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HCP and CCP are two forms of crystal structures. The repeating structure of CCP has 3 layers of spheres.

The repeating structure of HCP has 2 layers of spheres. In CCP crystal systems, the second layer of spheres is placed on to half of the depressions of the first layer and the third layer is completely different from that of the first two layers the third layer is stacked in the depressions of the second layer. In HCP crystal systems, the third layer of spheres has the same arrangement of spheres as in the first layer, hence spheres of the second layer cover the tetrahedral holes of the first layer and the third layer. The term CCP stands for cubic closest packed crystal systems.Ī subordinate clause starts with a subordinate conjunction or a relative pronoun. The term HCP stands for hexagonal closest packed crystal systems. Then the spheres of the second layer cover the tetrahedral holes of the first layer and the third layer. In hexagonal closest packed crystal systems, the third layer of spheres has the same arrangement of spheres as in the first layer. Side by Side Comparison – HCP vs CCP in Tabular Form The key difference between HCP and CCP is that the repeating structure of HCP has 2 layers of spheres whereas the repeating structure of CCP has 3 layers of spheres. There are few types of close packed crystal structures such as HCP ( Hexagonal closest packed) and CCP ( Cubic closest packed). But if the second layer is placed uncovering the trigonal hole, then it creates an octahedral hole.

If the second layer is placed in such a way that a triangular hole is covered by this second layer spheres, it creates a tetrahedral hole. There are several layers of spheres present on top of one layer. A hole exists between three equal spheres is known as a trigonal hole because it appears as a triangle. There are several types of holes that can exist in between spheres. Close packing of equal spheres will form a dense crystal system with minimum empty spaces or holes between these spheres. That is because an atom is considered as a spherical structure for the ease of describing a crystal system. In crystal systems, an atom is known as a “sphere”. It describes crystal systems having tightly packed atoms. The term “close packed structure” is used regarding the lattices or crystal systems.