DOIAbstract
Elastic properties of lead phosphomolybdate [PbO-1bMoO<SUB>3</SUB>-1bP<SUB>2</SUB>O<SUB>5</SUB>] glasses have been investigated using ultrasonic velocity measurements at 10MHz. The composition dependence of elastic moduli, Poisson's ratio and the Debye temperature are found to be consistent with a structural model proposed earlier. According to this model lead acts both as a network former and as a network modifier in different composition regimes. It is suggested that the incorporation of lead into the network is accompanied by the conversion of three-connected [POO<SUB>3/2</SUB>] tetrahedra into four-connected [PO<SUB>4/2</SUB>]<SUP>+</SUP> tetrahedra in the network
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