Abstract
The morphology and lattice imperfection of greigite crystals have been studied in connection with pH of the solution by means of electron microscopy. (1) Crystals, synthesized at pH 9 at 180 °C, are usually of rhombic plate form with a surface plane (100). Some regions in a platelet show a different contrast, extending along the {111} planes with a thickness of about 10 Å. These are lattice imperfections attributable to the local deviation of the chemical composition. (2) On decreasing the pH of the solution the required preparation temperature is lower. At pH 3 greigite crystals elongate in the [110] direction when prepared at 80 °C. It is considered that mackinawite (FeS) rapidly reacts with amorphous sulfur in the solution to produce the needle-like greigite. (3) Crystals synthesized in the solution including manganese ions, are mostly of disk-like form and often contain twins. They are stable on heating up to 220 °C.
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