The physical properties of selenium mainly include the following:
1.Appearance & Color: Selenium is a solid metal from dark gray to steel gray with a metallic luster. It has a variety of allotropic forms, including variations of different colors and morphologies.
2.Crystal structure: Selenium has a variety of crystal structures, such as hexagonal crystal system, monoclinic crystal, cubic crystal, etc.
3.Density: At room temperature (20), the density of selenium is about 481 grams cubic centimeters.
4.Melting point and boiling point: The melting point of selenium is 217 and the boiling point is 685.
5.Electrical conductivity: Selenium is a semiconductor material that can behave as an n-type or p-type semiconductor at a certain temperature and under certain conditions, with electrical conductivity and thermal conductivity.
6.Reflectivity: Although selenium is not known to be highly reflective, its surface can reflect a certain percentage of light, although selenium is not typically used in optical instrument lens materials.
7.Allotropes: There are at least six known allotropes of selenium, which are stable under different temperature and pressure conditions and exhibit different physical properties.
8.Processability: Selenium is brittle at room temperature, but can be calendered or extruded at temperatures above 333K (about 60).
9.Photosensitivity: Selenium is sensitive to light, and its conductivity can be significantly changed under light, and its conductivity can be increased by more than 1,000 times in the dark under light.
Please note that due to the chemical activity of selenium, it is necessary to pay attention to its oxidation, volatilization and other characteristics in actual operation.