Synthesis and characterization of a simpler Mn-free, Fe-rich M3-type murataite

Maki, Ryosuke; Morgan, Peter E. D.; Suzuki, Yoshikazu

doi:10.1016/j.jallcom.2016.12.142

Cited by 5 publications

(1 citation statement)

References 16 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In this regard, the murataite-pyrochlore titanate ceramics attract considerable attention due to their ability to immobilize radioactive wastes with different and complex chemical compositions, including actinides such as Pu-238. Over last few years, there has been a renewed interest in their synthesis and investigations (Maki et al 2017;Lizin et al 2018, etc. ).…”

Section: Introductionmentioning

confidence: 99%

Murataite-Pyrochlore Ceramics as Complex Matrices for Radioactive Waste Immobilization: Structural and Microstructural Mechanisms of Crystallization

Krivovichev

Yudintsev

Pakhomova

et al. 2019

Springer Proceedings in Earth and Environmental Sciences

View full text Add to dashboard Cite

Murataite-pyrochlore titanate ceramics are attractive waste forms capable to immobilize radioactive waste streams of complex compositions, thus eliminating the need for further chemical separation. We have investigated structures of three types of murataite: 3C, -5C, and -8C phases and demonstrate their polysomatic nature and structural complexity. Structurally simple pyrochlore crystallizes first, followed by crystallization of murataite-5C containing pyrochlore cells surrounded by fragments of Keggin clusters. This phase is overgrown by murataite-8C containing both murataite and pyrochlore cells. The crystallization finishes with the formation of murataite-3C, which is the most stable and less actinide-rich. The microstructure formed via this mechanism reminds a Russian doll, which creates additional barrier for the actinide leaching from the pyrochlore core. The high chemical and structural complexity of the pyrochlore-murataite series is unparalleled in the world of crystalline materials proposed for the HLRW immobilization, which makes it unique and promising for further exploration.

show abstract

Section: Introductionmentioning

confidence: 99%