The geological disposal of high level radioactive waste requires careful budgeting of the heat load produced by radiogenic decay. Removal of high-heat generating radionuclides, such as ¹³⁷Cs, reduces the heat load in the repository allowing the remaining high level waste to be packed closer together therefore reducing demand for repository space and the cost of the disposal of the remaining wastes. Hollandites have been proposed as a possible host matrix for the long-term disposal of Cs separated from HLW raffinate. The incorporation of Cs into the hollandite phase is aided by substitution of cations on the B-site of the hollandite structure, including iron. A range of Cs containing iron hollandites were synthesised via an alkoxide-nitrate route and the structural environment of Fe in the resultant material characterised by Mössbauer and X-ray Absorption Near Edge Spectroscopy. The results of spectroscopic analysis found that Fe was present as octahedrally co-ordinated Fe (III) in all cases and acts as an effective charge compensator over a wide solid solution range.

高放废物的地质处置需要对放射性衰变产生的热负荷进行仔细的预算。去除高热放射性核素，例如¹³⁷Cs降低了储存库中的热负荷，从而使剩余的高放废物可以更紧密地包装在一起，因此减少了对储存库空间的需求以及处置剩余废物的成本。有人建议将荷兰人作为长期处置从高放废物残液中分离出的铯的一种可能的基质。将Cs掺入到堇青石相中，是通过置换包括铁在内的沸石结构B位上的阳离子来实现的。通过醇盐-硝酸盐路线和Fe的结构环境，通过Mössbauer和X射线吸收近边缘光谱法表征了一系列含Cs的铁锂铁矿。