Introduction to the concept of Bravi's Law
Bravi's conclusion is guided by the inference that the relative growth rate of different crystal planes on the crystal is inversely proportional to the density of the nodes on the screen. The so-called crystal plane growth rate refers to the thickness of the crystal plane in the vertical direction per unit time. The density of the nodes on the mesh surface of the crystal plane AB is the largest, and the spacing of the mesh plane is also the largest. The gravity of the mesh to the foreign particles is small, the growth rate is slow, the crystal plane expands laterally, and finally remains on the crystal; the CD crystal plane is next; BC The density of the nodes on the mesh surface of the crystal plane is the smallest, and the spacing between the mesh planes is small. The mesh has a large gravitational force on the foreign particles, the fastest growth rate, and the horizontal plane gradually shrinks so that the crystal plane eventually disappears. Therefore, the crystal plane on the actual crystal is often The surface with a larger node density on the screen.