Journal Article

FZJ-2016-04697

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Influence of Synthetic Conditions on Chemistry and Structural Properties of Alkaline Earth Uranyl Borates

Hao, Y.FZJ* ; Klepov, V. V. ; Murphy, G. L. ; Modolo, G.FZJ* ; Bosbach, D.FZJ* ; Albrecht-Schmitt, T. E. ; Kennedy, B. J. ; Wang, S. ; Alekseev, E. (Corresponding author)FZJ*

2016
ACS Publ. Washington, DC

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Please use a persistent id in citations: doi:10.1021/acs.cgd.6b00978

Abstract: Four novel alkaline earth metal uranyl borates, namely, A[(UO2)5(BO3)2O2(OH)2]∙5H2O (SrUBO-1, BaUBO-1) and A[(UO2)2(B2O5)O] (SrUBO-2, BaUBO-2) (A = Sr, Ba), have been prepared. SrUBO-1, BaUBO-1, and BaUBO-2 were synthesized using hydrothermal methods, whereas SrUBO-2 was prepared by a traditional high-temperature solid-state method. The compounds SrUBO-1 and BaUBO-1 were found to be iso-structural and crystallized in the centrosymmetric group C2/c. Their structure features two-dimensional anionic layers {[(UO2)5(BO3)2O2(OH)2]2-}n that are composed of [(UO2)5O2(OH)2]4+ clusters and [BO3]3- polyanions. From a topological point, this two-dimensional anionic layer can be described as a new 4-nodal net topological type with a Schläfli symbol of {35.45}2{36.46.53}3{37.47.57}2. SrUBO-2 and BaUBO-2 are iso-structural and crystallized in space group C2/m. Their structures are based on a three-dimensional {[(UO2)2(B2O5)O]2-}n. Within the three-dimensional framework, two-dimensional U(2)-U(1)=U(3) layers (L1) with cation to cation interactions between [U(3)O2]2+ groups and one-dimensional edge sharing U(1)-U(2) chains are present. The B2O5 dimers corner sharing with U(1)-U2 chains and U(3)O6 tetragonal bipyramids forming two-dimensional layers (L2). L1 further vertically interconnect with L2 through bridging B2O5 dimers, forming a three-dimensional framework [(UO2)2(B2O5)O]2-. The synthetic conditions, structural characterization, thermal stability as well as spectroscopic properties of the alkaline earth metal uranyl borates are reported and discussed.

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Contributing Institute(s):

1. Nukleare Entsorgung und Reaktorsicherheit (IEK-6)

Research Program(s):

1. 161 - Nuclear Waste Management (POF3-161) (POF3-161)
2. Helmholtz Young Investigators Group: Energy (HGF-YIG-Energy) (HGF-YIG-Energy)
3. HITEC - Helmholtz Interdisciplinary Doctoral Training in Energy and Climate Research (HITEC) (HITEC-20170406) (HITEC-20170406)

Appears in the scientific report 2016

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Database coverage:
; Current Contents - Physical, Chemical and Earth Sciences ; Ebsco Academic Search ; IF < 5 ; JCR ; NCBI Molecular Biology Database ; No Authors Fulltext ; SCOPUS ; Science Citation Index ; Science Citation Index Expanded ; Thomson Reuters Master Journal List ; Web of Science Core Collection

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