Lead molybdate crystals have recently gained increasingly attracting interest as possible acousto-optical materials, modulators, ion conductors, scintillators in nuclear instruments, etc. Glasses and glass-crystalline materials in the system MoO 3-PbO-B 2 O 3 are synthesized by melt quenching. The MoO 3 content varies from 2mol% to 20mol%. The aim of the investigation is to study the structural evolution in the obtained materials using transmission electron microscopy (TEM), and also to trace

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... e appearance and to identify the crystalline phase by X-ray diffraction (XRD) analysis. Typical diffraction patterns of glass-crystalline and crystalline samples are obtained for the glass-ceramics containing more than 9mol% MoO 3. The direct TEM observations show that all samples contain nanocrystals. It is established that the density of the samples is not strongly influenced by the increased MoO 3 content and its values vary between 6.1g/cm 3-for glassy samples and 6.6g/cm 3-for crystalline samples.