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How Many Stages Are Involved in the Thermal Decomposition Process of Ammonium Metatungstate? 40

The thermal decomposition process of ammonium metatungstate (AMT) is a complex, multi-stage reaction involving the removal of crystal water, structural phase transitions, and the eventual formation of tungsten oxide. Specifically, the thermal decomposition of AMT can be divided into the following stages: I. Low-Temperature Crystal Water Removal Stage AMT crystals contain crystal water molecules, the content of which varies depending on the preparation method. In this stage, AMT gradually releases crystal water, forming an anhydrous AMT intermediate. Thermogravimetric (TG) curves…

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What Is the Solubility of Ammonium Metatungstate in Ammonia Water? 44

Ammonium metatungstate (AMT), besides being soluble in dilute acid solutions such as dilute hydrochloric acid, dilute nitric acid, and acetic acid, can also dissolve in alkaline solutions like ammonia water. Ammonia water is a weakly alkaline solution formed by dissolving ammonia gas in water, with a pH typically ranging from 9 to 12, depending on concentration: low-concentration ammonia water has a pH of 9-10, while high-concentration ammonia water ranges from 11-12. The dissolution behavior of AMT in ammonia water is…

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Wire cut molybdenum wire 46

The wire cut molybdenum wire is a molybdenum product mainly made of refractory metal molybdenum (Mo). It is a thin wire made by forging and drawing molybdenum bars, and serves as a cutting wire for wire cutting machines. Its English name is “wire cut molybdenum wire”, and its diameter generally ranges from 0.12 to 0.20 mm. In terms of physical and chemical properties, the wire cut molybdenum wire is a black product as thin as a hair and has the…

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What Is the Solubility of Ammonium Metatungstate in Organic Solvents? 50

Ammonium metatungstate (AMT) is a highly water-soluble tungstate compound, widely used in tungsten chemical industries and catalyst preparation due to its high solubility in water (approximately 300-330 g/100 mL at 25°C). However, its solubility in organic solvents is significantly different, typically much lower or nearly insoluble. Below is an overview of AMT’s solubility in some common organic solvents: Methanol: AMT has relatively low solubility in methanol. Methanol, a polar organic solvent, has lower polarity than water. As an ionic compound,…

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What Is the Solubility of Ammonium Metatungstate in Dilute Acid Solutions? 40

Ammonium metatungstate (AMT) is an important tungsten compound, appearing as a white crystalline powder, primarily used in the production of tungsten powder, tungsten wire, hard alloys, and in fields such as petrochemicals, catalysts, and ceramics. Besides being soluble in water and certain organic solvents, AMT can also dissolve in dilute acid solutions. Dilute acid solutions typically refer to acidic aqueous solutions with a pH range of 2-5. Common acids include dilute hydrochloric acid (HCl), dilute nitric acid (HNO?), dilute sulfuric…

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How Much Ammonium Metatungstate Can Dissolve in Water? 38

The solubility of ammonium metatungstate (AMT) in water is one of its key physicochemical properties, attracting significant attention due to its wide applications in industry, catalyst preparation, and tungsten compound production. AMT exhibits high solubility in water, making it a well-soluble tungstate compound. At 25°C, its solubility is typically around 300 g/100 mL of water, meaning approximately 300 g of AMT can dissolve in 100 mL of water. At 20°C, its solubility in water is less than 2%. The solubility…

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Comparison of Barium Tungsten Electrodes and Lanthanum Tungsten Electrodes 37

Barium tungsten electrodes excel in electron emission efficiency, brightness, and resistance to poisoning, making them suitable for HID lamps, strobe lights, and other similar applications. Lanthanum tungsten electrodes, on the other hand, offer advantages in welding stability, arc column control, and safety, and are widely used in precision welding in the aerospace industry. Below is a detailed comparison: 1. Composition and Manufacturing Process Barium tungsten electrodes are composed of tungsten filaments and a barium-tungsten mixture, with barium added via an…

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Comparison of Barium Tungsten Electrode and Thorium Tungsten Electrode 32

Barium tungsten electrode and thoriated tungsten electrode are two common tungsten-based electrode materials, which are widely used in welding, electric light sources, electronic devices and other fields. The following is a comparative analysis from five dimensions: component characteristics, performance, application field, environmental safety and market trend: I. Composition and Basic Characteristics II. Performance Comparison 1. Electron Emission and Arc Initiation Thorium Tungsten Electrode: Due to the radioactive activation of thorium, it has stable arc initiation and good arc stiffness, suitable…

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Barium Tungsten Electrode for Transmission Electron Microscope 48

Transmission electron microscope (TEM) is a key analytical tool in the fields of materials science, nanotechnology and life sciences. Its core performance depends on the electron emission efficiency and stability of the electron gun. As the core material of the hot cathode electron source, the barium tungsten electrode significantly optimizes the imaging resolution and stability of TEM by reducing the work function and improving the electron emission ability. The barium tungsten electrode is composed of a tungsten matrix and a…

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Barium Tungsten Electrodes for Particle Detectors 35

Barium tungsten electrodes are composite materials made of tungsten and barium oxide. Due to their low work function, high thermal stability, and excellent electron emission properties, they are often used in detector components that require efficient electron emission or signal amplification. A low work function means that electrons can more easily escape from the electrode surface, providing a foundation for efficient electron emission. High thermal stability ensures that the electrode can maintain stable performance in high-temperature environments without easily deforming…

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