In the calculation of the structural properties by using a computer. The default structure is used in the calculation of the State structure, might not be ground to test whether the structure is the actual ground state, so it is necessary to calculate the force that acts between the ion in the system. If the force acting between the ion is equal to zero. Indicates that the structure is in the ground, but if the force that acts between the ion has a value not equal to zero, it will depend on how the moving ion in the direction of the force structure to return and perform the calculation of raengkratham between the ion that is equal to zero. This method, which is called a "loosening the structure (structure Relax)." Strength to the position of the atoms at the ion I can write.
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