Browsing by Author "Gancheva M."

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    Synthesis of amorphous and crystalline LaBWO6 using mechanochemical activation
    (2015-01-01) Gancheva M.; Aleksandrov L.; Iordanova R.; Dimitriev Y.
    This article presents data referring to the mechanochemical activated synthesis of amorphous and crystalline LaBWO6. A stoichiometric mixture of La2O3, B2O3 and WO3 of a 1:1:2 molar ratio was subjected to intense mechanical treatment in air using a planetary ball mill (Fritsch - Premium line - Pulversette No. 7). The obtained samples were analyzed by XRD, DTA, IR and UV-Vis spectroscopy. The process of mechanochemical amorphization was accomplished within 20 h at a milling speed of 500 rpm at room temperature. An additional heat-treatment of the mechanochemically obtained amorphous phase was carried out in order to obtain single crystal LaBWO6 phase. The short range order of the amorphous network was defined by BO3, BO4 and WO4 structural units. Glassy LaBWO6 was obtained by us with the application of the melt quenching method prior to these experiments. The infrared and optical spectra showed that WO4 units were more distorted in the structure of the glassy LaBWO6 when compared to those of both amorphous phases. The crystallization of LaBWO6 was achieved after thermal treatment at 690°C of the mechanochemically obtained amorphous and glass composition.