Two-Dimensional Uranyl Borates: From Conventional to Extreme Synthetic Conditions: Two-Dimensional Uranyl Borates: From Conventional to Extreme Synthetic Conditions
- Hefei Univ. (China); OSTI
- Forschungszentrum Juelich (Germany). Inst. for Energy and Climate Research (IEK)
- Florida State Univ., Tallahassee, FL (United States)
- Collaborative Innovation Center of Radiation Medicine of Jiangsu Higher Education Institutions, Jiangsu (China)
- Hefei Univ. (China)
A systematic investigation of uranyl borates under different synthetic conditions resulted in five new 2D compounds, namely, (H3O)[(UO2)(BO3)], Li[(UO2)(BO3)]·(H2O), α-K4[(UO2)5(BO3)2O4], β-K4[(UO2)5(BO3)2O4] and K2.5[(UO2)5(BO3)2O2.5(OH)1.5]·(H2O)2.5. (H3O)[(UO2)(BO3)] and Li[(UO2)(BO3)]·(H2O) were obtained from hydrothermal reactions at 220 °C using the same mineralizer. Both materials possess the uranophane sheet topology with different symmetry of the unit cells. In the structure of (H3O)[(UO2)(BO3)] and Li[(UO2)(BO3)]·(H2O), UO7 pentagonal bipyramids share edges and vertexes with four BO3 planar triangles. α-K4[(UO2)5(BO3)2O4] and β-K4[(UO2)5(BO3)2O4] are polytypes. α-K4[(UO2)5(BO3)2O4] was synthesized from a high-temperature solid-state reaction under ambient pressure; whereas β-K4[(UO2)5(BO3)2O4] was obtained from a high-temperature/high-pressure (HT/HP) reaction. Both structures have an identical anion topology, but β-K4[(UO2)5(BO3)2O4] crystallizes in space group with higher symmetry. In K2.5[(UO2)5(BO3)2O2.5(OH)1.5]·(H2O)2.5, which was obtained from a hydrothermal reaction, UO7 polyhedra share vertexes and edges with two independent BO3 triangles, forming the most complex uranyl borate layers among all five compounds. The different synthetic routes, novel topologies, thermal behavior and Raman spectra are discussed.
- Research Organization:
- Energy Frontier Research Centers (EFRC) (United States). Center for Actinide Science & Technology (CAST)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- Grant/Contract Number:
- SC0016568
- OSTI ID:
- 1767535
- Journal Information:
- European Journal of Inorganic Chemistry, Journal Name: European Journal of Inorganic Chemistry Journal Issue: 4 Vol. 2020; ISSN 1434-1948
- Publisher:
- ChemPubSoc EuropeCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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