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|Title:||Gel growth and characterisation of cerium neodymium oxalate|
|Authors:||John, Mercy V|
Ittyachen, M A
|Abstract:||Cerium neodymium oxalate single crystals have been grown in silica gel by the diffusion of a mixture of aqueous solutions of the respective rare earth nitrates into a test tube having a set gel in which oxalic acid is incorporated. Rose coloured, transparent, cubical or hexagonal crystals of various dimensions have been under different growth parameters. Infrared (IR) spectrum confirms the presence of water molecules and carboxylic acid. X-ray diffraction (XRO) pattern of these samples reveals the crystalline nature. Diffraction peaks are indexed. Unit cell parameters are determined. Thermogravimetric analysis (TGA) and differential thermal analysis (DTA) data support the presence of 9H2O molecules attached to the crystal lattice which are lost around 100 and 175oC as revealed by the double peaked endotherm record. Exothermic peak at 350oC shows the release of CO and CO2 Elemental analysis done by energy dispersive X-ray fluorescence (EDXRF) for the mixed rare earth compound is in good agreement with experimental and theoretical values.|
|ISSN:||0975-1041 (Online); 0019-5596 (Print)|
|Appears in Collections:||IJPAP Vol.37(02) [February 1999]|
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