Lead molybdate
Overview
Lead molybdate (PbMoO4) is an inorganic compound primarily recognized for its vibrant yellow color and stability under high temperatures. It is synthesized through the reaction of lead salts with molybdate solutions. Historically, it has been used as a pigment in ceramics and paints due to its non-fading properties. In industrial contexts, lead molybdate is valued for its optical properties, making it suitable for coatings and specialized glass applications. Its low solubility and thermal resistance further enhance its utility in high-temperature environments.
Physical and Chemical Properties
Lead molybdate exhibits a tetragonal crystal structure, contributing to its high density (6.92 g/cm³) and thermal stability up to 1060°C, where it decomposes without melting. The compound is insoluble in water but dissolves in acidic solutions, forming lead and molybdate ions. Its bright yellow hue is attributed to its electronic structure, which absorbs light in the blue spectrum. This property, combined with its chemical inertness, makes it a preferred choice for pigments in environments requiring long-term color stability.
Main Applications
The primary use of lead molybdate is in the manufacturing of yellow pigments for ceramics, paints, and plastics. Its opacity and resistance to UV degradation make it ideal for outdoor applications. Additionally, it serves as a corrosion inhibitor in coatings for metals. In optics, lead molybdate is employed in thin-film coatings for lenses and mirrors due to its refractive properties. It also finds niche applications in scintillation detectors and as a catalyst in certain chemical reactions.
Safety and Storage
Lead molybdate is toxic if ingested or inhaled, requiring strict handling protocols. Personal protective equipment (PPE) such as gloves, goggles, and respirators should be used when handling the powder. Workspaces must ensure adequate ventilation to prevent dust accumulation. Storage should be in sealed containers, away from acids and oxidizing agents, in a cool, dry environment. Spills must be contained and disposed of according to local hazardous waste regulations to prevent environmental contamination.
B2B Procurement Guide
Industrial buyers should prioritize suppliers that provide detailed certificates of analysis (CoA), including purity (typically 98-99.9%) and lead content verification. Compliance with regional regulations (e.g., REACH, RoHS) is critical for international trade. Bulk purchases (100kg+) often reduce costs, but buyers must confirm storage capabilities. Sample testing is recommended to ensure the material meets application-specific requirements, such as particle size for pigment uniformity.
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