3+ or Tb 3+ doped solid solutions (Y 1-xRE x) 4S 3(Si 2O 7)]]>

摘要

Y4S3(Si2O7) and its solid solutions (Y1-xREx)4S3Si2O7(RE = Eu x?=?0.010–0.085, RE=Tb x?=?0.010–0.500) were quantitatively prepared by reaction of starting compounds in molten CsCl. Single crystal X-Ray analysis revealed the difference in preference Eu3+occupancy for two independent RE-sites coming from volume difference of these sites. This effect is negligible for the Tb-containing solid solution due to smaller difference in radii Tb3+and Y3+ions. Tb3+-containing samples are luminescent with typical emission of Tb3+, while Eu3+-containing samples are not luminescent. The 1%Tb3+-containing sample emits in blue or in green color depending on the excitation wavelength. Measured melting points are 1545?±?15?°С for all investigated samples (Y1-xREx)4S3Si2O7.