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SrNp(PO4)2: an original ordered modification of cheralite
Karin Popa1, Gilles Wallez, Philippe E Raison
1Department of Chemistry, Al. I. Cuza University, 11 Carol I Boulevard, 700506 Iasi, Romania.
Inorganic Chemistry
|July 9, 2010
Summary
A new strontium neptunium phosphate compound, SrNp(PO(4))(2), was synthesized and structurally characterized. Its ordered layered structure differs from cheralite, offering insights into cation size effects in actinide phosphates.
Area of Science:
- Solid-state chemistry
- Inorganic materials science
- Crystallography
Background:
- Cheralite (CaTh(PO(4))(2)) is a known mineral structure type.
- Actinide phosphates are important in nuclear waste management and materials science.
- Understanding cation ordering in these compounds is crucial for predicting their stability and properties.
Purpose of the Study:
- To synthesize and characterize a new strontium neptunium phosphate compound.
- To elucidate the crystal structure of SrNp(PO(4))(2) and compare it with related structures.
- To investigate the influence of cation size on the structural arrangement in actinide phosphates.
Main Methods:
- Solid-state reaction synthesis.
- Ab initio and Rietveld refinement for crystal structure determination.
- Raman and Infrared (IR) spectroscopy for cation ordering analysis.
Main Results:
- The new compound SrNp(PO(4))(2) was successfully synthesized in an orthorhombic Cmca structure.
- SrNp(PO(4))(2) exhibits a novel layered structure with alternating SrO(10) and NpO(8) polyhedra, distinct from the disordered structure of cheralite.
- Spectroscopic data confirmed the ordered arrangement of cations within the crystal lattice.
Conclusions:
- The discovered ordered layered structure in SrNp(PO(4))(2) provides a new structural archetype for actinide-bearing phosphates.
- This finding helps explain the limits of the cheralite structure based on cation size.
- The study contributes to the understanding of structural diversity and cation ordering in complex inorganic phosphate materials.
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