EPR and optical absorption studies of VO2+ ions in alkaline earth aluminoborate glasses

Theoretical investigation of EPR and optical spectra of Mo(V) in [Mo6O19][N(C4H9)4]3 salt

“…In the present work, two bands (11,600 and 20,400 cm À 1 ) of the assignments are, respectively, 2 B 2g -2 B 1g and 2 B 2g -2 A 1g transitions. The d-d transitions obtained from the above calculations are consistent with many research results for a d 1 ion in tetragonally compressed octahedron [18][19][20][21] and can be regarded as rational. g factors varied with the R J as shown in Fig.…”

“…1, the effect of an Table 2 octahedral environment on the d orbitals of a TM ion may be treated as a splitting of the original group of five orbitals into three lower 2 T 0 2g and two upper 2 E 0 g orbitals under cubic field. There are many reports on the C 4v crystal field [18][19][20][21], the 2 T 2g level is further split into 2 B 2g (9d xy S) and 2 E g (9d xz S, 9d yz S) levels, and 2 E 0 g level into 2 B 1g (9d x 2 Ày 2 S)and 2 A 1g (9d z 2 S) levels. Thus, the assigned transitions of the literature [6] may be inaccurate.…”

Spectroscopy and structural state of V4+ ions in lithium aluminosilicate glass and glass–ceramics

“…4. The EPR spectra of these samples show very similar patterns to results for other glass system containing vanadium [23][24][25][26][27]. These spectra show a well resolved hyperfine structure typical for vanadyl ions in C 4v symmetry with tetragonally distorted octahedral coordination, and the line feature is typical of the unpaired (3d 1 ) electron of VO 2+ ions associated with 51 V in an axially symmetric crystal field.…”

“…Thus, the behavior of vanadium in glasses is interesting in the investigation of glass local structure. In the various phosphate [23], borate [24][25][26][27] and calcium alumina silicate [28,29], glasses containing V 2 O 5 , V 4+ has been found as a tetragonally distorted octahedral VO 2+ complex. In spite of various studies on V 2 O 5 -doped glasses, however, there is no study devoted to vanadium doped LAS glass-ceramics.…”

Role of Hydrogen in Defining the n-Type Character of BiVO4 Photoanodes

“…The paramagnetic 3d 1 electronic configuration of V 4+ , which may be present due to incorporation of defects and/or self-trapping of electrons, is characterized by electron-nuclear hyperfine splitting that arises from the magnetic interaction of the electron spin (S = ½) with the nuclear spin (I = 7/2) of 51 V (99.5% isotope abundance). [39][40][41][42] Thus, for an isolated electron interacting with a single 51 V nucleus, eight hyperfine lines should be observed. As shown in Fig.…”