Compositional dependence of the valency state of Cr ions in oxide glasses

Relationship between the local structure and spontaneous emission probability of Er3+in silicate, borate, and phosphate glasses

“…, and Cr 31 was also reported in similar phosphate glasses [10,27,28]. We successfully performed a direct observation of the site selectivity between Er 31 and the PyO bond using EXAFS measurement.…”

Cr-doped titanite pigment based on industrial rejects

“…3, we can consider a band at 405 nm attributed with 3 A 2 → 3 T 2 (P) transfer of Cr(IV) [28][29][30] and a second one is located around 500 nm (≈20.000 cm −1 ) due to spin-allowed transition of octahedral Cr(III) from 4 A 2g ground state to the excited 4 T 1g (F) state [24]. These two sequential absorptions located in the violet (405 nm) and green-blue (500 nm) zones are responsible for the brown colour displayed by the pigment.…”

Optical Absorption of Cr-Containing Li2O-SiO2 System Transparent Glass-Ceramics

“…It was reported that the Cr 4{ and Cr 6{ ions occupy the tetrahedral coordination in glasses. 13), 14) However, no absorp tion of Cr 6{ ion could be appeared in visible region because of 3d 0 configuration. And the Cr 3{ containing transparent glass ceramics does not exhibit this phenomena mentioned here.…”