In this hexagonal structure, two sides are equal and one side is of a different length. There is only one Bravais Lattice under the hexagonal system: Primitive Hexagonal Cells. Ques: What is the difference between amorphous solids and crystalline solids? (3 Marks)Īns: There are three lattice systems with only one Bravais lattice under them: Hexagonal system, Rhombohedral system, and Triclinic system. An example of end-centered orthorhombic structure is Magnesium sulfate heptahydrate. An example of face-centered orthorhombic structure is barium sulfate. An example of body-centered orthorhombic structure is potassium nitrate. An example of primitive orthorhombic structure is rhombic sulphur. The two possible variations under orthorhombic lattices are: Primitive Orthorhombic Cells, Body-Centered Orthorhombic Cells, Face-Centered Orthorhombic Cells, and End-Centered Orthorhombic Cells. However, the angle between all the faces is the same i.e. In an orthorhombic structure, all the sides are unequal. There are four Bravais Lattices under the orthorhombic system. An example of a body-centered tetragonal structure is titanium dioxide. An example of primitive tetragonal structure is stannic oxide. There are two possible variations of tetragonal lattices: Primitive Tetragonal Cells and Body-Centered tetragonal Cells. In a tetragonal structure, two sides have the same length, and the third side has a different length. Some examples of body-centered cubic structures are iron, beta titanium, and chromium.Įxamples of face-centered cubic structure are nickel, aluminum, copper, and silver.Īns: There are two Bravais Lattices under the tetragonal system. The three possible variations of cubic lattices are:Īn example of primitive cubic structure is Polonium. All sides in cubic lattices are of the same length and the angle between all the faces is 90°. There are three Bravais Lattices under the cubic system. Read More: Classification Of Crystalline Solids There are 14 Bravais Lattices which can be divided into 7 lattice crystal systems. Read Also: Tetrahedral and Octahedral Voids The lattice points are indistinguishable from one another. The lattice points are identical to each other.Ī Bravais lattice is an array of discrete points with an arrangement and orientation that look exactly the same from any of the discrete points. In other words, lattice points are points in a crystal where the possibility of finding a particle is highest. The geometric arrangement of points in a crystal where constituent particles like atoms, ions, or molecules occur is called a lattice. Some examples of amorphous solids are rubber, plastic, wax, and fused silica. They are isotropic in nature.Īmorphous solids can be softened easily and molded into a variety of shapes. Amorphous solids are referred to as super cooled solids or pseudo solids. They follow the short range order in the arrangement of constituent particles. Some examples of crystalline solids are quartz, calcite, and sodium chloride.Īmorphous solids have an irregular shape. Crystalline solids are true solids and they are anisotropic in nature.Ĭrystalline solids have a sharp melting point. They follow the long range order in the arrangement of constituent particles such as atoms, ions, or molecules. This classification is done on the basis of the arrangement of particles in the solid.Ĭrystalline solids have a definite geometrical shape. Solids can be categorized into two types: Amorphous solids and crystalline solids.

14 bravais lattice