Recent X-Ray Diffraction Studies on the Hydrous Oxides and Hydroxides.

Wo, Milligan

doi:10.1021/j150487a003

Cited by 35 publications

(2 citation statements)

References 13 publications

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“…If the hydroxides are precipitated with F e O hydroxide, however, crystallization is impeded. Such inhibition of crystallization is found for various systems: Co(II)-Fe(III), Ni(II)-Fe(III), Mg(II)-Fe(m), and others (Krause and Rychlewska 1953;Morrow and Levy 1968;Milligan 1951). Inhibition of crystallization also has been observed with other systems: M(III,lY)-Cr(m) (Livage and Monte1 1962), Ni(II)-Al(ITI) (Milligan and Merton 1946), and Cr(llI)-Zr(N) (Milligan and Merten-Watt 1948).…”

Section: O Introductionmentioning

confidence: 90%

Interaction of Pu(IV,VI) hydroxides/oxides with metal hydroxides/oxides in alkaline media

Федосеев¹,

Крот²,

Budantseva³

et al. 1998

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SummaryThe interactions of Pu(N) and Pu(VI) in alkaline media with some metal hydroxides and oxides commonly found in Hanford Site tank wastes were studied. The properties of mixed hydroxide systems of Pu(IV) with various metal ions mi@), Fe(III), C o o , Al(m), Cr(m>, Zr(IV), La(IlI), and U(VI)] were investigated at variable component ratios using physicalchemical methods. The interactions of P u O with Al(lII), Fe(III), and Cr(IlI) also were studied.It was shown by infrared (IR) spectroscopy that, except for the system Pu(IV)-Ni(II), Pu(IV) interacts with all the listed metal ions and affects their interatomic bonding. The locations of IR absorption bands of the mixed hydroxides change irregularly compared with the spectra of pure components, with change in the Pu:metal mole ratio of from 1:lO to 1O:l. The changes occur both for the valent and deformation vibration bands of hydroxyl ions and water at 3600 to 3100 and 1750 to 1250 cm-' and for the vibrations of metal-oxygen (M-0) bridging bonds in the range of 1050 to 850 cm-'. In the Pu(IV)/Ni(II) system, the IR spectra are equivalent to the sum of the individual components precipitated separately from alkaline solution.The separate precipitation of h(N) hydrous oxide and Ni(OH), upon adding NaOH solution to acidic solution containing both Pu(N) and Ni(II) nitrate was confirmed by studying the dissolution rate of the resulting precipitate in 3 M HCl at 60°C. No difference in plutonium dissolution behavior was found for pure PuO,-xH,O and the products obtained by alkaline precipitation of 1: 1 mole ratio Pu(N):Ni(II) mixtures, aged for 1 hour at 70"C, over a wide range of NaOH concentrations. Similar results were obtained for the Pu(IV)-Al(III) system. Only trace amounts of aluminum were detected in pUO,.xl&O precipitates formed even in relatively dilute NaOH solutions.

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Section: O Introductionmentioning

confidence: 90%

Interaction of Pu(IV,VI) hydroxides/oxides with metal hydroxides/oxides in alkaline media

Федосеев¹,

Крот²,

Budantseva³

et al. 1998

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“…The increase of the 06,33 reflection position may indicate increasing [4] Fe 3+ for [4] Si 4 tetrahedral substitutions with increasing pH (Baron et al, 2016a). The additional presence of bayerite (Al(OH) 3 ) can be inferred from the solid produced in pure water, as well as from the solid produced in the solution at pH 12 (although in lower abundance), from the XRD peaks at 4.68, 4.35, 3.18, 2.21, 1.71, and 1.59 Å (Milligan, 1951;Lefevre & Fedoroff, 2002) and the FTIR bands at 3651, 3545, 3461, and 3418 cm -1 (Phambu et al, 2002 -Figs 5, 6). FTIR spectra of all solid residues showed bands typical of nontronite (i.e.…”

Section: Syntheses From the Gels Obtained Using The Alcl 3 Solution A...mentioning

confidence: 99%

Influence of pH on the Hydrothermal Synthesis of Al-Substituted Smectites (Saponite, Beidellite, and Nontronite)

Criouet,

Viennet,

Baron

et al. 2023

Clays and clay miner.

