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Synthesis of hafnium germanate (HfGeO4) particles: Impact of crystallization route on X/UV conversion properties

Jérémy Balencie 1 Laurent Levy 2 Jean-François Hochepied 1
1 CEP/Paris
CEP - Centre Énergétique et Procédés
Abstract : The crystallization route - calcination or hydrothermal ripening - of an amorphous hafnium and germanium oxide coprecipitate determines the X/UV conversion properties of the resulting hafnium germanate (HfGeO4). The calcination of the amorphous precipitate leads to micrometric aggregated particles exhibiting strong X/UV conversion whereas its hydrothermal crystallization resulted in well individualized nanoparticles with no X/UV conversion property. To explain these phenomena, the crystalline structure and chemical composition of the final products were investigated with X-ray diffraction (XRD) and inductively coupled plasma-mass spectrometry (ICP-MS). The key result is that germanium is partially solubilized from the amorphous precursor in hydrothermal conditions, resulting in the crystallization of a Ge deficient hafnium germanate possessing no X/UV conversion properties.
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Submitted on : Thursday, February 28, 2013 - 9:12:10 AM
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Jérémy Balencie, Laurent Levy, Jean-François Hochepied. Synthesis of hafnium germanate (HfGeO4) particles: Impact of crystallization route on X/UV conversion properties. Materials Chemistry and Physics, Elsevier, 2008, 112, pp.546-550. ⟨10.1016/j.matchemphys.2008.05.087⟩. ⟨hal-00795386⟩

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