Local structural investigations and speciation of uranium in Sr2P2O7 by time resolved emission spectroscopy and Sr K-edge EXAFS

Revealing the oxidation number and local coordination of uranium in Nd 2 Zr 2 O 7 pyrochlore: A photoluminescence study

“…in case of the silicate [3], pyrophosphate [11], borophosphate [12] and borate matrices [13], uranium gets stabilized as uranyl (UO 2 2 þ ), whereas, in case of the tetraborate [14] and zirconate [15] matrices, it was the octahedral uranate species, UO 6 6 À that gets stabilized preferentially. This difference is probably because of U-O bond length.…”

“…Depending upon the crystal filed of host lattice; uranium can stabilize in different forms of U(VI) in solids. Based on some of the recent work from our laboratory it was observed that uranium stabilizes as UO 2 2 þ in Sr 2 SiO 4 , SrBPO 5 , Sr 2 P 2 O 7 , ThO 2 , YBO 3 [3,[11][12][13][14] whereas as UO 6 6 À in SrZrO 3 , SrB 4 O 7 [15,16] etc.…”

The effect of Li+ ions on the luminescent properties of a single-phase white light-emitting phosphor α-Sr2P2O7:Dy3+

“…10,11 LaPO 4 :Ce 3+ ,Tb 3+ , as a famous green light emitting phosphor, has been applied in lamp industry for many years. α-Sr 2 P 2 O 7 :Ce 3+ , α-Sr 2 P 2 O 7 :U 6+ , and α-Sr 2 P 2 O 7 :Bi 2+ ; [12][13][14] (2) energy transfer process among different activators in α-Sr 2 P 2 O 7 host, e.g. Many research groups have given considerable attention to the luminescence properties of α-Sr 2 P 2 O 7 -based phosphors for potential application in display and lighting regions.…”

Photoluminescence properties of U in SrBPO5 host: Effect of concentration and annealing temperature

“…Another possibility is that the Uranium ion before reaching the lattice sites got stabilized in the interstitial sites without affecting the cell parameters. Recently it has been strongly emphasized that in strontium pyrophosphate (Sr 2 P 2 O 7 ) matrix uranium got stabilized at regular Sr 2 þ site [19]. In present case uranium may be stabilized in the same manner.…”

“…In this regard, the nature of uranium emission spectra has been studied in many matrices. In the series of matrices, phosphate based host lattices are well investigated and it has been observed that matrices like Sr 3 (PO 4 ) 2 , SrP 2 O 7 offer the regular Sr 2 þ lattice sites to stabilize uranium as U(VI) without affecting the crystal structure [18,19]. Recently Kumar et al have reported the stabilization of uranium as uranyl in one of the borophosphate based host i.e.…”