Chemically durable iron phosphate glasses are promising candidates for hosting nuclear wastes containing constituents like Cs2O and MoO3 that have lower solubility in more conventional borosilicate glasses. In this work, two series of Cs-Mo-Fe-phosphate glasses were prepared and characterized. For glasses in Series A (xCs2O∙(100-x)∙(15MoO3∙22.5Fe2O3∙62.5P2O5), x = 0, 7.5, 15.0, 22.5), increasing Cs2O contents increase the molar volume and decrease the glass transition temperature. Raman spectroscopy reveals that adding Cs2O breaks down linkages between MoO6 octahedra, replacing Mo O Mo and Mo O bonds with Mo-O−Cs+ bonds. Phosphate anion chromatography reveals that adding Cs2O has little effect on the phosphate anion distributions. For glasses in Series B (15Cs2O∙ yMoO3∙(28.75-y)Fe2O3∙56.25P2O5, y = 0, 5.75, 11.50, 17.25, 23.00, 28.75), the glass transition temperature decreases and the aqueous dissolution rates increase when MoO3 replaces Fe2O3. The formation of isolated MoO6 octahedra with Mo-O−Cs+ bonds results in an increase in the average phosphate anion-length in the MoO3-rich glasses. Mossbauer spectroscopy indicates that ferric ions dominate in both series, and that the average Fe-coordination number increases with increasing Cs2O content (series A) and with increasing MoO3 content (series B).

The structure and properties of cesium loaded Mo-Fe-phosphate glasses

The influence of BaO on the mechanical and gamma / fast neutron shielding properties of lead phosphate glasses

Structural, optical and electrical investigation of sodium phosphate glasses doped MoO3 for high power visible laser safety

FePO4 was successfully synthesized via a simple method as a heterogeneous catalyst for photo degradation of methyl violet 2B in aqueous solution. The FePO4 was identified by the X-ray diffraction, Fourier transform infrared spectroscopy analyses and the scanning electron microscopy image The analysis was completed by the pHPZC and the band gap energy. The photocatalytic performance of FePO4 was investigated using reduction of methyl violet 2B as a model reaction. The results showed that FePO4 had converted nearly 99% of methyl violet 2B under UV light with optimum operating conditions of 1 g L−1 of FePO4, natural pH (pH 6.75), and 10 mg L−1 of methyl violet 2B, a kinetic study was also realized. The recyclable character of the catalyst under the optimum conditions for three cycles was successfully investigated without any structural modification of the FePO4.

Removal of methyl violet 2B by FePO4 as photocatalyst

The technique of high-performance liquid chromatography (HPLC) has been used to probe the phosphate anion distribution in a variety of metal phosphate glasses including glasses made with trivalent metal cations (Al, In, Ga, La). The composition of each glass was chosen so that the average phosphate chain length was between 2 and 4 PO{sub 4} tetrahedra. The widths of the resulting phosphate anion distributions were determined directly from an analysis of the HPLC chromatograms. Literature values for the free energy of formation of the crystalline metal-orthophosphate compounds with respect to P{sub 2}O{sub 5} and the metal oxide, were compared to the chromatogram widths. It was found that the smaller the energy of formation, the wider the distribution of phosphate chains, and the greater the ease of glass formation.

/pdf/intermediate-range-order-in-simple-metal-phosphate-glasses-50xmyp1s17.pdf

Intermediate-range order in simple metal-phosphate glasses: The effect of metal cations on the phosphate anion distribution

The Effects of Crystallization and Residual Glass on the Chemical Durability of Iron Phosphate Waste Forms Containing 40 wt% of a High MoO3 Collins-CLT Waste

Structure and Properties of Mo-Fe-Phosphate Glasses

Na-Mo-Fe-phosphate glasses were prepared with reducing and oxidizing raw materials and the effects of the different Fe2+/Fe3+ and Mo5+/Mo6+ ratios on glass structure and properties were determined. M o ¨ ssbauer spectroscopy confirms significantly greater concentrations of Fe2+ ions in the reduced glasses and distorted Fe3+O4 sites preferred over the Fe3+O6 sites in the oxidized glasses. Raman spectroscopy reveals the presence of isolated Mo6+O6 sites in the oxidized glasses, and highly distorted Mo5+O5 sites in reduced Mo-rich glasses. The presence of specific Fe- and Mo-polyhedra is correlated with the average phosphate anion length, as characterized by high-pressure liquid chromatography. Generally, for the similar compositions, oxidized glasses have greater molar volumes than the reduced glasses, associated with the formation of isolated Mo6+O6 octahedra and the absence of highly crosslinked Mo5+OPO4 units. Tg increases with increasing Fe3+ fractions in the Fe-rich glasses, whereas for the Mo-rich glasses, Tg increases with greater Mo5+ fractions.

Redox effects on the structure and properties of Na-Mo-Fe-phosphate glasses

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The structure and properties of cesium loaded Mo-Fe-phosphate glasses

The Effects of Crystallization and Residual Glass on the Chemical Durability of Iron Phosphate Waste Forms Containing 40 wt% of a High MoO3 Collins-CLT Waste

Structure and Properties of Mo-Fe-Phosphate Glasses

Redox effects on the structure and properties of Na-Mo-Fe-phosphate glasses