Second harmonic generation, optical, thermal, piezoelectric and mechanical properties of adipic acid-doped ADP crystals

Single crystals of pure and 2mol.% adipic acid (hexanedioic acid) -doped ammonium dihydrogen phosphate (ADP) were grown by conventional slow evaporation of aqueous solution technique. The powder X-ray diffraction and FT-IR analyses indicate that the crystals undergo considerable stress as a result of doping. UV-Vis studies show that the absorption of the adipic acid-doped crystals is less than that of pure ADP. Thermal studies (TG/DTG) disclose that the decomposition temperature of doped ADP is more than that of pure ADP. Vicker's microhardness study reveals that the addition of adipic acid increases the hardness of the ADP. SHG efficiency and piezoelectric charge coefficient of adipic acid-doped ADP are higher than that of pure ADP.