SOLIDIFICATION BEHAVIOR OF BINARY ORGANIC EUTECTICS AND 1 2 ADDITION-COMPOUNDS/

Due to possibility of visual observation of phase transformations and processes during solidification, the binary alloy models are important in materials and metallurgical science. As such, phase diagram, linea r velocity of crystallization, microstructure and spectral behaviour o f binary organic systems of benzidine with resorcinol and catechol inv olving formation of addition compound with congruent melting point hav e been studied. While their phase diagrams show the formation of two e utectics and a 1:2 (B:RC, B:CT) addition compound in each case, the cr ystallization data obey the Hillig-Turnbull equation. The microstructu ral investigations give the characteristic morphology of the eutectics and the addition compounds, the spectral studies suggest intemolecula r hydrogen bonding between two components forming the molecular comple x.