The ESR spectra of Cr doped PbMoO, originate from CrOi-ions at normal MovI sites with a dZz ground state interacting with z07Pb nuclei of two sets of four first-neighbour lead sites. The principal values and the directions of the principal axes of the two Cr5+-Pb2+ hf tensors are determined and discussed according t o the nature of the cation-cation interactions. The temperature dependence of the spectrum intensity, which falls to zero outside the 10 to 45 K region is explained as a combination of a very short Cr5+ spin lattice relaxation time and a long spin diffusion time. The yellow coloration of oxidized samples of PbMoO, (Cr) results from the existence of an intense line (f = 0.14)in its absorption spectrum peaking a t 430 nm. This band is attributed to a charge transfer transition of Ci-0;-ions which is red shifted from its normal position in most chromates because of a mixing with a Pb2+ -Cr6+ intervalence transition.Le spectre R P E de PbMoO, dope au chrome a 6tk attribue B un ion C r O r en site MovI possbdant un &at fondamental de type dzz en interaction avec les noyaux c07Pb des deux groupes de plomb premiers-voisins. Les valeurs principales e t les directions principales des deux tenseurs hyperfins Cr5+-Pb2+ ont At& dkterminkes et discutees en fonction de la nature des interactions cation-cation.
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