NDLI: Influence of $Gd^{3+}$ co-doping on structural property of $CaMoO

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Rai, S. B. Singh, B. P. Singh, P. Ningthoujam, R. S. Parchur, A. K. Ansari, A. A.
Description	Author Affiliation: Singh BP ( Department of Physics, Indian Institute of Technology (BHU), Varanasi, 221005, India.)
Abstract	A facile auto-combustion route is used for the synthesis of $Gd^{3+}$ (2, 5, 7 and 10 at%) co-doped $CaMoO_{4}:Eu$ nanoparticles. X-ray diffraction study suggests that as-prepared samples have extra impurity phases in addition to main tetragonal phase of $CaMoO_{4},$ and such extra phases decrease as the annealing temperature increases from 600 to 900 °C. The crystal structure has been analysed using Rietveld program. It has space group $I4_{1}/a$ (88) and Z = 4 (number of $CaMoO_{4}$ formula units per unit cell). Average crystallite sizes of as-prepared, 600 and 900 °C annealed samples for 2 at% $Gd^{3+}$ are found to be ∼33, 48 and 61 nm, respectively. The lattice strains of 5 at% $Gd^{3+}$ co-doped $CaMoO_{4}:Eu$ for as-prepared and 900 °C are 0.001 and 0.002, respectively. Fourier transform infrared spectroscopy gives the absorption bands at ∼815 and 427 $cm^{−1},$ which are related to asymmetric stretching and bending vibrations of $MoO_{4}^{2−}$ tetrahedron. Particle morphology is studied using scanning and transmission electron microscopy (SEM and TEM), and aggregation of particles is found. X-ray photoelectron spectroscopy (XPS) is utilized to examine the oxidation states of metal ions/oxygen and oxygen ion vacancies in $Gd^{3+}$ co-doped $CaMoO_{4}:Eu.$ With an increase in $Gd^{3+}$ concentration, peaks corresponding to the $Gd^{3+}$ $(2p_{3/2}$ and $2p_{5/2})$ binding energy could be detected.
ISSN	14779226
Issue Number	12
Journal	Dalton Trans.
Volume Number	43
e-ISSN	13645447
Language	English
Publisher	Royal Society of Chemistry
Publisher Date	2014-03-28
Publisher Place	Great Britain (UK)
Access Restriction	Subscribed
Subject Keyword	Chemistry
Content Type	Text
Resource Type	Article
Subject	Inorganic Chemistry

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