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Lattice constants, total energies, and densities of state of alkali-earth metals Be, Mg, Ca, Sr, Ba and Ra in group IIA with competing crystalline structures were calculated via the Perdew-Burke-Ernzerhof parameterization of generalized gradient approximation with ultra-soft pseudo-potential method (PBE-GGA-USPP) in the density functional theory. The lattice stabilities of Be, Mg, Ca and Sr agree...
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