Synthesis and characterization of crystalline phosphates of plutonium(III) and plutonium(IV)

Bamberger, C.E.; Haire, R.G.; Hellwege, H.E.; Begun, G. M.

doi:10.1016/0022-5088(84)90040-7

Cited by 36 publications

(31 citation statements)

References 13 publications

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“…As instance, the preparation of PuPO 4 was mentioned using wet chemistry methods, mostly involving the initial precipitation of rhabdophane as starting precursors, 142 or solid state syntheses. 140,143 Ponderable amounts of monazite were also obtained for americium, 144,145 248 Cm curium 146 as well as for 249 Bk berkelium, 249 Cf cal- Table 1 Unit-cell parameters of the M III PO 4 monazite-type compounds. 146 ifornium and 251 Es einsteinium.…”

Section: III Po 4 Compoundsmentioning

confidence: 99%

Crystal chemistry of the monazite structure

Clavier

Podor

Dacheux

2011

Journal of the European Ceramic Society

343

243

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Section: III Po 4 Compoundsmentioning

confidence: 99%

Crystal chemistry of the monazite structure

Clavier

Podor

Dacheux

2011

Journal of the European Ceramic Society

343

243

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“…monazites) where Pu(IV) is thermally reduced to Pu(III) at high temperatures. 77 The oxidation of Pu(III) to Pu(IV) can be very rapid at elevated temperatures. When Pu(III) is reacted with molten boric acid at 200 1C or higher it rapidly oxidizes to Pu(IV) and Pu(VI).…”

Section: Plutonium(iii) Boratesmentioning

confidence: 99%

Recent progress in actinide borate chemistry

et al. 2011

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The use of molten boric acid as a reactive flux for synthesizing actinide borates has been developed in the past two years providing access to a remarkable array of exotic materials with both unusual structures and unprecedented properties.[ThB 5 O 6 (OH) 6 ][BO(OH) 2 ]Á2.5H 2 O possesses a cationic supertetrahedral structure and displays remarkable anion exchange properties with high selectivity for TcO 4 À . Uranyl borates form noncentrosymmetric structures with extraordinarily rich topological relationships. Neptunium borates are often mixed-valent and yield rare examples of compounds with one metal in three different oxidation states. Plutonium borates display new coordination chemistry for trivalent actinides. Finally, americium borates show a dramatic departure from plutonium borates, and there are scant examples of families of actinides compounds that extend past plutonium to examine the bonding of later actinides. There are several grand challenges that this work addresses. The foremost of these challenges is the development of structure-property relationships in transuranium materials. A deep understanding of the materials chemistry of actinides will likely lead to the development of advanced waste forms for radionuclides present in nuclear waste that prevent their transport in the environment. This work may have also uncovered the solubility-limiting phases of actinides in some repositories, and allows for measurements on the stability of these materials.

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“…XRD was carried out on PuPO 4 using a Siemens D500 diffractometer with an integration time of 38 h. A single phase was observed and, as expected, the final compound belongs to the monoclinic monazite phase (P2 1 /n space group). The lattice parameters have been compared with those reported by Bjorklund [11] and Bamberger et al [5] and are compiled in Table 1.…”

Section: Methodsmentioning

confidence: 99%

“…The dark green precipitate was washed with water several times and next dried at 353 K and 403 K in air for 2 h each. [5,10]. For both these treatments a molybdenum crucible was used.…”

Section: Methodsmentioning

confidence: 99%

“…This compound was prepared successfully from plutonium nitrate precursor by coprecipitation as presented in the first section of this paper. An intermediary compound PuP 2 O 7 is formed, and its thermal reduction leads to the final compound PuPO 4 , as demonstrated by Bamberger et al [5]. The heat capacity of PuPO 4 has been measured between 5 K and 300 K by a hybrid adiabatic relaxation calorimeter.…”

Section: Introductionmentioning

confidence: 95%

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