Rare earth garnet type ferrite compound and preparation method thereof

Abstract

The invention discloses a rare earth garnet type ferrite compound and a preparation method thereof, which belong to the technical field of inorganic materials and preparation processes thereof. The rare earth garnet type ferrite compound comprises R3Fe[5-y]MyO12, wherein R is Pr, Nd, Sm or Eu, M is Mn, Cr or V and y is more than or equal to 0 and less than3; and calcium or strontium can be doped at C bit. In the preparation method, trivalent rare earth nitrate and Fe(NO3)3 used as reactants, MnCl2 and the like as doped metal salts and KOH as a mineralizing agent are mixed, stirred and are subjected to alkalinity adjustment and hydrothermal reaction in the presence of a large amount of mineralizing agents. The invention discloses a preparation method of the rare earth garnet type ferrite compound which is difficult to synthesize and is unstable at high temperature and has the characteristics of simple operation, mild conditions, high reaction speed, good repeatability, low cost and the like; and in addition, by using the preparation method, a pure phase product with smooth and perfect crystal can be synthesized, the grain diameter of the product is small to several hundreds of nanometers and the monocrystal X-ray analysis can be carried out when the grain diameter is approximately dozens of micrometers.

Description

Rare earth garnet type ferrite compound and preparation method thereof technical field The invention belongs to the technical field of inorganic materials and preparation techniques thereof, and relates to high-temperature thermodynamically unstable rare earth (Pr3+, Nd3+) garnet-type ferrite compounds with large ion radii and hydrothermal treatment of other rare-earth garnet-type ferrite compounds preparation. Background technique The molecular formula of garnet-type ferrite compound is similar to natural garnet R3Al2(SiO4)3, R is Fe or Mn, the crystal structure belongs to the body-centered cubic system, and the space group is la-3d. Each unit cell contains 8 molecular formulas, and Fe ions occupy 24 tetrahedral central gaps (24d) and 16 octahedral central gaps (16a), respectively. Y3+ or other trivalent rare earth element ions or other elements with slightly larger ionic radii are located at the center (24c) of 24 dodecahedrons, which are composed of eight neighbor oxyg...

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Problems solved by technology

The disadvantage of these methods is that they all go through a high temperature process.

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