The chemistry of the redox course of Gd(NO3)3 and
Eu(NO3)3 with urea follows the stoichiometry given below:
ð2 xÞGdðNO3Þ3 þ xEuðNO3Þ3 þ 5COðNH2Þ2
! Gd2xO3 : xEu þ 8N2 þ 10H2O þ 5CO2.
According the reaction above, the stoichiometry for the
preparation of Gd2O3:Eu3+ from Gd(NO3)3 and Eu
(NO3)3:urea was 1:2.5, and the amount of glycol was
optimized.
0.05 mol/L Gd(NO3)3 solution and 0.05 mol/L Eu(NO3)3
solution were prepared by dissolving Gd2O3 and Eu2O3 in
dilute HNO3 until the powders were all dissolved, then
evaporating the excess acid, after cooling to room
temperature, distilled water was added, and 0.05mol/L
urea solution was prepared by dissolving urea in distilled
water.
The chemistry of the redox course of Gd(NO3)3 andEu(NO3)3 with urea follows the stoichiometry given below:ð2 xÞGdðNO3Þ3 þ xEuðNO3Þ3 þ 5COðNH2Þ2! Gd2xO3 : xEu þ 8N2 þ 10H2O þ 5CO2.According the reaction above, the stoichiometry for thepreparation of Gd2O3:Eu3+ from Gd(NO3)3 and Eu(NO3)3:urea was 1:2.5, and the amount of glycol wasoptimized.0.05 mol/L Gd(NO3)3 solution and 0.05 mol/L Eu(NO3)3solution were prepared by dissolving Gd2O3 and Eu2O3 indilute HNO3 until the powders were all dissolved, thenevaporating the excess acid, after cooling to roomtemperature, distilled water was added, and 0.05mol/Lurea solution was prepared by dissolving urea in distilledwater.
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