Are Pb - Bi ordering waves instrumental for the metal-insulator transition in BaPb sub (1-x) Bi sub x O sub 3 ?

We propose that the metal-semiconductor transition in the BaPb sub (1-x) Bi sub x O sub 3 alloy system is caused by a cooperative effect of both 'breathing-type' charge density waves and ordering waves on the Pb-Bi lattice. The wavevectors Q are nesting vectors over the proper Fermi surfaces and should increase with Bi concentration x. They should be observable in the diffuse elastic scattering.