Electronic structure and X-photon absorption ability of BaPbO₃

BaPbO₃ powder was fabricated with solid inorganic reaction at low temperature of 800°C and low Pb/Ba mole ratio of 1:1. Cubic perovskite structure of BaPbO₃ was determined with XRD (X-ray Diffraction), which possessed 0.427-0.428nm of lattice parameter. The X-photon absorption ability of BaPbO₃ powder was investigated at 75kV. A kind of composite absorption material, which consists of BaPbO₃ with different mass contents and a kind of adhesion polymer, was prepared. The absorption rate and the Lead Equivalence of one kind of absorbing materials which contains 60% (wt) of BaPbO₃ powder and with a thickness of 0.64mm, is 86.82% and 1.3845 respectively. But for another absorbing material with a thickness of 0.68mm, which consists of equivalence un-reacted source materials PbO and BaCO₃, the rate of absorption and the Lead Equivalence is only 44.43% and 0.3748 respectively. The difference might result from the overlap of extra-nuclear electron cloud and the extend of extra-nuclear valence electron in multi-valence orbitals of absorption atom in BaPbO ₃ material. The molecular orbital and the overlap population of the octahedron configuration center occupied by Pb atom were studied by EHMO (Extended Hukel Molecular Orbital). It is the contribution of electron-cloud expansion that makes up for the decline of absorption ability as material density decreasing. The relationship between X-photon absorption ability and the electrical structure of BaPbO₃ material was primary theoretically analyzed.