Premium
Growth and Thermal, Electrical, Structural Characterization of Mixed Hydrated Single Crystal
Author(s) -
Naware S. P.,
Kelkar D. S.
Publication year - 2009
Publication title -
macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 1022-1360
DOI - 10.1002/masy.200950312
Subject(s) - crystallization , water of crystallization , dielectric , crystal (programming language) , analytical chemistry (journal) , lattice constant , conductivity , crystal growth , aqueous solution , single crystal , molecule , chemistry , electrical resistivity and conductivity , crystallography , crystal structure , materials science , diffraction , inorganic chemistry , organic chemistry , optics , programming language , engineering , physics , electrical engineering , optoelectronics , computer science
Mixed single crystal was made by mixing saturated aqueous solutions of NiSO 4 · 6H 2 O and CuSO 4 · 5H 2 O by volume (80:20) and the mixture was kept to form the crystals at room temperature by slow evaporation process. After some days, big pieces of greenish blue, dark colored crystals were grown. To determine the weight of NiSO 4 · 6H 2 O and CuSO 4 · 5H 2 O in the crystal, Ni‐DMG complexiometrical and EDTA gravimetrical analysis was done respectively. From this analysis it was concluded that 5.8 molecules of water of crystallization is present in the mixed single crystal. The crystals were characterized by UV‐Visible, FTIR and single crystal X‐ray diffraction studies. From single crystal XRD lattice parameters have been calculated. All these structural analysis confirms formation of new single crystal. Further, DTA‐TGA, dc electrical conductivity and dielectric constant studies were done from the room temperature to 400 °C.From DTA studies it was observed that 5.8 molecules of water of crystallization get dehydrated in four major steps at temperature 115 °C, 150 °C, 240 °C and 325 °C respectively corresponding to the detachment of 1 mole, 3 moles, 1 mole and 0.8 mole of water of crystallization. DC electrical conductivity and dielectric constant studies also show close agreement to the dehydration steps. The observed peaks in the conductivity verses temperature graph have been explained on the basis of release of water molecules and subsequent dissociation of these released water molecules into H + and OH − ions.