Glass Formation in the MoO3-La2O3-Nd2O3 System

Lyubomir Aleksandrov; Reni Iordanova; Yanko B. Dimitriev; Katsumi Handa; Junko Ide; Margarita Milanova

doi:10.4028/www.scientific.net/AMR.39-40.37

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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 39-40Glass Formation in the MoO3-La2O3-Nd2O3 System

Glass Formation in the MoO₃-La₂O₃-Nd₂O₃ System

Abstract:

Novel low melting glasses in the MoO3-La2O3-Nd2O3 system were obtained at different cooling rates (102 K/s and 104-105 K/s). Characterization of the amorphous samples was made by differential thermal analysis (DTA) and X-ray absorption fine structure (XAFS) method. According to DTA data of the glass samples, the glass transition temperatures are at 325-330 0C, the crystallization started above 410 0C and the melting temperatures are at 660-720 0C. A structural model of glasses was suggested on the basis of XAFS and IR investigations. It was shown that the predominant structural units in the amorphous network of glasses containing 90 -80 mol% MoO3 are MoO6 groups. The appearance of MoO4 groups deteriorates the glass formation ability.