Separation of neptunium from urine by coprecipitation with BiPO4

Hölgye, Z.

doi:10.1007/bf02386443

Cited by 27 publications

(14 citation statements)

References 7 publications

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“…Upon pressure release a mixture of phase II and IV is recovered at 0.1 GPa. 9 We will summarize now the results obtained in the other experimental runs.…”

Section: A High-pressure X-ray Diffractionmentioning

confidence: 88%

Exploring the high-pressure behavior of the three known polymorphs of BiPO4: Discovery of a new polymorph

Errandonea

Gomis

Santamarı́a-Pérez

et al. 2015

Journal of Applied Physics

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We have studied the structural behavior of bismuth phosphate under compression. We performed x-ray powder diffraction measurements up to 31.5 GPa and ab initio calculations. Experiments were carried out on different polymorphs: trigonal (phase I) and monoclinic (phases II and III). Phases I and III, at low pressure (P < 0.2 -0.8 GPa), transform into phase II, which has a monazite-type structure. At room temperature, this polymorph is stable up to 31.5 GPa. Calculations support these findings and predict the occurrence of an additional transition from the monoclinic monazite-type to a tetragonal scheelite-type structure (phase IV). This transition was experimentally found after the simultaneous application of pressure (28 GPa) and temperature (1500 K), suggesting that at room temperature the transition might by hindered by kinetic barriers.Calculations also predict an additional phase transition at 52 GPa, which exceeds the 2 maximum pressure achieved in the experiments. This transition is from phase IV to an orthorhombic barite-type structure (phase V). We also studied the axial and bulk compressibility of BiPO 4 . Room-temperature pressure-volume equations of state are reported. BiPO 4 was found to be more compressible than isomorphic rare-earth phosphates. The discovered phase IV was determined to be the less compressible polymorph of BiPO 4 . On the other hand, the theoretically predicted phase V has a bulk modulus comparable with that of monazite-type BiPO 4 . Finally, the isothermal compressibility tensor for the monazite-type structure is reported at 2.4 GPa showing that the direction of maximum compressibility is in the (0 1 0) plane at approximately 15º (21º) to the a axis for the case of our experimental (theoretical) study.

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“…Upon pressure release a mixture of phase II and IV is recovered at 0.1 GPa. 9 We will summarize now the results obtained in the other experimental runs.…”

Section: A High-pressure X-ray Diffractionmentioning

confidence: 88%

Exploring the high-pressure behavior of the three known polymorphs of BiPO4: Discovery of a new polymorph

Errandonea

Gomis

Santamarı́a-Pérez

et al. 2015

Journal of Applied Physics

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“…Bismuth phosphate is a technologically important inorganic phosphate and finds application as catalysts, material for the separation of radioactive ions, ion sensors etc. [1][2][3][4][5][6][7][8][9] It exists mainly in two crystalline modifications, namely the hexagonal and monoclinic forms. 10 The hexagonal form is generally associated with water of hydration.…”

Section: Introductionmentioning

confidence: 99%

BiPO4: A better host for doping lanthanide ions

et al. 2012

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In the present manuscript it is demonstrated that BiPO(4) is a better alternative to lanthanide phosphate host for making lanthanide ion-based luminescent materials. Hexagonal and monoclinic forms of BiPO(4) phase were prepared based on the reaction of Bi(3+) and PO(4)(3-) ions in ethylene glycol medium at 100 and 185 °C, respectively. From the differential thermal analysis (DTA) studies it is confirmed that the difference in the nucleation mechanism rather than the phase transition is responsible for the monoclinic phase formation at low temperatures (125 °C). Monoclinic BiPO(4) is quite stable and forms random solid solutions with lanthanide phosphates having both monoclinic (monazite) and tetragonal (xenotime) structures, as confirmed by XRD, FTIR and (31)P solid state nuclear magnetic resonance studies. On excitation corresponding to the (1)S(0)→(3)P(1) transition of Bi(3+) in BiPO(4):Ln samples, energy transfer from host to lanthanide ions takes place. The studies are quite relevant as there is a growing interest all over the world in replacing lanthanide based host used for different applications with easily available, easily purifiable and cheap main group elements (like Sb, Bi etc.) based hosts.

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“…[37][38][39] Nevertheless, obtaining large quantities of rare earth materials in a highly pure form requires much higher cost compared to the main group elements like bismuth, which can be easily purified in large quantities by techniques like zone refining. 40 On account of these reasons, we consider that BiPO 4 which is widely used in catalysis, 41,42 ion sensing 43 and radioactive ions separation 44 may also be a low-cost, non-toxic, high-efficiency and stable host matrix for lanthanide doping UC materials. To the best of our knowledge, there are several reports in which lanthanide ions including Eu 3+ , Tb 3+ and Dy 3+ can be doped into BiPO 4 for down-conversion luminescence 40,[45][46][47][48][49][50] but still no report on Ho 3+ , Er 3+ , Tm 3+ and Yb 3+ doped BiPO 4 for UC luminescence.…”

Section: Introductionmentioning

confidence: 99%

Multicolor and bright white upconversion luminescence from rice-shaped lanthanide doped BiPO4 submicron particles

et al. 2013

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In this paper, uniform rice-shaped lanthanide doped BiPO4 upconversion submicron particles have been successfully synthesized via a facile room-temperature co-precipitation reaction and subsequent calcination route. The morphology, phase transformation and upconversion luminescent properties of synthesized submicron particles (SMPs) were characterized by using different analytical techniques such as scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), thermogravimetry-differential scanning calorimetry (TG-DSC) and upconversion luminescence (UCL) spectra. The transformation from hexagonal phase to monoclinic phase is crucial for upconversion luminescent properties due to the loss of water molecules in the lattice of hexagonal phase. With different variety and concentration of the dopant Ln(3+) (Ln = Yb, Er, Tm and Ho) ions, the obtained samples present bright green, blue, and red upconversion emissions under a 980 nm continual wave laser diode excitation. Multicolor and bright white upconversion emissions have also been obtained by precisely adjusting the dopants concentration in the host lattice.

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Separation of neptunium from urine by coprecipitation with BiPO4

Abstract: The conditions of separation of Np (IV) from mineralised urine by coprecipitation with BiPO 4 were studied. The results indicate that by coprecipitation Np(IV) can be separated with high yield from different volumes of urine.

Cited by 27 publications

References 7 publications

Exploring the high-pressure behavior of the three known polymorphs of BiPO4: Discovery of a new polymorph

Exploring the high-pressure behavior of the three known polymorphs of BiPO4: Discovery of a new polymorph

BiPO4: A better host for doping lanthanide ions

Multicolor and bright white upconversion luminescence from rice-shaped lanthanide doped BiPO4 submicron particles

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