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Properties and Applications of Molybdenum
2026-02-02
Molybdenum (chemical symbol Mo, atomic number 42) is an important transition metal that was discovered in 1781 by the Swedish chemist Peter Jacob Hjelm. Its name derives from the Greek word “molybdos,” meaning “lead,” because early miners mistakenly believed its ore to be lead ore. As a metal with unique physical and chemical properties, molybdenum does not occur in nature in its pure metallic form; it is primarily found in compounds such as molybdenite. Molybdenum is an indispensable key material in numerous fields, including modern industry, agriculture, and medicine, and the breadth and depth of its applications continue to expand with advances in science and technology.
I. Core Characteristics of Molybdenum
Molybdenum exhibits both the general versatility of metals and unique intrinsic properties, particularly outstanding performance in high-temperature stability, mechanical properties, and chemical compatibility. These characteristics underpin its wide range of applications, which can be broadly categorized into physical properties and chemical properties.
(1) Physical Properties
Molybdenum is distinguished by its exceptionally high melting and boiling points—2,622°C and 4,639°C, respectively—ranking second only to a few metals such as tungsten and tantalum. Consequently, it exhibits outstanding resistance to high temperatures, maintaining stable structural integrity and mechanical properties even under extreme thermal conditions, with minimal risk of melting, deformation, or softening. At room temperature, pure molybdenum appears as a silver-white, lustrous metallic mass that is both hard and moderately ductile, with a Mohs hardness of 5.5 and a density of 10.2 g/cm³. Its combination of high strength and low density makes it well suited for fabrication into a wide range of forms, including sheets, wires, and tubes.
In addition, molybdenum exhibits excellent electrical and thermal conductivity; its electrical conductivity is approximately 30% that of copper, and it maintains outstanding electrical stability at high temperatures, making it well suited as a high-temperature conductive material. Moreover, molybdenum has a low coefficient of thermal expansion and high thermal conductivity, enabling it to effectively withstand the stresses induced by rapid temperature changes and reducing the likelihood of cracking and other related failures. Notably, molybdenum sulfides, such as molybdenum disulfide, possess a unique layered structure that imparts exceptional lubricating properties.
(II) Chemical Properties
Molybdenum exhibits relatively stable chemical properties; at room temperature, it does not readily react with oxygen or water, and a dense oxide film naturally forms on its surface, providing effective resistance to corrosion by most acids and bases. It is soluble only in hot concentrated sulfuric acid, nitric acid, and other strong oxidizing acids. As a transition metal, molybdenum can exist in multiple oxidation states—most commonly +4, +5, and +6—and can form stable compounds with a wide range of elements, such as molybdenum oxides, molybdates, and molybdenum sulfides. These compounds play important roles in catalysis, the chemical industry, electronics, and other fields.
Molybdenum’s chemical properties are also reflected in its outstanding catalytic activity: molybdenum and its compounds can accelerate a wide range of chemical reactions while exhibiting high selectivity and strong stability, making them resistant to deactivation during reaction. Moreover, molybdenum is non-toxic and harmless to humans as well as to animals and plants; its compounds can replace toxic metals such as lead and chromium in pigments and coatings, thereby enhancing product safety.
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