Single-phase multi-ferric material and preparation method thereof

A multi-ferroic material and single-phase technology, applied in chemical instruments and methods, iron compounds, manganate/permanganate, etc., can solve problems such as limited perovskite oxides

Inactive Publication Date: 2011-11-23
PEKING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, so far, only a handful of room-temperature multiferroic materials have been discovered, and most of them are confined to perovskite oxides.

Method used

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  • Single-phase multi-ferric material and preparation method thereof
  • Single-phase multi-ferric material and preparation method thereof
  • Single-phase multi-ferric material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Preparation of KBiFe in the above single-phase multiferroic materials 2 o 5 The hydrothermal synthesis method, specifically:

[0029] 1) The reaction raw material Bi(NO 3 ) 2 and Fe(NO 3 ) 3 Both were made into a clear solution, and the solution was taken according to the molar ratio of 1:2, and stirred evenly on a magnetic stirrer;

[0030] 2) Add KOH solid directly to the above mixed solution to make the alkalinity of the solution reach more than 5mol / L, and mix the mixture evenly under continuous stirring;

[0031] 3) After the above mixture is cooled to room temperature, transfer it to a reactor with a filling degree of less than 80%, react in a 393-533K oven for 1-7 days, then cool the reactor to room temperature, and release the pressure;

[0032] 4) The synthesized sample was cleaned with deionized water, and ultrasonically treated in an ultrasonic oscillator to obtain a small black crystal sample, and finally the sample was dried in an oven at 60°C.

Embodiment 2

[0034] Preparation of CsBiFe in the above single-phase multiferroic materials 2 o 5 The hydrothermal synthesis method, specifically:

[0035] 1) The reaction raw material Cs 2 CO 3 、 Bi 2 o 3 and Fe(NO 3 ) 3 Add water according to the molar ratio of 1:1:2, and stir evenly on a magnetic stirrer;

[0036] 2) Add KOH solid directly to the above mixed solution to make the alkalinity of the solution reach more than 5mol / L, and mix the mixture evenly under continuous stirring;

[0037] 3) After the above mixture is cooled to room temperature, transfer it to a reactor with a filling degree of less than 80%, react in a 393-533K oven for 1-7 days, then cool the reactor to room temperature, and release the pressure;

[0038] 4) The synthesized sample was washed with deionized water and sonicated in an ultrasonic oscillator to obtain a black sample, and finally the sample was dried in an oven at 60°C.

Embodiment 3

[0040] Preparation of KBiCo in the above single-phase multiferroic materials 2 o 5 The hydrothermal synthesis method, specifically:

[0041] 5) The reaction raw material Bi(NO 3 ) 2 and Co(NO 3 ) 2 Both were made into a clear solution, and the solution was taken according to the molar ratio of 1:2, and stirred evenly on a magnetic stirrer;

[0042] 6) Add KOH solid directly to the above mixed solution to make the alkalinity of the solution reach more than 5mol / L, and mix the mixture evenly under continuous stirring;

[0043] 7) After the above mixture is cooled to room temperature, transfer it to a reactor with a filling degree of less than 80%, react in a 393-533K oven for 1-7 days, then cool the reactor to room temperature, and release the pressure;

[0044] 8) The synthesized sample was washed with deionized water and sonicated in an ultrasonic oscillator to obtain a black sample, and finally the sample was dried in an oven at 60°C.

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Abstract

The invention discloses a laminated single-phase multi-ferric material. The general formula of the material is ABM2O5, wherein A is one or more of Na, K, Rb and Cs; B is one or more of Bi and Pb; and M is one or more of Mn, Fe, Co, Ni and Cu. The invention further provides a hydrothermal preparation method and a high-temperature solid-phase preparation method of the multi-ferric material. The material is a newfound laminated structural material with a non-perovskite structure. In the structure of the material, G-type antiferromagnetic spin alignment is formed under the interaction of tetra-coordinated M ions, so that spinning inclination is facilitated to generate a net magnetic moment; and 6s2 lone pair electrons of A (Bi<3+> and Pb<2+>) ions are a source which keeps a sample be in a ferroelectric state. The multi-ferric material has wide application prospects in the aspects of information storage, spinning devices and sensors.

Description

technical field [0001] The invention relates to a class of layered single-phase multiferroic materials and a method for preparing the materials. Background technique [0002] Multiferroic materials are a class of materials that exhibit both magnetic and electrical ordering at critical temperatures, and have attracted much attention due to their potential applications in information storage, spin devices, and sensors. So far, the types of single-phase multiferroic materials are still very scarce. Among known multiferroic materials, BiFeO 3 It is one of the most concerned multiferroic materials, mainly because of its high ferroelectric order and magnetic order transition temperature (T C e =1123K,T N m = 643K). From a technical point of view, the magnetoelectric coupling temperature above room temperature is a crucial factor for the practical application of the material. However, so far, only a handful of room-temperature multiferroic materials have been discovered, and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G53/04C01G51/04C01G49/00C01G45/12
Inventor 林建华张刚华李国宝黄富强
Owner PEKING UNIV
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