Jump to main content
Jump to site search
Access to RSC content Close the message box

Continue to access RSC content when you are not at your institution. Follow our step-by-step guide.



Crystallization of BaF2 from Droplets of a Phase Separated Glass-Evidence of Core-Shell Structure by ASAXS

Abstract

Glasses with the mol% compositions 1.88 Na2O·15.04 K2O·7.52 Al2O3·69.56 SiO2·6.00 BaF2 and 1.88 Na2O·15.03 K2O·7.52 Al2O3·69.52 SiO2·6.00 BaF2·0.05 SmF3 were studied using X-ray diffraction, transmission electron microscopy, and anomalous small-angle X-ray scattering. 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 °C or at 600 °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. Anomalous small-angle X-ray scattering (ASAXS) gave evidence of a core shell structure. In agreement with earlier studies, it is assumed that the shell acts as 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 large as in fluoride phosphate glasses.

Back to tab navigation

Article information


Submitted
19 Dec 2019
Accepted
29 Jun 2020
First published
29 Jun 2020

This article is Open Access

CrystEngComm, 2020, Accepted Manuscript
Article type
Paper

Crystallization of BaF2 from Droplets of a Phase Separated Glass-Evidence of Core-Shell Structure by ASAXS

A. Hoell, V. S. Raghuwanshi, C. Bocker, A. Herrmann, C. Rüssel and T. Höche, CrystEngComm, 2020, Accepted Manuscript , DOI: 10.1039/C9CE02003A

This article is licensed under a Creative Commons Attribution 3.0 Unported Licence. Material from this article can be used in other publications provided that the correct acknowledgement is given with the reproduced material.

Reproduced material should be attributed as follows:

  • For reproduction of material from NJC:
    [Original citation] - Published by The Royal Society of Chemistry (RSC) on behalf of the Centre National de la Recherche Scientifique (CNRS) and the RSC.
  • For reproduction of material from PCCP:
    [Original citation] - Published by the PCCP Owner Societies.
  • For reproduction of material from PPS:
    [Original citation] - Published by The Royal Society of Chemistry (RSC) on behalf of the European Society for Photobiology, the European Photochemistry Association, and RSC.
  • For reproduction of material from all other RSC journals:
    [Original citation] - Published by The Royal Society of Chemistry.

Information about reproducing material from RSC articles with different licences is available on our Permission Requests page.


Social activity

Search articles by author

Spotlight

Advertisements