A kind of preparation method of ytterbium doped bismuth iridate pyrochlore polycrystalline material

Abstract

The invention relates to the technical field of preparation of pyrochlore polycrystalline materials, and discloses a Yb 3+ A preparation method of doped bismuth iridate pyrochlore polycrystalline material. The method includes the following steps: (1) Yb 2 O 3 Powder, Bi 2 O 3 Powder and IrO 2 After the powder is mixed, the first calcination is carried out; (2) the mixture after the first calcination in the step (1) is ground and pressed into a disk, and the second calcination is carried out; (3) the second calcination in the step (2) is carried out. The calcined mixture is ground and pressed into discs, and calcined for the third time to obtain Bi 2‑x Yb x Ir 2 O 7 crystal, where 0≤x≤1.5. The preparation process of the method is simple, but the preparation efficiency is high. At the same time, the invention solves the problems of material overflow or carry-out during the grinding process by grinding with a grinding rod, resulting in mismatch of stoichiometric ratios, resulting in the generation of impurity phases of compounds, and waste of raw materials.

Description

technical field [0001] The invention relates to the technical field of preparation of pyrochlore polycrystalline materials, in particular to a kind of ytterbium (Yb 3+ ) preparation method of bismuth iridate pyrochlore polycrystalline material. Background technique [0002] Ytterbium (Yb) is one of the important rare earth magnetic elements, and its electronic configuration is 4f 14 6s 2 , in the trivalent lanthanide rare earth elements Yb 3+ has a smaller ionic radius, which is Yb 3+ The magnetic moment is 4.5μ B . Use Yb 3+ Doping bismuth iridate (Bi 2 Ir 2 o 7 ) to obtain the pyrochlore-structured polycrystalline material Bi 2-x Yb x Ir 2 o 7 (0≤x≤1.5), can effectively reduce the lattice constant, and at the same time, the increase of Yb-doped components can lead to stronger Yb-Ir antiferromagnetic exchange, so that the compound has enhanced antiferromagnetic (AFM) properties . On the other hand, the reduced radius of the A site leads to a reduced Ir-O-Ir...

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Problems solved by technology

[0004] The purpose of the present invention is in order to overcome prior art existence in traditional high-temperature solid state reaction IrO 2 The steam is easy to volatilize, causing the stoichiometric ratio to be mismatched, resulting in the compound phase; at the same time, the preparation process of the pyrochlore polycrystalline sample in the prior art is complicated and the preparation efficiency is low. During the grinding process of the raw material, it is easy to overflow or carry out of the material, resulting in a mismatch of the stoichiometric ratio, causing the compound to produce an impurity phase, and the problem of waste of raw materials, providing a Yb 3+ A method for preparing bismuth iridate-doped pyrochlore polycrystalline material, the method has the advantages of high preparation efficiency, and the raw material is not easy to overflow or carry out the material during the grinding process

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