![]() Hexagonal - Hexagonal system shows one type of Bravais lattice which is Primitive. Orthorhombic - Orthorhombic system shows four types of Bravais lattices - Primitive, body centered, base centered and face centered. Tetragonal - Tetragonal system shows two types of Bravais lattices - Primitive, body centered. Equivalent lattices have been already excluded which we got after combining lattice systems and centering types.Ĭubic - Cubic system shows three types of Bravais lattices - Primitive, base centered and face centered. Lattice points of the crystal are joined by straight lines.īy joining the lattice point of the crystal, we get the geometrical shape of the crystal.Įach one of the 14 Bravais lattices possesses unique geometry. This constituent particle of the crystal can be an atom, ion, or molecule. After combining them, several lattices we get are equivalent to each other.Īll 14 Bravais Lattices show few similar characteristics which are listed below-Įach lattice point represents one particle of the crystal. Not all combinations of lattice systems and centering types give rise to new possible lattices. Thus, it has particles at the corners and one particle at the center of each opposite face. Thus, it has particles at the corners and center of each face.īase Centered (C) - In this lattice points are found on the cell corners with one additional lattice point at the center of each face of one pair of parallel faces of the cell. Thus, it has particles at the corners and center of the body or cell.įace Centered (F) - In this lattice points are found on the cell corners with one additional lattice point at the center of each face of the cell. These can be divided into the following types -īody-Centered (I) - In this lattice points are found on the cell corners with one additional lattice point at the center of the cell. Non - Primitive Unit Cells - In these unit cells particles are found in other positions of the lattices as well with corners. Thus, a primitive cell has only one lattice point. In these constituent particles are found at the corners of the lattice in the unit cell, no particles are located at any other position in the cell. It is also sometimes called a simple unit cell. Primitive Unit Cell (P) - In this lattice points are found on the cell corners only. 14 Bravais lattices can be divided into 7 lattice systems -Ĭentering types identify the locations of the lattice points in the unit cell. These 14 Bravais lattices are obtained by combining lattice systems with centering types.Ī Lattice system is a class of lattices with the same set of lattice point groups, which are subgroups of the arithmetic crystal classes. In three-dimensional space, 14 Bravais lattices are there into which constituent particles of the crystal can be arranged. His work including Bravais laws is an important breakthrough in the field of crystallography.īravais lattices are possible both in two-dimensional and three-dimensional spaces where the lattices are filled without any gaps. Bravais lattice actually denotes all the 14 types of three-dimensional patterns in which the atoms can arrange themselves to form a crystal named after the great physicist Auguste Bravais of France. Now when we can understand what is a lattice in a crystal, we can also understand what is braves lattice. Lattice points are the points of finding the constituent atoms of the crystal. The atoms can also be substituted with ions or molecules. The repetitive pattern of the lattice units forms the actual crystal. The definite geometric shapes of crystals are possible due to the formation of a lattice with a series of atoms arranged in that specific pattern to give a well-designed three-dimensional structure. Crystalline solids have definite patterns which arise due to the definite patterns in which the different atoms of the crystals are placed. The concept of lattice comes along with the concept of crystals.
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