Copper oxide is an inorganic compound with the chemical formula CuO, and it is a black copper oxide. It is slightly amphoteric, has some hygroscopic properties, is insoluble in water and ethanol, but easily dissolves in acids. Copper oxide decomposes to release oxygen at high temperatures and is thermally stable. Its appearance is a black or brown-black powder with a density of 6.31 g/cm³. Copper oxide has various applications. It is mainly used in the manufacture of artificial silk, ceramics, glazes and enamels, batteries, petroleum desulfurizers, and pesticides. Additionally, copper oxide is used in hydrogen production and as a catalyst, as well as in the manufacture of green glass.

Nickel oxide (NiO) is an inorganic compound with the chemical formula NiO. It appears as an olive green crystalline powder and is insoluble in water. It is primarily used as a bonding agent and coloring agent in enamels, as well as a pigment in ceramics and glass. It can also be used to produce magnetic materials such as nickel zinc ferrite. Nickel oxide has found widespread applications in optical coatings. For example, nickel oxide can be used to prepare optical components such as mirrors, filters, and polarizers; it can also be used to create smart windows and displays with electrochromic functions.

Tungsten oxide has a high melting point and boiling point, with a melting point of 1473°C and a boiling point above 1750°C. It is stable in air and insoluble in water. Tungsten oxide has various industrial applications, primarily used in the production of tungsten metal powder and tungsten carbide, which are further used to manufacture hard alloys and other tungsten products. Additionally, tungsten oxide has characteristics such as high specific gravity, good electrical conductivity, reducibility, and oxidizability.

Silicon-aluminum mixtures refer to a class of compounds composed of silicon and aluminum elements, with the chemical formula AlxSiyOz, where x, y, and z represent the quantities of silicon, aluminum, and oxygen atoms, respectively. Silicon-aluminum mixtures are widely found in nature, commonly occurring in rocks and soils, and are typically divided into two types: silicate and kaolinite. The physical and chemical properties of silicon-aluminum mixtures are closely related to their crystal structure. Silicon-aluminum mixtures are relatively stable substances with high melting points, making them difficult to melt, and they usually require complex physicochemical processes such as high temperature and high pressure for treatment.

Ferric oxide (Fe3O4) is an inorganic compound, also known as magnetic iron oxide or black iron oxide. It is a black crystalline substance with magnetic properties, insoluble in water, alkaline solutions, and organic solvents such as ethanol and ether, but soluble in acidic solutions. In a humid state, ferric oxide easily oxidizes to iron oxide (Fe2O3) in the air. Ferric oxide occurs naturally in the form of magnetite, with a high melting point (1594°C) and density (5.18 g/cm³). It has important applications in fields such as electronics, magnetism, and materials science, and can be used to prepare magnetic materials, electronic devices, and energy storage materials.

Niobium pentoxide is an inorganic compound with the chemical formula Nb2O5 and a molecular weight of 265.8098. It is a colorless, insoluble solid that turns yellow when heated. The relative density of niobium pentoxide is 4.47 g/cm3, with a melting point of 1485°C ± 5°C. It is insoluble in water but soluble in sulfuric acid and others. Niobium pentoxide has good chemical stability, which provides high stability and reliability during the preparation process. Additionally, the preparation technology for niobium pentoxide is relatively mature, allowing for the production of high-quality films through methods such as electron evaporation and ion sputtering.

Magnesium oxide is an inorganic compound with the chemical formula MgO, which is the oxide of magnesium. It is an ionic compound and appears as a white solid at room temperature. Magnesium oxide occurs naturally in the form of periclase and is a raw material for magnesium extraction. It has high refractory insulation properties. When calcined at temperatures above 1000°C, it can transform into a crystalline form, and when heated to 1500 - 2000°C, it becomes dead-burned magnesium oxide (magnesia) or sintered magnesium oxide. Magnesium oxide plays various important roles and has advantages in optical coatings. Its excellent optical properties, material characteristics, and wide range of applications make the development prospects of magnesium oxide in the optical field even broader.

Zinc selenide is a yellow crystalline solid that is odorless and tasteless, relatively stable, and can be stored for a long time in dry air without easily deteriorating. The crystal structure of zinc selenide belongs to the cubic crystal system and is a semiconductor material similar to diamond, exhibiting superior performance compared to other semiconductor materials like zinc sulfide. Zinc selenide plays a significant role and has advantages in optical coatings. Its excellent optical properties, wide range of applications, and the continuously evolving coating processes and preparation technologies make the application prospects of zinc selenide in the optical field even broader.

Yttrium fluoride (YF3) is a chemical substance that appears as a gray-white powder or crystal at room temperature, with a melting point of 1387°C, a boiling point of 2230°C, and a density of 4.01 g/mL. It is insoluble in water but can dissolve in strong acids. Yttrium fluoride is hygroscopic, chemically stable, insoluble in water, and difficult to dissolve in hydrochloric acid, nitric acid, and sulfuric acid, but it can dissolve in perchloric acid. Yttrium fluoride plays a significant role in optical coatings, and its excellent optical properties, chemical stability, and wide range of applications make it an important material in optical coating applications.

Ytterbium fluoride is a chemical substance with the chemical formula YbF3 and a molecular weight of 230.04. It is a white solid that appears as colorless hexagonal or orthorhombic crystals. The density of ytterbium fluoride is 4.01 g/mL, with a melting point of 1157°C and a boiling point of 2200°C. At room temperature and pressure, ytterbium fluoride is stable and insoluble in water and dilute acids. Ytterbium fluoride plays a significant role in optical coatings, and its excellent optical properties, chemical stability, and wide range of applications make it an important material in optical coating.

Hafnium dioxide is an inorganic compound with the chemical formula HfO2, which is an oxide of the element hafnium. At room temperature and pressure, it is a white solid that is poorly soluble in water and insoluble in hydrochloric acid and nitric acid, but it can dissolve in concentrated sulfuric acid and others. Hafnium dioxide plays an important role in optical coatings, and its excellent optical properties, physical and chemical characteristics, as well as its wide range of applications, make it a significant member of optical coating materials.

Yttrium oxide, also known as Y2O3, has a chemical formula of Y2O3 and a molecular weight of 225.81. It is a white crystalline powder with a slight yellow tint, insoluble in water and alkali, but soluble in acid and alcohol. Yttrium oxide easily absorbs carbon dioxide and water from the air, so it needs to be stored properly to prevent deterioration. Yttrium oxide plays an important role in optical coatings, and its excellent optical properties and wide range of applications make it a significant material in optical coating applications. During the coating process, it is essential to strictly control the process parameters to ensure that the performance and quality of the film meet the requirements.