Different physical properties of crystals and non-crystals
- Mar 27, 2018 -

Crystals and non-crystals therefore contain different physical properties, mainly due to their different microstructures. The particles that make up the crystal—the atoms are symmetrically arranged, form a very regular geometric space lattice. The spatial lattices are arranged in different shapes and appear as macroscopically unique crystals with different geometric shapes. The atoms that make up the lattice interact with each other, and their role is mainly electrostatic. For each atom, the total effect of other atoms on it makes them all in the lowest state of potential energy, so it is very stable, and macroscopically it shows that the shape is fixed and it is not easy to change. There is a regular arrangement of atoms inside the crystal, causing the crystal to have different physical properties. For example, the regular arrangement of atoms can make several crystal planes appear inside the crystal, and the cube salt has three groups of planes parallel to its side surfaces. If the external force acts in the direction parallel to the crystal plane, the crystal can easily slide (deform), and this deformation is not easily restored, which is called the elasticity of the crystal. From here, we can see that along the direction of the crystal plane, its elastic limit is small, as long as it is slightly increased, it exceeds its elastic limit, making it unable to recover; while in other directions there is a large elastic limit, can withstand greater pressure, Pulling force still meets Hooke's law. When the crystal absorbs heat, because the atoms are arranged differently in different directions and the spacing is different, the amount of heat absorbed is also different, so that there are different heat transfer coefficients and expansion coefficients.

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