It is often found as the hard, abrasive material carborundum. Its extensive use ... They have much in common with a defect in diamond called the nitrogen-vacancy centre, which forms when a ...

As the hardest substance made until then by humans, and second in hardness only to diamond, carborundum soon rose to prominence. Industries realised the abrasive utility of the substance and it ...

The hexagon edges of 1 or 2 mm width contain diamond grains and, the inside of hexagons contains porous green carborundum without diamond grains. The direction of hexagonal edges can be located ...