Study of barytocalcite as a conditioning matrix for carbon 14: Comparison of several synthesis routes

Experimental and Theoretical Insights into the Bioinspired Formation of Disordered Ba‐Calcite

“…This disordered phase belongs to the space group and differs crystallographically from calcite ( space group). The disordered Ba‐calcite phase was previously identified at high temperatures, and previously synthesized but incorrectly indexed as barytocalcite . Whittaker et al, the first to report the formation at ambient conditions of the disordered Ba‐calcite phase, named this phase balcite.…”

The use of barytocalcite for carbon 14 immobilization: One-year leaching behavior

“…immediately, but local saturation did not occur for CaCO 3 . The dissolution of NaNO 2 as an impurity [2] might worsen this first reprecipitation. From 3.5 h to 24 h, a progressive decohesion of the agglomerates was noted.…”

“…Recently, a double barytocalcite carbonate, BaCa(CO 3 ) 2 , was proposed as a potentially interesting material for C-14 immobilization [2,3]. This phase combines potentially useful features such as a low specific volume of carbon, relatively good sinterability [4] and high compatibility with the established C-14 trapping and stabilization processes [5].…”

A new BaCa(CO3)2polymorph

“…Double carbonates with the composition M1M2(CO 3 ) 2 (M = Ca, Mg, Mn, Zn, Ba, Sr) are an interesting group of materials, where, for example, dolomite [CaMg(CO 3 ) 2 ] has attracted attention as it is a geologically relevant model system in which to study cation order-disorder processes (Vinograd et al, 2009;Burton & Van de Walle, 2003). The double carbonate BaCa(CO 3 ) 2 has recently been investigated with respect to its suitability for the immobilisation of radioactive isotopes (Grandjean & Leturcq, 2005;Massoni et al, 2013Massoni et al, , 2014Massoni et al, , 2015Massoni & Le Gallet, 2016), where the incorporation of 14 C was explored as an alternative to the incorporation of 14 C in CaCO 3 (Brooks et al, 1974;Croff, 1976).…”

“…Later, the subsolidus phase relations in the BaCO 3 -CaCO 3 system have been studied as a function of composition, temperature and pressure (Chang, 1965(Chang, , 1971Brice & Chang, 1973), but no detailed crystallographic analyses have been carried out. Grandjean & Leturcq (2005) and Massoni et al (2013) described the synthesis of barytocalcite powder by precipitation and by mechanosynthesis. Their aim was to study the suitability of barytocalcite as a conditioning matrix for 14 C (Grandjean & Leturcq, 2005).…”