Optical properties of Eu 3+ activated thorium molybdate and thorium tungstate: Structure, local symmetry and photophysical properties

Synthesis and photoluminescence properties of red emitting phosphor La2–xEuxLi0.5Al0.5O4 [x = 0.2–2] with K2NiF4 structure

“…However the relationship of the Ω 4 parameter is not straight with the environment and symmetry of Eu 3+ , but it is related to electron density surrounded by Eu 3+ ions. Its value decreases with increasing Eu 3+ content signifying an increase of electron density on ligands …”

Studies on thermophysical properties of ThW2O8 and UWO6

“…Recently, the crystal structure of orthorhombic ThW 2 O 8 has been derived by Keskar et al [20] using powder X-ray diffraction data. The orthorhombic phase of Th(MoO 4 ) 2 [27] was used as model compound for the refinement of ThW 2 O 8 structure using Rietveld analysis of the measured X-ray diffraction data.…”

“…The entropy of formation of transition metal molybdates and tungstates from component oxides has been calculated using the data reported in the literature [25] and found to vary within 10 J mol -1 K -1 . Hence, for ThW 2 O 8 (s) and UWO 6 (20). The computed thermodynamic functions for ThW 2 O 8 (s) and UWO 6 (s) are given in Tables 7 and 8, respectively.…”

“…In comparison with molybdates, thorium tungstates and uranyl tungstates are relatively less studied and only very few reports are available in the literature [8,[18][19][20][21][22][23][24].…”

“…He has derived the structure of thorium molybdate and reported that thorium tungstate is iso-structural to that of thorium molybdate. As detailed structural study of thorium tungstate was not reported, we have carried out the same from powder X-ray diffraction data using structural parameters of ThMo 2 O 8 as a model compound [20]. Recently, structural, thermal and Raman spectroscopic studies of thorium tellurium molybdates and tungstates have been carried out by Xiao et al [21] and showed that ThWTe 2 O 9 decomposes to give ThW 2 O 8 as a final product.…”