Glass formation and crystallization in systems ZrF4–BaF2–NaPO3–SnF2(PbF2)–ErF3
Keywords:
fluorozirconate-phosphate glasses, tin difluoride, lead difluoride, DTA, crystallizationAbstract
Glass formation and crystallization in systems ZrF4–BaF2–NaPO3–SnF2(PbF2)–ErF3. *I.G. MASLENNIKOVA1, V.K. GONCHARUK1,2 (1Institute of Chemistry, FEB RAS, Vladivostok, 2Pacific S.O. Makarov Higher Naval School, Vladivostok). *E-mail: masl@ich.dvo.ru
The methods of differential thermal analysis (DTA), X-ray phase analysis (XRD) and transmission electron microscopy (TEM) were used to study glass formation and crystallization in 55ZrF4–(34,5 – x)BaF2–xSnF2(PbF2)–10NaPO3–0,5ErF3 (x = 0–20 mol.%). It was found that the introduction of tin and lead difluorides lowers the glass transition temperature and crystallization onset, while increasing the thermal stability of the systems (ΔТ). Heat treatment at temperatures in the region of the onset of crystallization shows resistance to crystallization of lead-containing glasses. The microstructure of the samples before and after heat treatment consists of nanosized particles whose shape is close to spherical. When selecting conditions, samples can be precursors for producing glass ceramics.