Abstract
The extended Hubbard Hamiltonian on a bcc lattice is studied at half-filling and for finite hopping between next-nearest-neighbours, in the mean-field approximation. An ionic insulating broken-symmetry phase is predicted to occur for any hydrogenoid bcc solid in the density range 1.0<rs<2.6. The occurrence of an ionic phase would explain the failure to achieve hydrogen metallization at high pressures. Moreover, a metal-insulator transition is expected for sodium in the region of 100 GPa.
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