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On the crystallochemical origin of the disordered form of Ba7(EuII)F12Cl2 and the structural changes induced at high temperature

Published inKristall und Technik, vol. 41, no. 10, p. 1005-1012
Publication date2006
Abstract

The crystal structure of the disordered modification of Ba7F12Cl2 has been carefully re-examined on several new crystals prepared under different conditions of synthesis. All single crystal structure refinements reveal a residual electron density of 3 e-/Å3 in the 0,0,0 position which is explained by the introduction of a small amount of sodium ions in the crystal. The title compound transforms from a disordered to an ordered modification at 800 °C. New structural data show a change in space group from P63/m to P6. During this process, a slight chemical change and the formation of nano-channels in the crystals is observed by electron microscopy. These changes were further studied by electron microprobe analysis, by spectroscopic methods and thermal analysis.

Keywords
  • Disordered solids
  • Structural changes
  • Luminescence
Research group
Citation (ISO format)
KUBEL, Frank, HAGEMANN, Hans-Rudolf. On the crystallochemical origin of the disordered form of Ba7(EuII)F12Cl2 and the structural changes induced at high temperature. In: Kristall und Technik, 2006, vol. 41, n° 10, p. 1005–1012. doi: 10.1002/crat.200610712
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ISSN of the journal0023-4753
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