P A MICROSTRUCTURAL EVOLUTION IN GLASS-CRYSTALLINE MATERIALS CONTAINING LEAD MOLYBDATE CRYSTALS release_uixtimhu5zetjgoofpgteejdbq

Abstract

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 the 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.
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