Rare earth/rare earth elements
Lanthanide elements with atomic numbers ranging from 57 to 71 in the periodic table, namely lanthanum (La), cerium (Ce), praseodymium (Pr), neodymium (Nd), promethium (Pm)
Samarium (Sm), europium (Eu), gadolinium (Gd), terbium (Tb), dysprosium (Dy), holmium (Ho), erbium (Er), thulium (Tm), ytterbium (Yb), lutetium (Lu), as well as scandium (Sc) with atomic number 21 and yttrium (Y) with atomic number 39, totaling 17 elements
The symbol RE represents a group of elements with similar chemical properties.
At present, in the rare earth industry and product standards, rare earths generally refer to 15 elements except for promethium (Pm) and scandium (Sc).
Light rare earth
The general term for the four elements of lanthanum (La), cerium (Ce), praseodymium (Pr), and neodymium (Nd).
Medium rare earth
The general term for the three elements of Samarium (Sm), europium (Eu), and gadolinium (Gd).
Heavy rare earth
The general term for the eight elements of terbium (Tb), dysprosium (Dy), holmium (Ho), erbium (Er), thulium (Tm), ytterbium (Yb), lutetium (Lu), and yttrium (Y).
Cerium grouprare earth
A group of rare earths mainly composed of cerium, including six elements: lanthanum (La), cerium (Ce), praseodymium (Pr), neodymium (Nd), Samarium (Sm), europium (Eu).
Yttrium group rare earth
A group of rare earth elements mainly composed of yttrium, including gadolinium (Gd), terbium (Tb), dysprosium (Dy), holmium (Ho), erbium (Er), thulium (Tm), ytterbium (Yb), lutetium (Lu), andyttrium (Y).
Lanthanide shrinkage
The phenomenon where the atomic and ionic radii of lanthanide elements gradually decrease with the increase of atomic number is called lanthanide contraction. Generated
Reason: In lanthanide elements, for every proton added to the nucleus, an electron enters the 4f orbital, and the 4f electron does not shield the nucleus as much as the inner electrons, so as the atomic number increases
Plus, checking the attraction of the outermost electrons enhances, gradually reducing the atomic and ionic radii.
A general term for metals produced by molten salt electrolysis, metal thermal reduction, or other methods using one or more rare earth compounds as raw materials.
A metal obtained from a compound of a certain rare earth element by molten salt electrolysis, metal thermal reduction, or other methods.
Mixed rare earth metals
A general term for substances composed of two or more rare earth metals, usually lanthanum cerium praseodymium neodymium.
The general term for compounds formed by the combination of rare earth elements and oxygen elements, usually represented by the chemical formula RExOy.
Single rare earth oxide
A compound formed by the combination of a rare earth element and oxygen element.
High purity rare earth oxide
A general term for rare earth oxides with a relative purity of not less than 99.99%.
Mixed rare earth oxides
A compound formed by the combination of two or more rare earth elements with oxygen.
Rare earth compound
A general term for compounds containing rare earths formed by the interaction of rare earth metals or rare earth oxides with acids or bases.
Rare earth halide
The general term for compounds formed by the combination of rare earth elements and halogen group elements. For example, rare earth chloride is usually represented by the chemical formula RECl3; Rare earth fluoride is usually represented by the chemical formula REFy.
Rare earth sulfate
The general term for compounds formed by the combination of rare earth ions and sulfate ions, usually represented by the chemical formula REx (SO4) y.
The general term for compounds formed by the combination of rare earth ions and nitrate ions, usually represented by the chemical formula RE (NO3) y.
Rare earth carbonate
The general term for compounds formed by the combination of rare earth ions and carbonate ions, usually represented by the chemical formula REx (CO3) y.
Rare earth oxalate
The general term for compounds formed by the combination of rare earth ions and oxalate ions, usually represented by the chemical formula REx (C2O4) y.
Rare earth phosphate
The general term for compounds formed by the combination of rare earth ions and phosphate ions, usually represented by the chemical formula REx (PO4) y.
Rare earth acetate
The general term for compounds formed by the combination of rare earth ions and acetate ions, usually represented by the chemical formula REx (C2H3O2) y.
Alkaline rare earth
The general term for compounds formed by the combination of rare earth ions and hydroxide ions, usually represented by the chemical formula RE (OH) y.
Rare earth stearate
The general term for compounds formed by the combination of rare earth ions and stearate radicals, usually represented by the chemical formula REx (C18H35O2) y.
Rare earth citrate
The general term for compounds formed by the combination of rare earth ions and citrate ions, usually represented by the chemical formula REx (C6H5O7) y.
Rare earth enrichment
The general term for products obtained by increasing the concentration of rare earth elements through chemical or physical methods.
Rare earth purity
The mass fraction of rare earth (metal or oxide) as the main component in the mixture, expressed as a percentage.
Relative purity of rare earths
Refers to the mass fraction of a certain rare earth element (metal or oxide) in the total amount of rare earth (metal or oxide), expressed as a percentage.
Total rare earth content
The mass fraction of rare earth elements in products, expressed as a percentage. Oxides and their salts are represented by REO, while metals and their alloys are represented by RE.
Rare earth oxide content
The mass fraction of rare earths represented by REO in the product, expressed as a percentage.
Single rare earth content
The mass fraction of a single rare earth in a compound, expressed as a percentage.
Rare earth impurities
In rare earth products, rare earth elements other than the main components of rare earth products.
Non rare earth impurities
In rare earth products, other elements besides rare earth elements.
Burn reduction
The mass fraction of rare earth compounds lost after ignition under specified conditions, expressed as a percentage.
Acid insoluble substance
Under specified conditions, the proportion of insoluble substances in the product to the mass fraction of the product, expressed as a percentage.
Water solubility turbidity
The turbidity of quantitatively dissolved rare earth halides in water.
Rare earth alloy
A substance composed of rare earth elements and other elements with metallic properties.
Rare earth intermediate alloy
The transition state rare earth alloy required for the production of rare earth products.
Rare earth functional materials
Using rare earth elements as the main component and utilizing their excellent optical, electrical, magnetic, chemical and other special properties, special physical, chemical, and biological effects can be formed to achieve success
A type of functional material that can be transformed into each other. Mainly used as high-tech materials for manufacturing various functional components and applied in various high-tech fields. Commonly used rare earth functional materials include rare earth luminescent materials and rare earth magnetism
Materials, rare earth hydrogen storage materials, rare earth polishing materials, rare earth catalytic materials, etc.
Rare earth additives
In order to improve the performance of the product, a small amount of rare earth containing substances are added during the production process.
Rare earth additives
Rare earth compounds that play a functional auxiliary role in chemical and polymer materials. Rare earth compounds serve as additives in the preparation and processing of polymer materials (plastics, rubber, synthetic fibers, etc.)
The use of functional additives has unique effects in improving the processing and application performance of polymer materials and endowing them with new functions.
Slag inclusion
Oxides or other compounds carried in materials such as rare earth metal ingots, wires, and rods.
Rare earth partitioning
It refers to the proportional relationship between the contents of various rare earth compounds in mixed rare earth compounds, generally expressed as the percentage of rare earth elements or their oxides.
Post time: Oct-30-2023