Synthesis, thermal decomposition and dielectric behavior of bis(thiourea)silver(I)nitrate.

Sivakumar, N.; Kanagathara, N.; Gayathri, K.; Krishnan, P.; Anbalagan, G.

New semi-organic bis(thiourea)silver(I)nitrate (TuAgN) single crystals have been grown from slow evaporation solution growth technique. Single crystal X-ray diffraction study reveals that the crystal belongs to orthorhombic system with the non-centrosymmetric space group C2221 and the calculated cell parameters are a = 33.3455 (6) Å, b = 45.2957 (7) Å, c = 20.3209 (5) Å, α = β = γ = 90°, and V = 30692.8 (10) Å. The thermal stability and decomposition behavior of TuAgN compound have been studied by thermogravimetric analysis at three different heating rates 5, 10, and 15 °C min. The effective activation energy ( E) and pre-exponential factor (ln A) of thermal decomposition of thiourea from TuAgN compound at three different heating rates are estimated by model free methods: Arrhenius, Flynn-Wall, Kissinger, and Kim-Park. The calculated effective activation energies were found to vary with the fraction ( α) reacted. The compensation effect between the (ln A) and ( E) has also been studied. Dielectric properties of TuAgN crystal have been studied in a wide range of frequencies and temperatures. AC conductivity has also been carried out.

SILVER nitrate; CHEMICAL decomposition; CRYSTAL growth; EVAPORATION (Chemistry); X-ray diffraction; ELECTRIC properties of metals; THERMAL properties of metals; CHEMICAL synthesis

Journal of Thermal Analysis & Calorimetry, 2014, Vol 115, Issue 2, p1295

1388-6150

Academic Journal

10.1007/s10973-013-3430-7