Structural, magnetic, dielectric and thermal analysis of gel grown pure and doped cadmium tartrate crystals.

Pure and doped cadmium tartrate crystals of different morphology have been synthesized. They were obtained using a gel technique. The metallic composition of the crystals was estimated using energy dispersive X-ray analysis (EDAX). The coloration of the crystals changed with the type and composition of metallic content. Fourier transform infrared spectroscopy (FT-IR) suggested the presence of O H, C O, C O and metal-oxygen bonds. Powder X-ray diffraction (XRD) suggested the crystalline nature of the material and indicated the changes in unit cell volume as doping occurred. The unit cell volume for pure cadmium tartrate crystal was found to be 881.440 Å 3 , for Cu 2+ doped cadmium tartrate 811.885 Å 3 , for Fe 2+ doped cadmium tartrate 767.486 Å 3 and for Mg 2+ doped cadmium tartrate 788.481 Å 3 . The magnetic susceptibility and magnetic moment for the crystals were determined by using the Gouy's method. The magnetic moment of pure cadmium tartrate, Cu 2+ doped cadmium tartrate, Fe 2+ doped cadmium tartrate and Mg 2+ doped cadmium tartrate crystals was found to be 3.84 BM, 1.33 BM, 2.76 BM and 3.64 BM, respectively. Thermogravimetric (TG) analysis of pure and doped cadmium tartrate crystals suggest the possibility of the presence of co-ordinated water molecules in the crystalline structure. There are two stages of decomposition for the materials. The first is a minor stage of decomposition, the second is the major stage of decomposition, which is confirmed through differential scanning calorimetry (DSC). At the completion of decomposition only metal oxide remains for both pure and doped crystals. The addition of dopants into the pure cadmium tartrate crystals has an appreciable effect on the dielectric properties such as dielectric constant and dielectric loss of the crystal. [ABSTRACT FROM AUTHOR]