Paper Details

Potassium Fumarate Dihydrate (PFD) single crystal was successfully grown by conventional slowevaporation technique at room temperature. Fourier transform infrared spectroscopic analysis was performed for theidentification of functional groups present in the crystal. UV–vis–NIR transmittance spectrum was recorded in the regionof 200–1100 nm, which evidenced the good optical transparencies of the obtained crystals. The transmittance curveshowed the lower cut-off wavelength at 308 nm. Dielectric constant and dielectric loss were measured for the grownPFD crystals in the frequency range from 50 Hz to 12 kHz at four different temperatures namely 303, 323, 343 and 363K. The dielectric constant was observed to be little higher at low frequency region and decreases with increasingfrequency. The thermal stability of the grown crystal was investigated by using TG-DTA analysis. The grown crystal wasthermally stable up to 850° C. In TG-DTA spectrum, three stages of decomposition have been observed. The ACconductivity study using complex impedance spectroscopy was performed to characterize the bulk resistance of thegrown crystal. Vickers micro-hardness study was carried out to understand the mechanical properties of the growncrystal with varying loads ranging from 5 to 200 g. The hardness of the titled compound increases on increasing the loadand obeyed the reverse indentation size effect. The Meyer’s index number (n) has been calculated for the grownpotassium fumarate dihydrate (PFD) crystal as 2.14 suggest the PFD crystal belongs to soft material category. It wasobserved from results that the yield strength and stiffness constant are increasing with increase in the applied load. Thisfinds the suitability of the single crystal for various thermo mechanical applications.

A.T. Ravichandran, K. Mangaiyarkarasi, A. Manivel, “Spectral, Thermal, Electrical and Mechanical Properties of Potassium Fumarate Dihydrate (PFD) Single Crystals”, International Journal of Advance Engineering and Research Development (IJAERD), Vol. 5, Issue 19, pp. -, January 2018.