Molybdenum disulfide is the main component of molybdenite. Black solid powder with metallic luster. Chemical formula MoS₂, melting point 1185℃, density 4.80g/cm³ (14℃), Mohs hardness 1.0~1.5.
An important compound of boron, boric acid, is often used in medicine and to kill insects. Boric acid can be used to disinfect the eyes, especially in middle and high school chemistry laboratories.
GaN is a transparent crystalline material that has been used in LED production for nearly 30 years, and its high frequency performance allows the production of violet laser diodes.
GaN is a third-generation semiconductor material with a large forbidden band width, and its superiority in characteristics compared with the first-generation Si and second-generation GaAs.