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Smectitic clay minerals are unique indicators of paleoenvironmental conditions and exhibit a unique reactivity in the mineral world. Smectites may exhibit tetrahedral substitutions (Al3+, and sometimes Fe3+, can substitute for Si4+ in tetrahedral sites), resulting in a layer-charge increase, thereby impacting their properties (e.g. swelling and sorption capacities, catalytic properties, expandable abilities). The objective of the present study was to determine the influence of pH conditions on the hydrothermal production of smectite end-members exhibiting tetrahedral Al substitutions (saponite, beidellite, and nontronite), using X-ray diffraction (XRD) and Fourier-transform infrared (FTIR) methods. The results of a series of syntheses conducted at various pH values allowed discussion of the crystallization pathways of these smectites from a mechanistic point of view. Altogether, the present study provided easily reproducible protocols for the hydrothermal production of pure saponite, nontronite, or beidellite (i.e. with no other mineral). The successful synthesis of pure saponite was achieved by exposing the starting gels to 230°C for 4 days in solutions at pH ranging from 5.5 to 14. The successful synthesis of pure beidellite was achieved by exposing the starting gels to 230°C for 9 days in a solution at pH 12. The successful synthesis of pure nontronite was achieved by exposing the starting gels to 150°C for 2.5 days in a solution at pH 12.5. Although extrapolating experimental results to natural settings remains difficult, the results of the present study may be of great help to constrain better the geochemical conditions existing or having existed on extraterrestrial planetary bodies.

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Ergebnisse und Probleme von Verbindungen der Systeme Oxyd‐Wasser

Glemser

1961

Angewandte Chemie

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Vanadinhydroxide 4. Uranhydroxyde V. Bau fester AquoxydeDie bei Verbindungen der Systeme Oxyd-Wasser erzielten neuen Ergebnisse ermoglichen eine Systematik, die das gesamte Gebiet unter Berucksichtigung d e r drei Aggregatzustande unter einem einheitlichen Gesichtspunkt zusammenfa0t. Nach der Art der Wasserbindung werden vier Haupttypen unterschieden: Hydroxyde, Oxydhydrate, Hydronium-Verbindungen und Oxydaquate. Der Stand d e r Forschung wird in den Kapiteln ,,Gasfijrmige Hydroxyde", ,,Verbindungen durch hydrothermale Synthese", ,,Niederwertige Hydroxyde der ubergangsmetalle" und ,,Aufbau von festen Aquoxyden" beschrieben. die a k Schwerpunkte der modernen Entwicklung des Gebietes angesehen werden. 111. Verbindungen durch hydrothermale Synthese 1. System A1,03-H,0 2) R. Fricke u. G. F. Huttig, Hydroxyde und Oxydhydrate. Band IX des Handbuchs der allgemeinen Chemie, herausg. v. P. Walden, Akadem. Verlagsges. m.b.H., Leipzlg 1937. 3 ) 0. Glernser, Fortschr. chem. Forsch. 2, 273 [1951]. Vgl. auch W . 0. Milfigan, J . physic. Colloid Chem. 55, 497 [1951]. 4 ) Vgi. die Arbeiten von A. Simon u. Mitarb., 2.B. 2. anorg. allg. Chem. 242, 313 [1939]; K. W. F. Kohlrausch, Ramanspektren, Verlag Akad. Verlagsges. Becker u. Erler, Leipzlg 1943. 5 ) Lit. bei 0. Glernser3). 0) Fur das bewegliche Wasser (Adsorptions-bzw. Kapillarwasser) geben dieiektrische Messungen eine qualitative Auskunft (0. Glernser, 2. Elektrochem. 44, 341 [1938]; 45, 820 [1939]).

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Recent X-Ray Diffraction Studies on the Hydrous Oxides and Hydroxides.

Cited by 35 publications

References 13 publications

Interaction of Pu(IV,VI) hydroxides/oxides with metal hydroxides/oxides in alkaline media

Interaction of Pu(IV,VI) hydroxides/oxides with metal hydroxides/oxides in alkaline media

Influence of pH on the Hydrothermal Synthesis of Al-Substituted Smectites (Saponite, Beidellite, and Nontronite)

Ergebnisse und Probleme von Verbindungen der Systeme Oxyd‐Wasser

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