Miller indices, which are a set of three integers denoted as (hkl). These indices define the orientation and position of the symmetry plane relative to the crystal lattice. For example, the (100) plane is perpendicular to the crystallographic axis, while the (110) plane makes a 45-degree angle with two different crystallographic axes.
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