Synthesis and characterization of hollandite-type material intended for the specific containment of radioactive cesium

Journal Article · Sun Oct 15 00:00:00 EDT 2006 · Journal of Solid State Chemistry

DOI:https://doi.org/10.1016/j.jssc.2006.05.047· OSTI ID:20900863

Leinekugel-le-Cocq, A Y ^[1]; Deniard, P ^[1]; Jobic, S ^[1]; Cerny, R ^[2]; Bart, F ^[3]; Emerich, H ^[4]

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1. Institut des Materiaux Jean Rouxel, Laboratoire de Chimie des Solides, 2 rue de la Houssiniere, BP32229, 44322 Nantes cedex 3 (France)
2. Laboratoire de Cristallographie, 24, quai Ernest-Ansermet, CH-1211 Geneva 4 (Switzerland)
3. CEA Valrho Marcoule, DEN-DTCD-SECM, Laboratoire d'Etude des Materiaux Ceramiques pour le Conditionnement, BP 17171, 30207 Bagnols sur Ceze cedex (France)
4. ESRF-SNBL, 6 rue Jules Horomitz, 38000 Grenoble (France)

The hollandite Ba{sub 1}Cs{sub 0.28}Fe{sub 0.82}Al{sub 1.46}Ti{sub 5.72}O{sub 16}, which has been proposed for the cesium-specific conditioning, can be synthesized either by an alcoxyde or a dry route. In both cases, a two-step protocol is applied, i.e., a calcination at 1000 deg. C followed by a sintering at 1200 deg. C . After sintering, both synthetic processes lead to a tetragonal form. According to the X-ray diffraction (XRD) patterns collected at the barium and the cesium K absorption edges, the different positions of these two elements have been evidenced with a more centered position in the oxygen cubic site of the tunnel for Ba than for Cs. On the contrary, after calcination, the two synthetic routes yield different products. The alcoxyde route gives rise to a mixture of the aforementioned Cs- and Ba-containing tetragonal I4/m hollandite, a Cs-only-containing monoclinic I2/m hollandite and an unidentified phase with a weak coherence length containing only Ba. The dry route yields a single tetragonal hollandite material containing Ba and Cs stly different in composition from the targeted compound. - Graphical abstract: Ba and Cs location along the tunnel axis in BaCs{sub 0.28}Fe{sub 0.82}Al{sub 1.46}Ti{sub 5.72}O{sub 16}.

• OSTI ID: 20900863
• Journal Information: Journal of Solid State Chemistry, Vol. 179, Issue 10; Other Information: DOI: 10.1016/j.jssc.2006.05.047; PII: S0022-4596(06)00338-0; Copyright (c) 2006 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved; Country of input: International Atomic Energy Agency (IAEA); ISSN 0022-4596
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM COMPOUNDS
BARIUM COMPOUNDS
CALCINATION
CESIUM
CESIUM COMPOUNDS
COHERENCE LENGTH
HOLLANDITE
IRON COMPOUNDS
K ABSORPTION
MONOCLINIC LATTICES
OXIDES
RADIOACTIVE WASTES
SINTERING
SYNTHESIS
TEMPERATURE RANGE 1000-4000 K
TETRAGONAL LATTICES
TITANIUM COMPOUNDS
X-RAY DIFFRACTION