@Article{dbt_mods_00053441,
  author = 	{Hoell, Armin
		and Raghuwanshi, Vikram Singh
		and Bocker, Christian
		and Herrmann, Andreas
		and R{\"u}ssel, Christian
		and H{\"o}che, Thomas},
  title = 	{Crystallization of BaF2 from droplets of phase separated glass - evidence of a core-shell structure by ASAXS},
  journal = 	{CrystEngComm},
  year = 	{2020},
  month = 	{Jun},
  day = 	{29},
  publisher = 	{RSC},
  address = 	{London},
  volume = 	{22},
  number = 	{30},
  pages = 	{5031--5039},
  keywords = 	{Kristallchemie},
  abstract = 	{Glasses with the mol{\%} compositions 1.88 Na2O{\textperiodcentered}15.04 K2O{\textperiodcentered}7.52 Al2O3{\textperiodcentered}69.56 SiO2{\textperiodcentered}6.00 BaF2 and 1.88 Na2O{\textperiodcentered}15.03 K2O{\textperiodcentered}7.52 Al2O3{\textperiodcentered}69.52 SiO2{\textperiodcentered}6.00 BaF2{\textperiodcentered}0.05 SmF3 were studied using X-ray diffraction, transmission electron microscopy, and anomalous small-angle X-ray scattering (ASAXS). While the glass doped with samarium showed liquid/liquid phase separation of droplets with sizes of around 100 nm, the glass without samarium did not. The samples were annealed at 580 {\textdegree}C or at 600 {\textdegree}C which led to the crystallization of cubic BaF2. The X-ray diffraction patterns showed strongly broadened lines. Hence, the BaF2 crystals possess sizes in the nm range. ASAXS gave evidence of a core shell structure. In agreement with earlier studies, it is assumed that the shell acts as a diffusion barrier that hinders crystal growth. Surprisingly, the cores and shells from the crystallization of the homogeneous glass and from the second glass, which is Sm-doped and shows liquid/liquid phase separation, both possess similar dimensions, even though the origin of the barrier is very different. The doped samples show long luminescence lifetimes of nearly 5 ms at a wavelength of 600 nm, which is nearly as long as those in fluoride phosphate glasses.},
  note = 	{Im Titel ist "2" tiefgestellt},
  note = 	{The Royal Society of Chemistry},
  note = 	{Nachgewiesen 1999 -},
  issn = 	{1466-8033},
  doi = 	{10.1039/C9CE02003A},
  url = 	{https://www.db-thueringen.de/receive/dbt_mods_00053441},
  url = 	{http://uri.gbv.de/document/gvk:ppn:176091228X},
  url = 	{http://uri.gbv.de/document/gvk:ppn:319513033},
  url = 	{https://doi.org/10.1039/C9CE02003A},
  file = 	{:https://www.db-thueringen.de/servlets/MCRFileNodeServlet/dbt_derivate_00057307/1466-8033_22_2020_30_5031-5039.pdf:PDF},
  language = 	{en}
}